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<?php class A { var $a = 5; public $bg = ['g'=>44,'h'=>55]; public function __set($name, $value) { echo $name; if(!isset($bg[$name])) { throw new Exception("Cannot add new property \$$name to instance of " . __CLASS__); } } } $a=new A; echo $a->a; $a->a = 9; echo $a->a; $a->g = 88; echo $a->g;
Output for git.master, git.master_jit, rfc.property-hooks
59g Fatal error: Uncaught Exception: Cannot add new property $g to instance of A in /in/POulb:13 Stack trace: #0 /in/POulb(23): A->__set('g', 88) #1 {main} thrown in /in/POulb on line 13
Process exited with code 255.

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