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run code in 150+ php & hhvm versions
Bugs & Features
<?php class MyClass { function doSomething() { echo "HELLO WORLD\n"; } } $myInstance = null; $broken = function() use ($myInstance) { if(!empty($myInstance)) $myInstance->doSomething(); else echo "\$myInstance is empty.\n"; var_dump($myInstance); // NULL }; $working = function() use (&$myInstance) { if(!empty($myInstance)) $myInstance->doSomething(); else print "\$myInstance is empty.\n"; }; $myInstance = new MyClass(); $myInstance->doSomething(); // Outputs HELLO WORLD. $broken(); // Outputs $myInstance is empty. NULL $working(); // Outputs HELLO WORLD.
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
HELLO WORLD $myInstance is empty. NULL HELLO WORLD
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/OYrM9 on line 11
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/OYrM9 on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/OYrM9 on line 11
Process exited with code 255.