I get for example name=carl from the url in FooStatic and want to initiate the $Name with Carl so I can use it from another function. Can I do that? Or is there some other better way to do that?
class Foo {
private static $Name = "name";
public static function FooStatic(){
if (isset($_GET["name"])){
self::$Name = $_GET["name"];
return true;
} else {
return false;
}
}
I am using the name to get more info from another class
public static function getSomething() {
if (isset($_GET[self::$Name])) {
$name = $_GET[self::$Name];
$ret = $someClass->Foo($name);
return $ret;
}
}
The GET-variables are global, so you can always get them from virtually anywhere (if it is in the same span of the execution) if that's what you are asking.
Related
I want to declare a variable inside a class with an unknown name
class Example {
function newVar($name, $value) {
$this->$name = $value;
}
}
And I want to use it that way
$c = new Example();
$c->newVar('MyVariableName', "This is my Value");
echo($c->MyVariableName);
The Important thing is, that I do not know the name of the variable. So I cannot put a public $MyVariable inside the class.
Is that in anyway possible? and if yes, can i do this with different scopes (private, protected, public) ?
U should use magic methods __get and __set (example without checking):
class Example {
private $data = [];
function newVar($name, $value) {
$this->data[$name] = $value;
}
public function __get($property) {
return $this->data[$property];
}
public function __set($property, $value) {
$this->data[$property] = $value;
}
}
$c = new Example();
$c->newVar('MyVariableName', "This is my Value");
echo($c->MyVariableName);
// This is my Value
$c->MyVariableName = "New value";
echo($c->MyVariableName);
// New value
See http://php.net/manual/en/language.oop5.magic.php
If i am understanding this correctly you can tweak a little bit by using key value array
class Example {
private $temp;
function __construct(){
$this->temp = array();
}
function newVar($name, $value) {
$this->temp[$name] = $value;
}
function getVar($name){
return $this->temp[$name];
}
}
$c = new Example();
$c->newVar('MyVariableName', "This is my Value");
echo($c->getVar('MyVariableName'));
Instead of using private you can use protected as well.
Your looking for magic calling. In PHP you can use the __call() function to do stuff like that. Have a look here: http://www.garfieldtech.com/blog/magical-php-call
Off the top of my head, something like
function __call($vari, $args){
if(isset($this->$vari){
$return = $this->$vari;
}else{
$return = "Nothing set with that name";
}
}
This will also work for private, protected and public. Can also use it to call methods as required in a class
I was wondering if you could get the class name and property name from a property reference in PHP?
class Test {
public static $TestProp;
}
GetDoc(& Test::$TestProp);
function GetDoc($prop) {
$className = getClassName($prop);
$propertyName = getPropertyName($prop);
}
what I'm looking for is if it is possible to create the functions getClassName and getPropertyName?
What you want is basically not possible; a property doesn't know its parent structure.
The only sane thing I could think of is to use reflection for it:
class Test
{
public static $TestProp = '123';
}
//GetDoc(& Test::$TestProp);
GetDoc('Test', 'TestProp');
function GetDoc($className, $propName)
{
$rc = new ReflectionClass($className);
$propValue = $rc->getStaticPropertyValue($propName);
}
Within the Test class you could use __CLASS__ as a convenient reference for the class name.
I have figured out the way to get this to work there is a lot of magic that goes on just to get this to work, but in my case it's worth it.
class Test {
private $props = array();
function __get($name) {
return new Property(get_called_class(), $name, $this->props[$name]);
}
function __set($name, $value) {
$props[$name] = $value;
}
}
class Property {
public $name;
public $class;
public $value;
function __construct($class, $name, $value) {
$this->name = $name;
$this->class = $class;
$this->value = $value;
}
function __toString() {
return $value.'';
}
}
function GetClassByProperty($prop) {
return $prop->class.'->'.$prop->name;
}
$t = new Test();
$t->Name = "Test";
echo GetClassByProperty($t->Name);
this example yes I know it's complex, but it does the job how I'd want it to, will print out "Test->Name" I can also get the value by saying $prop->value. If I want to compare the value to another object I can simply do this:
if($t->Name == "Test") { echo "It worked!!"; }
hope this isn't too confusing but it was a fun exploration into PHP.
Php have a build in function called get_class
How can I figure out in what class a reference to a variable was initiated (and currently exists)?
Example:
<?php
class MyClass {
public $array = array(
"this",
"is",
"an",
"array"
);
}
$class = new MyClass();
$arrayReference = &$class->array;
GetClassForVariable($arrayReference); //Should return "MyClass"
?>
My best bet is some kind of Reflection, but I haven't found any functions that seem suitable for this.
Edit:
A better suited example for what I want is the following:
<?php
class API_Module {
public $module;
public $name;
private $methods = array();
public function __construct($module, $name) {
$this->module = $module;
$this->name = $name;
$this->methods["login"] = new API_Method($this, "login", "Login");
}
public function GetMethod($method) {
return $this->methods[$method];
}
public function GetURL() {
return $this->module; //Should return "session"
}
}
class API_Method {
public $method;
public $name;
private $parentReference;
private $variables = array();
public function __construct(&$parentReference, $method, $name) {
$this->parentReference = $parentReference;
$this->method = $method;
$this->name = $name;
$this->variables["myvar"] = new API_Variable($this, "myvar");
}
public function GetURL() {
return $this->GetParentURL() . "/" . $this->method; //Should return "session/login"
}
public function GetVariable($variableName) {
return $this->variables[$variableName];
}
private function GetParentURL() {
// Need to reference the class parent here
return $this->parentReference->GetURL();
}
}
class API_Variable {
public $name;
private $parentReference;
public function __construct(&$parentReference, $name) {
$this->parentReference = $parentReference;
$this->name = $name;
}
public function GetURL() {
return $this->GetParentURL() . "/" . $this->name; //Should return "session/login/myvar"
}
private function GetParentURL() {
// Need to reference the class parent here
return $this->parentReference->GetURL();
}
}
$sessionModule = new API_Module("session", "Session");
var_dump($sessionModule->GetMethod("login")->GetVariable("myvar")->GetURL()); //Should return "session/login/myvar"
?>
Now, this works fine, but I'd love to be able to do this without using $parentReference in every single subvariable. It might not be possible, but I'd love to know whether it is or not.
For your example:
$class = new MyClass();
$arrayReference = &$class->array;
GetClassForVariable($arrayReference); //Should return "MyClass"
to find out to which variable originally the alias $arrayReference refers to is not possible in PHP. There is no function available resolving the aliases.
Additionally $class->array is just a variable on it's own. So you would also need to find out based on a value in which class it was defined. That is not possible as well, similar to that PHP does not offer anything to resolve a variable alias, it also does not offer anything to learn about the definition of a variable.
So in short PHP does not have a ReflectionVariable class available ;) I wonder if it is even possible.
The get_class() function should work:
http://php.net/manual/en/function.get-class.php
I agree with GRoNGoR that you shouldn't need to get the parent class of a property of an instantiated object. You could instead just get the name of the class before accessing the property. For example:
$class = new MyClass();
$parent_class = get_class($class); // returns "MyClass"
$arrayReference = &$class->array;
Not sure why you'd need the parent class of the property when you have the object instance and can easily get the parent class from there.
Can anyone please explain to me why the following code does not set the values on the array as expected? $_SESSION['foo'] stays empty, even after assigning time() and rand(). I've checked, the __get accessor method is actually called when assigning the variables but they aren't stored for one reason or another.
$test = Session::getSession('test');
$test->foo = array();
$test->foo[] = time();
$test->foo['baz'] = rand(1,9);
var_dump($_SESSION);
Using this simple Session wrapper
class Session
{
protected $namespace = null;
public static function getSession($namespace)
{
return new Session($namespace);
}
public static function destroySession($namespace)
{
if(isset($_SESSION[$namespace])) {
unset($_SESSION[$namespace]);
return true;
}
return false;
}
private function __construct($namespace)
{
$this->namespace = $namespace;
if(!isset($_SESSION[$namespace])) {
$_SESSION[$namespace] = null;
}
}
public function &__get($name)
{
return (isset($_SESSION[$this->namespace][$name])) ? $_SESSION[$this->namespace][$name] : null;
}
public function __set($name, $value)
{
$_SESSION[$this->namespace][$name] = $value;
}
}
In case it might be relevant, i'm using php 5.3.6
I 'm not sure if this can be made to work at all.
For one, to return by reference you should add the & operator at the call site as well. I 'm not sure how that might be possible without screwing up the nice syntax you 're trying to achieve.
Also, you cannot return expressions by reference (only variables). So this won't work:
public function &__get($name)
{
return (isset($_SESSION[$this->namespace][$name]))
? $_SESSION[$this->namespace][$name]
: null;
}
At the very least it should be written as
public function &__get($name)
{
$value = isset($_SESSION[$this->namespace][$name])
? $_SESSION[$this->namespace][$name]
: null;
return $value;
}
class Assignation {
private $VVal_1 = 1;
private $VNam_1 = "One";
//....Multiple Items
private $VVal_2000 = 2000; //For Example
private $VNam_2000 = "Two Thousands"; //For Example
private static $Hash = array(); //How to initialize???
private static function Assigning(){
//This function for to assign the array elements (initialize)
global $Hash;
$this->Hash = array(); //to empty Hash variable and not add more data than it should.
$this->Hash[$this->VVal_1] = $this->VNam_1;
//....Multiple Items
$this->Hash[$this->VVal_2000] = $this->VNam_2000;
}
public static function GetVal($Nam) {
$this->Assigning(); //or use self::Assigning(); //I want to avoid this call
if (array_search($Nam, $this->Hash))
return array_search($Nam, $this->Hash);
return -1;//error
}
public static function GetNam($Val) {
$this->Assigning(); //or use self::Assigning(); //I want to avoid this call
if (array_key_exists($Val, $this->Hash))
return $this->Hash[$Val];
return "Error";
}
}
Class Testing {
static $OtherVal = Assignation::GetVal("BLABLA"); //for example
static $OtherNam = Assignation::GetNam(20); //for example
//Other functions...
}
Hi, you can see my script or code php...
I need to initialize the Hash array, this have static word because I need to use it in other static function. And this "other function" need to use it for other static variable...
I need to know how to implement it the right way..
Thanks chep.-.
<?php
echo "pre-Class Assignation<br/>";
class Assignation {
private $VVal_1 = 1;
private $VNam_1 = "One";
private $VVal_2K = 2000;
private $VNam_2K = "Two Thousands";
private static $Hash = array();
private static function Assigning(){
if(!empty(self::$Hash)) return;
self::$Hash[$this->VVal_1] = $this->VNam_1;
self::$Hash[$this->VVal_2K] = $this->VNam_2K;
}
public static function GetVal($Nam) {
self::Assigning();
if (array_search($Nam, self::$Hash)) return array_search($Nam, self::$Hash);
return -1;//error
}
public static function GetNam($Val) {
self::Assigning();
if (array_key_exists($Val, self::$Hash)) return self::$Hash[$Val];
return "Error";
}
}
echo "post-Class Testing<br/>";
echo Assignation::GetVal("BLABLA");
echo "post-Class Mid<br/>";
echo Assignation::GetNam(20);
echo "post-Class Sample<br/>";
//Testing::MyPrint();
?>
This code is not running, somebody help me testing the code...
result:
pre-Class Assignation
post-Class Assignation
post-Class Testing
that mean:
" echo Assignation::GetVal("BLABLA");"
have error...
In Assigning(), try using self::$Hash rather than $this->Hash and remove the global $Hash. Same applies for calling Assigning(): self::Assigning() as your comments suggest.
$this references the current object, so you must use self:: for all static functions and member data when inside the class.
Also, if this is your real code and not just a sample, you may want to check whether you have already done initialization, otherwise you will be doing it for every call to GetVal() and GetNam(). You could do this by adding something like if(!empty(self::$Hash)) return at the beginning of Assigning()
EDIT
private static function Assigning() {
if(!empty(self::$Hash)) return; // already populated
self::$Hash = array();
self::$Hash[$this->VVal_1] = $this->VNam_1;
//....Multiple Items
self::$Hash[$this->VVal_2K] = $this->VNam_2K;
}