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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Foo { private $bar = 'baz'; public function getBar() { return $this->bar; } } // http://3v4l.org/pc6lo#v540 class ClassicLazyFoo extends Foo { private $initialized = false; public function getBar() { $this->init(); return parent::getBar(); } private function init() { if ($this->initialized) { return; } \Closure::bind(function() { $this->bar = 'Loaded from DB!'; }, $this, get_parent_class($this))->__invoke(); } } // look ma: no method overrides! class LazyPropertyLazyFoo extends Foo { public function __construct() { \Closure::bind(function() { unset($this->bar); }, $this, get_parent_class($this))->__invoke(); } // note that other magic accessors also need to be created for full functional completeness public function __get($name) { \Closure::bind(function() { $this->bar = 'Loaded from DB!'; }, $this, get_parent_class($this))->__invoke(); return $this->$name; } } var_dump((new ClassicLazyFoo())->getBar()); var_dump((new LazyPropertyLazyFoo())->getBar());
based on Wju5q
Output for 5.4.0 - 7.1.0
string(15) "Loaded from DB!" Notice: Undefined property: LazyPropertyLazyFoo::$bar in /in/bCTP4 on line 52 NULL
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/bCTP4 on line 57
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/bCTP4 on line 29 Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/bCTP4 on line 29
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/bCTP4 on line 29 Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/bCTP4 on line 29
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/bCTP4 on line 5
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/bCTP4 on line 5
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/bCTP4 on line 5
Process exited with code 255.