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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__); } } } $a=new A; echo $a->a; $a->a = 9; echo $a->a; $a->g = 88; echo $a->g;
Output for git.master_jit, git.master, rfc.property-hooks
5944 Warning: Undefined property: A::$g in /in/ZN2sV on line 25

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