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<?php class A { var $a = 5; public $bg = ['g'=>44,'h'=>55]; public function __set($name, $value) { if(!isset($bg[$value])) { throw new Exception("Cannot add new property \$$name to instance of " . __CLASS__); } } } $a=new A; echo $a->a; $a->a = 9; echo $a->a; $a->b = 88; echo $a->b;
Output for git.master, git.master_jit, rfc.property-hooks
59 Fatal error: Uncaught Exception: Cannot add new property $b to instance of A in /in/1298E:9 Stack trace: #0 /in/1298E(19): A->__set('b', 88) #1 {main} thrown in /in/1298E on line 9
Process exited with code 255.

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