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<?php class Foo { private $id; public function __construct() { $this->id = 1; } public function __toString() { return $id . ""; } public function setId($id) { $this->id = $id; } } $a = new Foo; // $a is a pointer pointing to Foo object 0 $b = $a; // $b is a pointer pointing to Foo object 0, however, $b is a copy of $a $a = new Foo(); $a->setId(231); var_dump($b); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
object(Foo)#1 (1) { ["id":"Foo":private]=> int(1) } object(Foo)#2 (1) { ["id":"Foo":private]=> int(231) }

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