I don't know if I have seriously misunderstood concept of OOP or I am implementing it wrong here. Can please somebody explain what I am doing wrong here
<?php
class my {
public function myName(){
return get_class($this);
}
public function toArray() {
$retArray=array();
$class_vars = get_object_vars($this);
foreach ($class_vars as $name => $value) {
$retArray[$name]=$value;
}
return $retArray;
}
}
class you extends my {
private $yoo;
public function __construct($var1) {
$this->yoo=$var1;
}
}
$objectYou = new you("I am pri");
echo '<pre>';
echo $objectYou->myName();
echo '<br>';
print_r($objectYou->toArray());
echo '</pre>';
?>
Output is:
you
Array ( )
what I want here is to have super class my which has a function toArray to convert object to array. Now all the classes which extend this class should inherit this function and can use it. but here calling toArray on objectYou is returning empty array. At the same time calling myName on objectYou is showing name of child class.
The only property ($yoo) is private, and thus not accessible from my, where toArray() is defined.
Related
I just want to create function just like getFieldname() that is in magento.
For Ex:
In Magento
getId() - returns value of ID field
getName() - returns value of Name field
How can I create like that function? Kindly help me in this case..
I want to do just Like Below code,
Class Called{
$list=array();
function __construct() {
$this->list["name"]="vivek";
$this->list["id"]="1";
}
function get(){
echo $this->list[$fieldname];
}
}
$instance=new Called();
$instance->getId();
$instance->getName();
You can use the magic method __call to solved your situation
<?php
class Called
{
private $list = array('Id' => 1, 'Name' => 'Vivek Aasaithambi');
public function __call($name, $arguments) {
$field = substr($name, 3);
echo $this->list[$field];
}
}
$obj = new Called();
$obj->getId();
echo "<br/>\n";
$obj->getName();
?>
You can read more about __call in:
http://php.net/manual/en/language.oop5.overloading.php#object.call
Check the implementation of Varien_Object, the __call method is probably what you are looking for, I think. http://freegento.com/doc/de/d24/_object_8php-source.html
This will basically "capture" any non-existing method calls and if they are in the shape $this->getWhateverField, will try to access that property. With minor tweaks should work for your purposes.
See if this is what you want:
Your class should be inherited from another class (Super class) which defines your required methods.
class Super {
public function getId(){
return $this->list["id"];
}
public function getName(){
return $this->list["name"];
}
}
class Called extends Super {
var $list = array();
function __construct() {
$this->list["name"]="vivek";
$this->list["id"]="1";
}
}
$instance=new Called();
echo $instance->getId(); // 1
echo $instance->getName(); //vivek
I'm quite inexperienced with OOP PHP but here's my question...let's say I have this class with one property:
class myClass {
public $property = array();
public function getProperty() {
return $this->property;
}
}
How would it be possible to change the value of $property without altering the class itself in any way, or by instantiating an object out of it, then changing its property. Is there any other way of doing it? Using scope resolution?
Hope that makes sense, any help would be much appreciated.
What you want is a static member
class MyClass {
public static $MyStaticMember = 0;
public function echoStaticMember() {
echo MyClass::$MyStaticMember;
//note you can use self instead of the class name when inside the class
echo self::$MyStaticMember;
}
public function incrementStaticMember() {
self::$MyStaticMember++;
}
}
then you access it like
MyClass::$MyStaticMember = "Some value"; //Note you use the $ with the variable name
Now any instances and everything will see the same value for whatever the static member is set to so take for instance the following
function SomeMethodInAFarFarAwayScript() {
echo MyClass::$MyStaticMember;
}
...
MyClass::$MyStaticMember++; //$MyStaticMember now is: 1
$firstClassInstance = new MyClass();
echo MyClass::$MyStaticMember; //will echo: 1
$firstClassInstance->echoStaticMember(); //will echo: 1
$secondInstance = new MyClass();
$secondInstance->incrementStaticMember(); // $MyStaticMember will now be: 2
echo MyClass::$MyStaticMember; //will echo: 2
$firstClassInstance->echoStaticMember(); //will echo: 2
$secondInstance->echoStaticMember(); //will echo: 2
SomeMethodInAFarFarAwayScript(); //will echo: 2
PHPFiddle
I hope this is what you are looking for
<?php
class myClass {
public $property = array();
public function getProperty() {
print_r($this->property);
}
}
$a = new myClass();
$x = array(10,20);
$a->property=$x; //Setting the value of $x array to $property var on public class
$a->getProperty(); // Prints the array 10,20
EDIT :
As others said , yes you need the variable to be declared as static (if you want to modify the variable without creating new instance of the class or extending it)
<?php
class MyClass {
public static $var = 'A Parent Val';
public function dispData()
{
echo $this->var;
}
}
echo MyClass::$var;//A Parent Val
MyClass::$var="Replaced new var";
echo MyClass::$var;//Replacced new var
?>
Ive got this snippet of code below which works perfectly fine. I have been profiling it and the bit of code gets used alot of times, so I want to try figure out how to write it in a way that will perform better than the current way its written.
Is there a more efficient way to write this?
function objectToArray($d) {
if (is_object($d)) {
// Gets the properties of the given object
// with get_object_vars function
$d = get_object_vars($d);
}
if (is_array($d)) {
// Return array converted to object Using __FUNCTION__ (Magic constant) for recursive call
return array_map(__FUNCTION__, $d);
}
else {
// Return array
return $d;
}
}
You could implement a toArray() method to the class that needs to be converted:
e.g.
class foo
{
protected $property1;
protected $property2;
public function __toArray()
{
return array(
'property1' => $this->property1,
'property2' => $this->property2
);
}
}
Having access to the protected properties and having the whole conversion encapsulated in the class is in my opinion the best way.
Update
One thing to note is that the get_object_vars() function will only return the publically accessible properties - Probably not what you are after.
If the above is too manual of a task the accurate way from outside the class would be to use PHP (SPL) built in ReflectionClass:
$values = array();
$reflectionClass = new \ReflectionClass($object);
foreach($reflectionClass->getProperties() as $property) {
$values[$property->getName()] = $property->getValue($object);
}
var_dump($values);
depends what kind of object it is, many standard php objects have methods built in to convert them
for example MySQLi results can be converted like this
$resultArray = $result->fetch_array(MYSQLI_ASSOC);
if its a custom class object you might consider implementing a method in that class for that purpose as AlexP sugested
Ended up going with:
function objectToArray($d) {
$d = (object) $d;
return $d;
}
function arrayToObject($d) {
$d = (array) $d;
return $d;
}
As AlexP said you can implement a method __toArray(). Alternatively to ReflexionClass (which is complex and expensive), making use of object iteration properties, you can iterate $this as follow
class Foo
{
protected $var1;
protected $var2;
public function __toArray()
{
$result = array();
foreach ($this as $key => $value) {
$result[$key] = $value;
}
return $result;
}
}
This will also iterate object attributes not defined in the class: E.g.
$foo = new Foo;
$foo->var3 = 'asdf';
var_dump($foo->__toArray());)
See example http://3v4l.org/OnVkf
This is the fastest way I have found to convert object to array. Works with Capsule as well.
function objectToArray ($object) {
return json_decode(json_encode($object, JSON_FORCE_OBJECT), true);
}
So there are two things that I am stuck on now. First
class DisplayTaxonomy {
public $MyArray[]= new DisplayTaxonomy(); //the compiler says syntax error
//things I have tried
//public $ss[]= new Object();
}
Second! in a function like this:
public function whatever()
{
$Temp = new DisplayTaxonomy();
$Temp->setADTitle("1");
$MyArray[]= $Temp;//works just fine.
//then i tried to return the array
return $MyArray[];
}
I get the following
//Cannot use [] for reading in C:\xampp\htdocs\wordpress\wp-//content\themes\twentyeleven\page.php on line 52
then in the client side
$y=new DisplayTaxonomy();
$myArray[]=new DisplayTaxonomy();//works fine dont know why I cant do this in theclass.
$myArray[]=$y->getArrayOfDisplayTaxonomyObjects();
echo $myArray[0]->getADTitle();
It seems you want to create a class that handles a collection of Taxonomy objects. In that case you should have two classes, instead of making a class store instances of itself.
class TaxonomyContainer
{
private $collection = array();
public function addElement(DisplayTaxonomy $element)
{
$this->collection[] = $element;
}
public function getElements()
{
return $this->collection;
}
}
class DisplayTaxonomy
{
private $adTitle;
public function setAdTitle($adTitle)
{
$this->adTitle = $adTitle;
}
//and other functionality the Taxonomy object should have
}
Then you can avoid the ugly self replicating behaviour and separate your concerns.
$container = new TaxonomyContainer();
$element = new DisplayTaxonomy();
$container->addElement($element);
On the next level, it might be worth considering the use of one of PHP's predefined interfaces for the Container class.
You declare objects in the function body and initiate them in the constructor (or a member function). You don't use [] when returning an array, $array[] has the same functionality as array_push, nothing more.
To clarify,
class myClass {
public $obj = array();
public function __construct() {
$this->obj[] = new OtherObject();
}
public function getObj() {
return $this->obj;
}
}
You cannot do this :
class DisplayTaxonomy {
public $MyArray[]= new DisplayTaxonomy();
}
because it's like an infinite loop :) So you have to use __contruct() function.
After change the :
return $MyArray[];
to :
return $MyArray;
Your first issue is due to trying to call the class you're declaring.
class DisplayTaxonomy {
public $MyArray[]= new DisplayTaxonomy();
You should initialize your object outside of the class, in the portion of code that you need to reference the class.
In addition, the object is already an array so you can omit attaching [] to the end return $MyArray:
public function whatever(){
$Temp = new DisplayTaxonomy();
$Temp->setADTitle("1");
$MyArray[] = $Temp;
return $MyArray;
}
You're declaring the array object here:
$MyArray[]= $Temp;//works just fine
You can't call code (new DisplayTaxonomy()) when definining class properties. You'll have to assign the value in the constructor of the class:
class Foo
{
public $MyArray;
public function __construct()
{
$this->MyArray = new DisplayTaxonomy();
}
}
The other issue is that the $array[] shortcut is for appending to an array. If you want to just return the array (and not write to the array which you're asking about with []), simply skip []:
return $MyArray;
Expanded:
As Vincent Joigƞie pointed out below; you're trying to create a class with the same name as the class you're already creating. This doesn't make any sense, except for static properties. In that case you can't use __construct(), but would rather create / set the object in the static method you're calling to retrieve the object the first time:
static public function getInstance()
{
if (self::$MyArray === null)
{
self::$MyArray = new DisplayTaxonomy();
}
return self::$MyArray;
}
This is however probably not what you want, and it seems you've confused something in your logic in your class definition. Guessing freely you might just want:
class Foo
{
public $MyArray = array();
}
As array() is a static assignment (and not a function call), it's allowed in the class definition.
This thread didn't helped me.
If I use
$class_vars = get_class_vars(get_class($this));
foreach ($class_vars as $name => $value) {
echo "$name : $value\n";
}
I get
attrib1_name : attrib2_name : attrib3_name
There are no values. Also a private attribute is shown, which I don't want.
If I use
echo "<pre>";
print_r(get_object_vars($this));
echo "</pre>";
I get
Array
(
[atrrib1_name] => attrib1_value
[attrib2_name] => attrib2_value
)
Here again I have a private attribute and all sub attributes. But this time I have the values. How can I constrain this to one level?
Isn't there a possibility to show all public attributes with their values of an object?
You are seeing non-public properties because get_class_vars works according to current scope. Since you are using $this your code is inside the class, so the non-public properties are accessible from the current scope. The same goes for get_object_vars which is probably a better choice here.
In any case, a good solution would be to move the code that retrieves the property values out of the class.
If you do not want to create a free function for that (why? seriously, reconsider!), you can use a trick that involves an anonymous function:
$getter = function($obj) { return get_object_vars($obj); };
$class_vars = $getter($this);
See it in action.
Update: Since you are in PHP < 5.3.0, you can use this equivalent code:
$getter = create_function('$obj', 'return get_object_vars($obj);');
$class_vars = $getter($this);
You can do this easily with php Reflection api
Extending Mr.Coder's answer, here is a snippet to fetch the public attributes of the object (name and value) as an array
public function getPublicProperties()
{
$results = [];
$reflectionObject = (new ReflectionObject($this));
$properties = $reflectionObject->getProperties(ReflectionProperty::IS_PUBLIC);
foreach ($properties as $property) {
$results[$property->getName()] = $property->getValue($this);
}
return $results;
}
Use get_object_vars.
see: http://dk.php.net/manual/en/function.get-object-vars.php
I Fully recognize what you are trying to achieve so why not have something external like this to help out... (pasted from PHPFiddle)
<?php
final class utils {
public static function getProperties(& $what) {
return get_object_vars($what);
}
}
class ball {
var $name;
private $x, $y;
function __construct($name,$x,$y) {
}
function publicPropsToArray() {
return utils::getProperties($this);
}
function allPropsToArray() {
return get_object_vars($this);
}
}
$ball1 = new ball('henry',5,6);
//$ball2 = new ball('henry',3,4);
echo "<pre>";
print_r($ball1->publicPropsToArray());
echo "\r\n\r\n";
print_r($ball1->allPropsToArray());
echo "\r\n\r\n";
?>
This way I can both access all properties of the object or for something such as a database access layer or similarly for a function that send "safe" data to a view or another un-privileged model I can send just the public properties, but have the behaviour defined within the object.
Sure this leads to coupling with a utility class, but to be fair not all couplings are bad, some are nesecarry to achieve an end goal, dont get bogged down by these things