3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function foo(&$var) { $var++; } function &bar() { $a = 5; return $a; } foo(bar());
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0