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    Objects

    Inizializzazione di un object

    Per creare un nuovo object, utilizzare l'istruzione new per istanziare una classe:

    <?php
    class foo
    {
    function     do_foo()
    {
    echo     "Doing foo.";
    }
    }

    $bar = new foo;
    $bar->do_foo();
    ?>

    Per una discussione completa, vedere il capitolo Classi e Oggetti.

    Conversione a object

    Se un object viene convertito in un altro object, non subisce modifiche. Se un valore di un qualsiasi altro tipo viene convertito ad object, una nuova istanza della classe built-in stdClass viene creata. Se il valore era null, la nuova istanza sarà vuota. Un array viene convertito in object utilizzando i nomi degli indici ed il loro corrispondente valore come attributi, fatta eccezione per gli indici numerici, i quali saranno inaccessibili a meno che non vengano iterati.

    <?php
    $obj     = (object) array('1' => 'foo');
    var_dump(isset($obj->{'1'})); // outputs 'bool(false)'
    var_dump(key($obj)); // outputs 'int(1)'
    ?>

    Per ogni altro valore, una variabile di classe chiamata scalar conterrà quel valore.

    <?php
    $obj     = (object) 'ciao';
    echo     $obj->scalar; // outputs 'ciao'
    ?>
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    User Contributed Notes 8 notes

    up
    660
    helpful at stranger dot com
    12 years ago
    By far the easiest and correct way to instantiate an empty generic php object that you can then modify for whatever purpose you choose:

    <?php $genericObject = new stdClass(); ?>

    I had the most difficult time finding this, hopefully it will help someone else!
    up
    252
    Anthony
    8 years ago
    In PHP 7 there are a few ways to create an empty object:

    <?php
    $obj1     = new \stdClass; // Instantiate stdClass object
    $obj2 = new class{}; // Instantiate anonymous class
    $obj3 = (object)[]; // Cast empty array to object

    var_dump($obj1); // object(stdClass)#1 (0) {}
    var_dump($obj2); // object(class@anonymous)#2 (0) {}
    var_dump($obj3); // object(stdClass)#3 (0) {}
    ?>

    $obj1 and $obj3 are the same type, but $obj1 !== $obj3. Also, all three will json_encode() to a simple JS object {}:

    <?php
    echo json_encode([
        new \    stdClass,
        new class{},
        (object)[],
    ]);
    ?>

    Outputs: [{},{},{}]
    up
    44
    twitter/matt2000
    9 years ago
    As of PHP 5.4, we can create stdClass objects with some properties and values using the more beautiful form:

    <?php
      $object     = (object) [
            'propertyOne' => 'foo',
            'propertyTwo' => 42,
      ];
    ?>
    up
    21
    developer dot amankr at gmail dot com (Aman Kuma)
    8 years ago
    <!--Example shows how to convert array to stdClass Object and how to access its value for display -->
    <?php
    $num     = array("Garha","sitamarhi","canada","patna"); //create an array
    $obj = (object)$num; //change array to stdClass object

    echo "<pre>";
    print_r($obj); //stdClass Object created by casting of array

    $newobj = new stdClass();//create a new
    $newobj->name = "India";
    $newobj->work = "Development";
    $newobj->address="patna";

    $new = (array)$newobj;//convert stdClass to array
    echo "<pre>";
    print_r($new); //print new object

    ##How deals with Associative Array

    $test = [Details=>['name','roll number','college','mobile'],values=>['Naman Kumar','100790310868','Pune college','9988707202']];
    $val = json_decode(json_encode($test),false);//convert array into stdClass object

    echo "<pre>";
    print_r($val);

    echo ((    is_array($val) == true ?  1 : 0 ) == 1 ? "array" : "not an array" )."</br>"; // check whether it is array or not
    echo ((is_object($val) == true ?  1 : 0 ) == 1 ? "object" : "not an object" );//check whether it is object or not
    ?>
    up
    39
    Ashley Dambra
    10 years ago
    Here a new updated version of 'stdObject' class. It's very useful when extends to controller on MVC design pattern, user can create it's own class.

    Hope it help you.

    <?php
    class stdObject {
        public function     __construct(array $arguments = array()) {
            if (!empty(    $arguments)) {
                foreach (    $arguments as $property => $argument) {
                        $this->{$property} = $argument;
                }
            }
        }

        public function     __call($method, $arguments) {
                $arguments = array_merge(array("stdObject" => $this), $arguments); // Note: method argument 0 will always referred to the main class ($this).
                if (isset($this->{$method}) && is_callable($this->{$method})) {
                return     call_user_func_array($this->{$method}, $arguments);
            } else {
                throw new     Exception("Fatal error: Call to undefined method stdObject::{$method}()");
            }
        }
    }

    // Usage.

    $obj = new stdObject();
    $obj->name = "Nick";
    $obj->surname = "Doe";
    $obj->age = 20;
    $obj->adresse = null;

    $obj->getInfo = function($stdObject) { // $stdObject referred to this object (stdObject).
            echo $stdObject->name . " " . $stdObject->surname . " have " . $stdObject->age . " yrs old. And live in " . $stdObject->adresse;
    };

    $func = "setAge";
    $obj->{$func} = function($stdObject, $age) { // $age is the first parameter passed when calling this method.
            $stdObject->age = $age;
    };

    $obj->setAge(24); // Parameter value 24 is passing to the $age argument in method 'setAge()'.

    // Create dynamic method. Here i'm generating getter and setter dynimically
    // Beware: Method name are case sensitive.
    foreach ($obj as $func_name => $value) {
        if (!    $value instanceOf Closure) {

                $obj->{"set" . ucfirst($func_name)} = function($stdObject, $value) use ($func_name) {  // Note: you can also use keyword 'use' to bind parent variables.
                    $stdObject->{$func_name} = $value;
            };

                $obj->{"get" . ucfirst($func_name)} = function($stdObject) use ($func_name) {  // Note: you can also use keyword 'use' to bind parent variables.
                    return $stdObject->{$func_name};
            };

        }
    }

    $obj->setName("John");
    $obj->setAdresse("Boston");

    $obj->getInfo();
    ?>
    up
    10
    Mithras
    16 years ago
    In response to harmor: if an array contains another array as a value, you can recursively convert all arrays with:

    <?php
    function arrayToObject( $array ){
      foreach(     $array as $key => $value ){
        if(     is_array( $value ) ) $array[ $key ] = arrayToObject( $value );
      }
      return (object)     $array;
    }
    ?>
    up
    2
    qeremy [atta] gmail [dotta] com
    12 years ago
    Do you remember some JavaScript implementations?

    // var timestamp = (new Date).getTime();

    Now it's possible with PHP 5.4.*;

    <?php
    class Foo
    {
        public     $a = "I'm a!";
        public     $b = "I'm b!";
        public     $c;
       
        public function     getB() {
            return     $this->b;
        }
       
        public function     setC($c) {
                $this->c = $c;
            return     $this;
        }
       
        public function     getC() {
            return     $this->c;
        }
    }

    print (new     Foo)->a;      // I'm a!
    print (new Foo)->getB(); // I'm b!
    ?>

    or

    <?php
    // $_GET["c"] = "I'm c!";
    print (new Foo)
           ->    setC($_GET["c"])
           ->    getC(); // I'm c!
    ?>
    up
    5
    mailto dot aurelian at gmail dot com
    15 years ago
    You can create [recursive] objects with something like:
    <?php
      $literalObjectDeclared     = (object) array(
             'foo' => (object) array(
                  'bar' => 'baz',
                  'pax' => 'vax'
              ),
              'moo' => 'ui'
           );
    print     $literalObjectDeclared->foo->bar; // outputs "baz"!
    ?>
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