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<?php class A { var $a = 5; public $bg = ['g'=>44,'h'=>55]; public function __set($name, $value) { echo $this->bg[$name]; if(!(isset($this->bg[$name]))) { throw new Exception("Cannot add new property \$$name to instance of " . __CLASS__); } else { $this->bg[$name] = $value; } } } $a=new A; echo $a->a; $a->a = 9; echo $a->a; $a->gt = 88; echo $a->bg['g'];
Output for git.master_jit, git.master, rfc.property-hooks
59 Warning: Undefined array key "gt" in /in/U503Q on line 11 Fatal error: Uncaught Exception: Cannot add new property $gt to instance of A in /in/U503Q:14 Stack trace: #0 /in/U503Q(27): A->__set('gt', 88) #1 {main} thrown in /in/U503Q on line 14
Process exited with code 255.

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