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run code in 150+ php & hhvm versions
Bugs & Features
<?php class my { private $a = null; protected $b = 'b'; public $c = 'c'; function __construct($b, $c) { $this->a = 'a1'; $this->b = $b; $this->c = $c; } public function test() { echo $this->a, $this->b, $this->c; } } class my_ex extends my { function __construct() { $cleaner = function () { echo "Clearing all properties", "<br>"; unset($this->a, $this->b, $this->c); }; $cleaner->bindTo($this, get_parent_class($this))->__invoke(); } function __get($name) { $lazySetter = function($name) { echo "Lazy-loading property {$name}", "<br>"; $this->$name = "new{$name}"; return $this->$name; }; return $lazySetter->bindTo($this, get_parent_class($this))->__invoke($name); } } $my = new my_ex(1,2); $my->test();
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Clearing all properties<br>Lazy-loading property a<br>newaLazy-loading property b<br>newbLazy-loading property c<br>newc
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Fatal error: Call to undefined method Closure::bindTo() in /in/9bIW1 on line 31
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/9bIW1 on line 27
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/9bIW1 on line 27
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9bIW1 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9bIW1 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/9bIW1 on line 4
Process exited with code 255.