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<?php class myClass { private $a; public function __construct() { $this->a = 10; } public function printValue() { print "The Value is: {$this->a}\n"; } public function changeValue($val, $obj = null) { if(is_null($obj)) { $this->a = $val; } else { $obj->a = $val; } } public function getValue() { return $this->a; } } $obj_one = new myClass(); $obj_two = new myClass(); $obj_one->changeValue(20, $obj_two); $obj_two->changeValue($obj_two->getValue(), $obj_one); $obj_two->printValue(); $obj_one->printValue();
Output for git.master, git.master_jit, rfc.property-hooks
The Value is: 20 The Value is: 20

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