Related
Is it possible to chain static methods together using a static class? Say I wanted to do something like this:
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
. . . and obviously I would want $value to be assigned the number 14. Is this possible?
Update: It doesn't work (you can't return "self" - it's not an instance!), but this is where my thoughts have taken me:
class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return self;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return self;
}
public static function result() {
return self::$value;
}
}
After working that out, I think it would just make more sense to simply work with a class instance rather than trying to chain static function calls (which doesn't look possible, unless the above example could be tweaked somehow).
I like the solution provided by Camilo above, essentially since all you're doing is altering the value of a static member, and since you do want chaining (even though it's only syntatic sugar), then instantiating TestClass is probably the best way to go.
I'd suggest a Singleton pattern if you want to restrict instantiation of the class:
class TestClass
{
public static $currentValue;
private static $_instance = null;
private function __construct () { }
public static function getInstance ()
{
if (self::$_instance === null) {
self::$_instance = new self;
}
return self::$_instance;
}
public function toValue($value) {
self::$currentValue = $value;
return $this;
}
public function add($value) {
self::$currentValue = self::$currentValue + $value;
return $this;
}
public function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return $this;
}
public function result() {
return self::$currentValue;
}
}
// Example Usage:
$result = TestClass::getInstance ()
->toValue(5)
->add(3)
->subtract(2)
->add(8)
->result();
class oop{
public static $val;
public static function add($var){
static::$val+=$var;
return new static;
}
public static function sub($var){
static::$val-=$var;
return new static;
}
public static function out(){
return static::$val;
}
public static function init($var){
static::$val=$var;
return new static;
}
}
echo oop::init(5)->add(2)->out();
Little crazy code on php5.3... just for fun.
namespace chaining;
class chain
{
static public function one()
{return get_called_class();}
static public function two()
{return get_called_class();}
}
${${${${chain::one()} = chain::two()}::one()}::two()}::one();
With php7 you will be able to use desired syntax because of new Uniform Variable Syntax
<?php
abstract class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return __CLASS__;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return __CLASS__;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return __CLASS__;
}
public static function result() {
return self::$currentValue;
}
}
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
echo $value;
Demo
If toValue(x) returns an object, you could do like this:
$value = TestClass::toValue(5)->add(3)->substract(2)->add(8);
Providing that toValue returns a new instance of the object, and each next method mutates it, returning an instance of $this.
This is more accurate, easier, and read-friendly (allows code-completion)
class Calculator
{
public static $value = 0;
protected static $onlyInstance;
protected function __construct ()
{
// disable creation of public instances
}
protected static function getself()
{
if (static::$onlyInstance === null)
{
static::$onlyInstance = new Calculator;
}
return static::$onlyInstance;
}
/**
* add to value
* #param numeric $num
* #return \Calculator
*/
public static function add($num)
{
static::$value += $num;
return static::getself();
}
/**
* substruct
* #param string $num
* #return \Calculator
*/
public static function subtract($num)
{
static::$value -= $num;
return static::getself();
}
/**
* multiple by
* #param string $num
* #return \Calculator
*/
public static function multiple($num)
{
static::$value *= $num;
return static::getself();
}
/**
* devide by
* #param string $num
* #return \Calculator
*/
public static function devide($num)
{
static::$value /= $num;
return static::getself();
}
public static function result()
{
return static::$value;
}
}
Example:
echo Calculator::add(5)
->subtract(2)
->multiple(2.1)
->devide(10)
->result();
result: 0.63
People are overcomplicating this like crazy.
Check this out:
class OopClass
{
public $first;
public $second;
public $third;
public static function make($first)
{
return new OopClass($first);
}
public function __construct($first)
{
$this->first = $first;
}
public function second($second)
{
$this->second = $second;
return $this;
}
public function third($third)
{
$this->third = $third;
return $this;
}
}
Usage:
OopClass::make('Hello')->second('To')->third('World');
You could always use the First method as a static and the remaining as instance methods:
$value = Math::toValue(5)->add(3)->subtract(2)->add(8)->result();
Or better yet:
$value = Math::eval(Math::value(5)->add(3)->subtract(2)->add(8));
class Math {
public $operation;
public $operationValue;
public $args;
public $allOperations = array();
public function __construct($aOperation, $aValue, $theArgs)
{
$this->operation = $aOperation;
$this->operationValue = $aValue;
$this->args = $theArgs;
}
public static function eval($math) {
if(strcasecmp(get_class($math), "Math") == 0){
$newValue = $math->operationValue;
foreach ($math->allOperations as $operationKey=>$currentOperation) {
switch($currentOperation->operation){
case "add":
$newvalue = $currentOperation->operationValue + $currentOperation->args;
break;
case "subtract":
$newvalue = $currentOperation->operationValue - $currentOperation->args;
break;
}
}
return $newValue;
}
return null;
}
public function add($number){
$math = new Math("add", null, $number);
$this->allOperations[count($this->allOperations)] &= $math;
return $this;
}
public function subtract($number){
$math = new Math("subtract", null, $number);
$this->allOperations[count($this->allOperations)] &= $math;
return $this;
}
public static function value($number){
return new Math("value", $number, null);
}
}
Just an FYI.. I wrote this off the top of my head (right here on the site). So, it may not run, but that is the idea. I could have also did a recursive method call to eval, but I thought this may be simpler. Please let me know if you would like me to elaborate or provide any other help.
Technically you can call a static method on an instance like $object::method() in PHP 7+, so returning a new instance should work as a replacement for return self. And indeed it works.
final class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return new static();
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return new static();
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return new static();
}
public static function result() {
return self::$currentValue;
}
}
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
var_dump($value);
Outputs int(14).
This about same as returning __CLASS__ as used in other answer. I rather hope no-one ever decides to actually use these forms of API, but you asked for it.
In a nutshell... no. :) The resolution operator (::) would work for the TetsClass::toValue(5) part, but everything after that will just give a syntax error.
Once namespaces are implemented in 5.3, you can have "chained" :: operators, but all that'll do is drill down through the namespace tree; it won't be possible to have methods in the middle of things like this.
The best that can be done
class S
{
public static function __callStatic($name,$args)
{
echo 'called S::'.$name . '( )<p>';
return '_t';
}
}
$_t='S';
${${S::X()}::F()}::C();
No, this won't work. The :: operator needs to evaluate back to a class, so after the TestClass::toValue(5) evaluates, the ::add(3) method would only be able to evaluate on the answer of the last one.
So if toValue(5) returned the integer 5, you would basically be calling int(5)::add(3) which obviously is an error.
The most easiest way i have ever found for method chaining from new Instance or Static method of class is as below. I have used Late Static Binding here and i really loved this solution.
I have created a utility to send multiple User Notification on next page using tostr in Laravel.
<?php
namespace App\Utils;
use Session;
use Illuminate\Support\HtmlString;
class Toaster
{
private static $options = [
"closeButton" => false,
"debug" => false,
"newestOnTop" => false,
"progressBar" => false,
"positionClass" => "toast-top-right",
"preventDuplicates" => false,
"onclick" => null,
"showDuration" => "3000",
"hideDuration" => "1000",
"timeOut" => "5000",
"extendedTimeOut" => "1000",
"showEasing" => "swing",
"hideEasing" => "linear",
"showMethod" => "fadeIn",
"hideMethod" => "fadeOut"
];
private static $toastType = "success";
private static $instance;
private static $title;
private static $message;
private static $toastTypes = ["success", "info", "warning", "error"];
public function __construct($options = [])
{
self::$options = array_merge(self::$options, $options);
}
public static function setOptions(array $options = [])
{
self::$options = array_merge(self::$options, $options);
return self::getInstance();
}
public static function setOption($option, $value)
{
self::$options[$option] = $value;
return self::getInstance();
}
private static function getInstance()
{
if(empty(self::$instance) || self::$instance === null)
{
self::setInstance();
}
return self::$instance;
}
private static function setInstance()
{
self::$instance = new static();
}
public static function __callStatic($method, $args)
{
if(in_array($method, self::$toastTypes))
{
self::$toastType = $method;
return self::getInstance()->initToast($method, $args);
}
throw new \Exception("Ohh my god. That toast doesn't exists.");
}
public function __call($method, $args)
{
return self::__callStatic($method, $args);
}
private function initToast($method, $params=[])
{
if(count($params)==2)
{
self::$title = $params[0];
self::$message = $params[1];
}
elseif(count($params)==1)
{
self::$title = ucfirst($method);
self::$message = $params[0];
}
$toasters = [];
if(Session::has('toasters'))
{
$toasters = Session::get('toasters');
}
$toast = [
"options" => self::$options,
"type" => self::$toastType,
"title" => self::$title,
"message" => self::$message
];
$toasters[] = $toast;
Session::forget('toasters');
Session::put('toasters', $toasters);
return $this;
}
public static function renderToasters()
{
$toasters = Session::get('toasters');
$string = '';
if(!empty($toasters))
{
$string .= '<script type="application/javascript">';
$string .= "$(function() {\n";
foreach ($toasters as $toast)
{
$string .= "\n toastr.options = " . json_encode($toast['options'], JSON_PRETTY_PRINT) . ";";
$string .= "\n toastr['{$toast['type']}']('{$toast['message']}', '{$toast['title']}');";
}
$string .= "\n});";
$string .= '</script>';
}
Session::forget('toasters');
return new HtmlString($string);
}
}
This will work as below.
Toaster::success("Success Message", "Success Title")
->setOption('showDuration', 5000)
->warning("Warning Message", "Warning Title")
->error("Error Message");
Fully functional example of method chaining with static attributes:
<?php
class Response
{
static protected $headers = [];
static protected $http_code = 200;
static protected $http_code_msg = '';
static protected $instance = NULL;
protected function __construct() { }
static function getInstance(){
if(static::$instance == NULL){
static::$instance = new static();
}
return static::$instance;
}
public function addHeaders(array $headers)
{
static::$headers = $headers;
return static::getInstance();
}
public function addHeader(string $header)
{
static::$headers[] = $header;
return static::getInstance();
}
public function code(int $http_code, string $msg = NULL)
{
static::$http_code_msg = $msg;
static::$http_code = $http_code;
return static::getInstance();
}
public function send($data, int $http_code = NULL){
$http_code = $http_code != NULL ? $http_code : static::$http_code;
if ($http_code != NULL)
header(trim("HTTP/1.0 ".$http_code.' '.static::$http_code_msg));
if (is_array($data) || is_object($data))
$data = json_encode($data);
echo $data;
exit();
}
function sendError(string $msg_error, int $http_code = null){
$this->send(['error' => $msg_error], $http_code);
}
}
Example of use:
Response::getInstance()->code(400)->sendError("Lacks id in request");
Here's another way without going through a getInstance method (tested on PHP 7.x):
class TestClass
{
private $result = 0;
public function __call($method, $args)
{
return $this->call($method, $args);
}
public static function __callStatic($method, $args)
{
return (new static())->call($method, $args);
}
private function call($method, $args)
{
if (! method_exists($this , '_' . $method)) {
throw new Exception('Call undefined method ' . $method);
}
return $this->{'_' . $method}(...$args);
}
private function _add($num)
{
$this->result += $num;
return $this;
}
private function _subtract($num)
{
$this->result -= $num;
return $this;
}
public function result()
{
return $this->result;
}
}
The class can be used as following:
$res1 = TestClass::add(5)
->add(3)
->subtract(2)
->add(8)
->result();
echo $res1 . PHP_EOL; // 14
$res2 = TestClass::subtract(1)->add(10)->result();
echo $res2 . PHP_EOL; // 9
Also works as:
ExampleClass::withBanners()->withoutTranslations()->collection($values)
Using new static(self::class);
public static function withoutTranslations(): self
{
self::$withoutTranslations = true;
return new static(self::class);
}
public static function withBanners(): self
{
return new static(self::class);
}
public static function collection(values): self
{
return $values;
}
Use PHP 7! If your web provider cannot --> change provider! Don't lock in past.
final class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return __CLASS__;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return __CLASS__;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return __CLASS__;
}
public static function result() {
return self::$currentValue;
}
}
And very simple use:
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
var_dump($value);
Return (or throw error):
int(14)
completed contract.
Rule one: most evolved and maintainable is always better.
I have a sample code:
class Assets {
public static $my_static = '';
public static function custom_js()
{
return self::add_custom_js();
}
public static function add_custom_js($str)
{
return self::$my_static = $str;
}
}
And php
<?php
Assets::add_custom_js("ABC");
?>
<html>
...
<?php echo Assets::custom_js(); ?>
...
</html>
Error can't show data string is "ABC"
I think you want to return $my_static value to get ABC in echo Assets::custom_js();. Consider following:
class Assets {
public static $my_static = '';
public static function custom_js()
{
// return self::add_custom_js();
return self::$my_static; //This is what you want i believe
}
public static function add_custom_js($str)
{
return self::$my_static = $str;
}
}
You have to return $my_static from custom_js() so Your class should be as follow:
<?php
class Assets {
public static $my_static = '';
public static function custom_js()
{
return self::$my_static; //<-------------change this line
}
public static function add_custom_js($str="")
{
return self::$my_static = $str;
}
}
?>
Is it possible to chain static methods together using a static class? Say I wanted to do something like this:
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
. . . and obviously I would want $value to be assigned the number 14. Is this possible?
Update: It doesn't work (you can't return "self" - it's not an instance!), but this is where my thoughts have taken me:
class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return self;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return self;
}
public static function result() {
return self::$value;
}
}
After working that out, I think it would just make more sense to simply work with a class instance rather than trying to chain static function calls (which doesn't look possible, unless the above example could be tweaked somehow).
I like the solution provided by Camilo above, essentially since all you're doing is altering the value of a static member, and since you do want chaining (even though it's only syntatic sugar), then instantiating TestClass is probably the best way to go.
I'd suggest a Singleton pattern if you want to restrict instantiation of the class:
class TestClass
{
public static $currentValue;
private static $_instance = null;
private function __construct () { }
public static function getInstance ()
{
if (self::$_instance === null) {
self::$_instance = new self;
}
return self::$_instance;
}
public function toValue($value) {
self::$currentValue = $value;
return $this;
}
public function add($value) {
self::$currentValue = self::$currentValue + $value;
return $this;
}
public function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return $this;
}
public function result() {
return self::$currentValue;
}
}
// Example Usage:
$result = TestClass::getInstance ()
->toValue(5)
->add(3)
->subtract(2)
->add(8)
->result();
class oop{
public static $val;
public static function add($var){
static::$val+=$var;
return new static;
}
public static function sub($var){
static::$val-=$var;
return new static;
}
public static function out(){
return static::$val;
}
public static function init($var){
static::$val=$var;
return new static;
}
}
echo oop::init(5)->add(2)->out();
Little crazy code on php5.3... just for fun.
namespace chaining;
class chain
{
static public function one()
{return get_called_class();}
static public function two()
{return get_called_class();}
}
${${${${chain::one()} = chain::two()}::one()}::two()}::one();
With php7 you will be able to use desired syntax because of new Uniform Variable Syntax
<?php
abstract class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return __CLASS__;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return __CLASS__;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return __CLASS__;
}
public static function result() {
return self::$currentValue;
}
}
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
echo $value;
Demo
If toValue(x) returns an object, you could do like this:
$value = TestClass::toValue(5)->add(3)->substract(2)->add(8);
Providing that toValue returns a new instance of the object, and each next method mutates it, returning an instance of $this.
This is more accurate, easier, and read-friendly (allows code-completion)
class Calculator
{
public static $value = 0;
protected static $onlyInstance;
protected function __construct ()
{
// disable creation of public instances
}
protected static function getself()
{
if (static::$onlyInstance === null)
{
static::$onlyInstance = new Calculator;
}
return static::$onlyInstance;
}
/**
* add to value
* #param numeric $num
* #return \Calculator
*/
public static function add($num)
{
static::$value += $num;
return static::getself();
}
/**
* substruct
* #param string $num
* #return \Calculator
*/
public static function subtract($num)
{
static::$value -= $num;
return static::getself();
}
/**
* multiple by
* #param string $num
* #return \Calculator
*/
public static function multiple($num)
{
static::$value *= $num;
return static::getself();
}
/**
* devide by
* #param string $num
* #return \Calculator
*/
public static function devide($num)
{
static::$value /= $num;
return static::getself();
}
public static function result()
{
return static::$value;
}
}
Example:
echo Calculator::add(5)
->subtract(2)
->multiple(2.1)
->devide(10)
->result();
result: 0.63
People are overcomplicating this like crazy.
Check this out:
class OopClass
{
public $first;
public $second;
public $third;
public static function make($first)
{
return new OopClass($first);
}
public function __construct($first)
{
$this->first = $first;
}
public function second($second)
{
$this->second = $second;
return $this;
}
public function third($third)
{
$this->third = $third;
return $this;
}
}
Usage:
OopClass::make('Hello')->second('To')->third('World');
You could always use the First method as a static and the remaining as instance methods:
$value = Math::toValue(5)->add(3)->subtract(2)->add(8)->result();
Or better yet:
$value = Math::eval(Math::value(5)->add(3)->subtract(2)->add(8));
class Math {
public $operation;
public $operationValue;
public $args;
public $allOperations = array();
public function __construct($aOperation, $aValue, $theArgs)
{
$this->operation = $aOperation;
$this->operationValue = $aValue;
$this->args = $theArgs;
}
public static function eval($math) {
if(strcasecmp(get_class($math), "Math") == 0){
$newValue = $math->operationValue;
foreach ($math->allOperations as $operationKey=>$currentOperation) {
switch($currentOperation->operation){
case "add":
$newvalue = $currentOperation->operationValue + $currentOperation->args;
break;
case "subtract":
$newvalue = $currentOperation->operationValue - $currentOperation->args;
break;
}
}
return $newValue;
}
return null;
}
public function add($number){
$math = new Math("add", null, $number);
$this->allOperations[count($this->allOperations)] &= $math;
return $this;
}
public function subtract($number){
$math = new Math("subtract", null, $number);
$this->allOperations[count($this->allOperations)] &= $math;
return $this;
}
public static function value($number){
return new Math("value", $number, null);
}
}
Just an FYI.. I wrote this off the top of my head (right here on the site). So, it may not run, but that is the idea. I could have also did a recursive method call to eval, but I thought this may be simpler. Please let me know if you would like me to elaborate or provide any other help.
Technically you can call a static method on an instance like $object::method() in PHP 7+, so returning a new instance should work as a replacement for return self. And indeed it works.
final class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return new static();
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return new static();
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return new static();
}
public static function result() {
return self::$currentValue;
}
}
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
var_dump($value);
Outputs int(14).
This about same as returning __CLASS__ as used in other answer. I rather hope no-one ever decides to actually use these forms of API, but you asked for it.
In a nutshell... no. :) The resolution operator (::) would work for the TetsClass::toValue(5) part, but everything after that will just give a syntax error.
Once namespaces are implemented in 5.3, you can have "chained" :: operators, but all that'll do is drill down through the namespace tree; it won't be possible to have methods in the middle of things like this.
The best that can be done
class S
{
public static function __callStatic($name,$args)
{
echo 'called S::'.$name . '( )<p>';
return '_t';
}
}
$_t='S';
${${S::X()}::F()}::C();
No, this won't work. The :: operator needs to evaluate back to a class, so after the TestClass::toValue(5) evaluates, the ::add(3) method would only be able to evaluate on the answer of the last one.
So if toValue(5) returned the integer 5, you would basically be calling int(5)::add(3) which obviously is an error.
The most easiest way i have ever found for method chaining from new Instance or Static method of class is as below. I have used Late Static Binding here and i really loved this solution.
I have created a utility to send multiple User Notification on next page using tostr in Laravel.
<?php
namespace App\Utils;
use Session;
use Illuminate\Support\HtmlString;
class Toaster
{
private static $options = [
"closeButton" => false,
"debug" => false,
"newestOnTop" => false,
"progressBar" => false,
"positionClass" => "toast-top-right",
"preventDuplicates" => false,
"onclick" => null,
"showDuration" => "3000",
"hideDuration" => "1000",
"timeOut" => "5000",
"extendedTimeOut" => "1000",
"showEasing" => "swing",
"hideEasing" => "linear",
"showMethod" => "fadeIn",
"hideMethod" => "fadeOut"
];
private static $toastType = "success";
private static $instance;
private static $title;
private static $message;
private static $toastTypes = ["success", "info", "warning", "error"];
public function __construct($options = [])
{
self::$options = array_merge(self::$options, $options);
}
public static function setOptions(array $options = [])
{
self::$options = array_merge(self::$options, $options);
return self::getInstance();
}
public static function setOption($option, $value)
{
self::$options[$option] = $value;
return self::getInstance();
}
private static function getInstance()
{
if(empty(self::$instance) || self::$instance === null)
{
self::setInstance();
}
return self::$instance;
}
private static function setInstance()
{
self::$instance = new static();
}
public static function __callStatic($method, $args)
{
if(in_array($method, self::$toastTypes))
{
self::$toastType = $method;
return self::getInstance()->initToast($method, $args);
}
throw new \Exception("Ohh my god. That toast doesn't exists.");
}
public function __call($method, $args)
{
return self::__callStatic($method, $args);
}
private function initToast($method, $params=[])
{
if(count($params)==2)
{
self::$title = $params[0];
self::$message = $params[1];
}
elseif(count($params)==1)
{
self::$title = ucfirst($method);
self::$message = $params[0];
}
$toasters = [];
if(Session::has('toasters'))
{
$toasters = Session::get('toasters');
}
$toast = [
"options" => self::$options,
"type" => self::$toastType,
"title" => self::$title,
"message" => self::$message
];
$toasters[] = $toast;
Session::forget('toasters');
Session::put('toasters', $toasters);
return $this;
}
public static function renderToasters()
{
$toasters = Session::get('toasters');
$string = '';
if(!empty($toasters))
{
$string .= '<script type="application/javascript">';
$string .= "$(function() {\n";
foreach ($toasters as $toast)
{
$string .= "\n toastr.options = " . json_encode($toast['options'], JSON_PRETTY_PRINT) . ";";
$string .= "\n toastr['{$toast['type']}']('{$toast['message']}', '{$toast['title']}');";
}
$string .= "\n});";
$string .= '</script>';
}
Session::forget('toasters');
return new HtmlString($string);
}
}
This will work as below.
Toaster::success("Success Message", "Success Title")
->setOption('showDuration', 5000)
->warning("Warning Message", "Warning Title")
->error("Error Message");
Fully functional example of method chaining with static attributes:
<?php
class Response
{
static protected $headers = [];
static protected $http_code = 200;
static protected $http_code_msg = '';
static protected $instance = NULL;
protected function __construct() { }
static function getInstance(){
if(static::$instance == NULL){
static::$instance = new static();
}
return static::$instance;
}
public function addHeaders(array $headers)
{
static::$headers = $headers;
return static::getInstance();
}
public function addHeader(string $header)
{
static::$headers[] = $header;
return static::getInstance();
}
public function code(int $http_code, string $msg = NULL)
{
static::$http_code_msg = $msg;
static::$http_code = $http_code;
return static::getInstance();
}
public function send($data, int $http_code = NULL){
$http_code = $http_code != NULL ? $http_code : static::$http_code;
if ($http_code != NULL)
header(trim("HTTP/1.0 ".$http_code.' '.static::$http_code_msg));
if (is_array($data) || is_object($data))
$data = json_encode($data);
echo $data;
exit();
}
function sendError(string $msg_error, int $http_code = null){
$this->send(['error' => $msg_error], $http_code);
}
}
Example of use:
Response::getInstance()->code(400)->sendError("Lacks id in request");
Here's another way without going through a getInstance method (tested on PHP 7.x):
class TestClass
{
private $result = 0;
public function __call($method, $args)
{
return $this->call($method, $args);
}
public static function __callStatic($method, $args)
{
return (new static())->call($method, $args);
}
private function call($method, $args)
{
if (! method_exists($this , '_' . $method)) {
throw new Exception('Call undefined method ' . $method);
}
return $this->{'_' . $method}(...$args);
}
private function _add($num)
{
$this->result += $num;
return $this;
}
private function _subtract($num)
{
$this->result -= $num;
return $this;
}
public function result()
{
return $this->result;
}
}
The class can be used as following:
$res1 = TestClass::add(5)
->add(3)
->subtract(2)
->add(8)
->result();
echo $res1 . PHP_EOL; // 14
$res2 = TestClass::subtract(1)->add(10)->result();
echo $res2 . PHP_EOL; // 9
Also works as:
ExampleClass::withBanners()->withoutTranslations()->collection($values)
Using new static(self::class);
public static function withoutTranslations(): self
{
self::$withoutTranslations = true;
return new static(self::class);
}
public static function withBanners(): self
{
return new static(self::class);
}
public static function collection(values): self
{
return $values;
}
Use PHP 7! If your web provider cannot --> change provider! Don't lock in past.
final class TestClass {
public static $currentValue;
public static function toValue($value) {
self::$currentValue = $value;
return __CLASS__;
}
public static function add($value) {
self::$currentValue = self::$currentValue + $value;
return __CLASS__;
}
public static function subtract($value) {
self::$currentValue = self::$currentValue - $value;
return __CLASS__;
}
public static function result() {
return self::$currentValue;
}
}
And very simple use:
$value = TestClass::toValue(5)::add(3)::subtract(2)::add(8)::result();
var_dump($value);
Return (or throw error):
int(14)
completed contract.
Rule one: most evolved and maintainable is always better.
I am getting this message on going to several pages:
Warning: session_start(): Function spl_autoload_call() hasn't defined the class it was called for in /var/www/library/session/session.php on line 18
This is the file that is creating the calls:
<?php
namespace iX\session;
class session{
private static $instance;
private static $init=false;
private static function doFirstInit(){
ini_set('session.name', \iX\config::get('system')->session->name);
ini_set('session.cookie_lifetime', \iX\config::get('system')->session->cookie->lifetime);
ini_set('session.cookie_path', \iX\config::get('system')->session->cookie->path);
ini_set('session.cookie_domain', \iX\config::get('system')->domain->name);
ini_set('session.use_cookies', ((\iX\config::get('system')->session->cookie->use)?'1':0));
ini_set('session.use_only_cookies', ((\iX\config::get('system')->session->cookie->onlyCookies)?'1':0));
\iX\core::load('library/session/interface.php');
\iX\core::load('library/session/handler/'. \iX\config::get('system')->session->handler.'.php');
$class = '\iX\session\handler_'.\iX\config::get('system')->session->handler;
$class::getInstance();
session_start();
self::$init = true;
}
public static function getInstance(){
if(!self::$init)
self::doFirstInit();
if(!(self::$instance instanceof session))
self::$instance = new session('main');
return self::$instance;
}
private $handler=array();
public function __construct($handler){
$this->handler = &$_SESSION[$handler];
if(!isset($this->handler['userid']))
$this->handler['userid'] = 1;
if($this->handler['userid']==0)
$this->handler['userid'] = 1;
if(!isset($this->handler['counter']))
$this->handler['counter'] = 0;
if(!isset($this->handler['login']))
$this->handler['login'] = false;
if(!isset($this->handler['numpages']))
$this->handler['numpages'] = 0;
if(!isset($this->handler['lock']))
$this->handler['lock'] = false;
}
public function __get($name){
$this->handler['counter']++;
return (!isset($this->handler[$name]))?false:$this->handler[$name];
}
public function __set($name,$value){
if($this->lock==false){
$this->handler[$name]=$value;
return true;
}else return false;
}
public function __isset($id){
if(isset($this->handler[$id]) && $this->handler[$id]!=null) return true;
return false;
}
public function __unset($id){
$this->handler[$id] = null;
return true;
}
private function __cleanup(){
$this->handler = array();
}
public function getPages(){
return $this->numpages;
}
public function setIncreasePage(){
$this->numpages++;
}
public function Login($uid){
$this->login=true;
$this->userid = intval($uid);
$this->userId = intval($uid);
}
public function setLogout(){
foreach($this as $key=>$value)
$this->{$key} = null;
$this->role = "guest";
$this->userId = 0;
$this->login=false;
}
public function isLogin(){
return $this->login;
}
public function isRlogin(){
return ($this->rActive == true && isset($this->rLogin))?true:false;
}
public function cleanup(){
$this->__cleanup();
}
public function put(){
}
public function lock(){
$this->lock = true;
}
public function unlock(){
$this->lock = false;
}
public function get_stat(){
return $this->lock;
}
public function rewind() {
reset($this->handler);
}
public function current() {
$var = current($this->handler);
return $var;
}
public function key() {
$var = key($this->handler);
return $var;
}
public function next() {
$var = next($this->handler);
return $var;
}
public function valid() {
$var = $this->current() !== false;
return $var;
}
public function __toString(){
$return = '';
foreach($this->handler as $key=>$value)
$return .= $key.':'.$value."\n";
return $return;
}
public function __toArray(){
return $this->handler;
}
public function toString(){
return $this->__toString();
}
public function toArray(){
return $this->__toArray();
}
public function getSession(){
return $this->handler;
}
public function restoreSession($session){
$session = unserialize($session);
if(is_array($session))
$this->handler = $session;
}
}
How can I get rid of this Warning. I don't just want to disable the warning calls. I want to have a clean app.
Please somebody enlight me.
Chris
Try this:
<?php
session_start();
// ...
and the best solution will be:
in index.php.
class Contact{
public $name;
public $bgcolor;
public $lgcolor;
public $email;
public $element;
public function __construct($name, $bgcolor, $lgcolor, $email, $element)
{
$this->name = $name;
$this->bgcolor = $bgcolor;
$this->lgcolor = $lgcolor;
$this->email = $email;
$this->element = $element;
}
public static function sortByName(Contact $p1, Contact $p2)
{
return strcmp($p1->name, $p2->name);
}
}
class ContactList implements Iterator, ArrayAccess
{
protected $_label;
protected $_contacts = array();
public function __construct($label)
{
$this->_label = $label;
}
public function getLabel()
{
return $this->_label;
}
public function addContact(Contact $contact)
{
$this->_contacts[] = $contact;
}
public function current()
{
return current($this->_contacts);
}
public function key()
{
return key($this->_contacts);
}
public function next()
{
return next($this->_contacts);
}
public function rewind()
{
return reset($this->_contacts);
}
public function valid()
{
return current($this->_contacts);
}
public function offsetGet($offset)
{
return $this->_contacts[$offset];
}
public function offsetSet($offset, $data)
{
if (!$data instanceof Contact)
throw new InvalidArgumentException('Only Contact objects allowed in a ContactList');
if ($offset == '')
{
$this->_contacts[] = $data;
} else
{
$this->_contacts[$offset] = $data;
}
}
public function offsetUnset($offset)
{
unset($this->_contacts[$offset]);
}
public function offsetExists($offset) {
return isset($this->_contacts[$offset]);
}
public function sort($attribute = 'name')
{
$sortFct = 'sortBy' . ucfirst(strtolower($attribute));
if (!in_array($sortFct, get_class_methods('Contact')))
{
throw new Exception('contact->sort(): Can\'t sort by ' . $attribute);
}
usort($this->contact, 'ContactList::' . $sortFct);
}
}
public function Sort($property, $asc=true)
{
// this is where sorting logic takes place
$_pd = $this->_contact->getProperty($property);
if ($_pd == null)
{
user_error('Property '.$property.' does not exist in class '.$this->_contact->getName(), E_WARNING);
return;
}
// set sortDescriptor
ContactList::$sortProperty = $_pd;
// and apply sorting
usort($this->_array, array('ContactList', ($asc?'USortAsc':'USortDesc')));
}
function getItems(){
return $this->_array;
}
class SortableItem extends ContactList
{
static public $sortProperty;
static function USortAsc($a, $b)
{
/*#var $_pd ReflectionProperty*/
/*
$_pd = self::$sortProperty;
if ($_pd !== null)
{
if ($_pd->getValue($a) === $_pd->getValue($b))
return 0;
else
return (($_pd->getValue($a) < $_pd->getValue($b))?-1:1);
}
return 0;
}
static function USortDesc($a, $b)
{
return -(self::USortAsc($a,$b));
}
}
This approach keeps giving me PHP Warnings: usort() [function.usort]: of all kinds which I can provide later as needed to comment out those methods and definitions in order to test and fix some minor bugs of our program.
**$billy parameters are already defined.
$all -> addContact($billy);
// --> ended up adding each contact manually above
$all->Sort('name',true);
$items = $all->getItems();
foreach($items as $contact)
{
echo $contact->__toString();
}
$all->sort();
The reason for using usort is to re-arrange the order alphabetically by name but somehow is either stating that the function comparison needs to be an array or another errors which obviously I have seemed to pass. Any help would be greatly appreciated, thanks in advance.
It's happening because the variable inside the usort call is not a valid array. You use $this->_contacts everywhere, but your usort line is:
usort($this->contact, 'ContactList::' . $sortFct);
Try changing that to:
usort($this->_contacts, 'ContactList::' . $sortFct);
<?php
class Contact{
public $name;
public $bgcolor;
public $lgcolor;
public $email;
public $element;
public function __construct($name, $bgcolor, $lgcolor, $email, $element)
{
$this->name = $name;
$this->bgcolor = $bgcolor;
$this->lgcolor = $lgcolor;
$this->email = $email;
$this->element = $element;
}
}
class ContactList implements Iterator, ArrayAccess
{
public $_label;
public $_contacts = array();
public function __construct($label)
{
$this->_label = $label;
}
public function getLabel()
{
return $this->_label;
}
public function addContact(Contact $contact)
{
$this->_contacts[] = $contact;
}
public function current()
{
return current($this->_contacts);
}
public function key()
{
return key($this->_contacts);
}
public function next()
{
return next($this->_contacts);
}
public function rewind()
{
return reset($this->_contacts);
}
public function valid()
{
return current($this->_contacts);
}
public function offsetGet($offset)
{
return $this->_contacts[$offset];
}
public function offsetSet($offset, $data)
{
if (!$data instanceof Contact)
throw new InvalidArgumentException('Only Contact objects allowed in a ContactList');
if ($offset == '')
{
$this->_contacts[] = $data;
} else
{
$this->_contacts[$offset] = $data;
}
}
public function offsetUnset($offset)
{
unset($this->_contacts[$offset]);
}
public function offsetExists($offset) {
return isset($this->_contacts[$offset]);
}
/* This is the comparing function to be used with usort to make it alphabetically ordered for All Contacts */
public function sort_by($field, &$arr, $sorting='SORT_DSC', $case_insensitive=true){
if(is_array($arr) && (count($arr)>0) && ( ( is_array($arr[0]) && isset($arr[0][$field]) ) || ( is_object($arr[0]) && isset($arr[0]->$field) ) ) ){
if($case_insensitive==true) $strcmp_fn = "strnatcasecmp";
else $strcmp_fn = "strnatcmp";
if($sorting=='SORT_DSC'){
$fn = create_function('$a,$b', '
if(is_object($a) && is_object($b)){
return '.$strcmp_fn.'($a->'.$field.', $b->'.$field.');
}else if(is_array($a) && is_array($b)){
return '.$strcmp_fn.'($a["'.$field.'"], $b["'.$field.'"]);
}else return 0;
');
}else if($sorting=='SORT_ASC'){
$fn = create_function('$a,$b', '
if(is_object($a) && is_object($b)){
return '.$strcmp_fn.'($b->'.$field.', $a->'.$field.');
}else if(is_array($a) && is_array($b)){
return '.$strcmp_fn.'($b["'.$field.'"], $a["'.$field.'"]);
}else return 0;
');
}
usort($arr, $fn);
return true;
}else{
return false;
}
}
}
?
The call:
$all->sort_by('name',$all->_contacts,'SORT_DSC','false');