3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function f(&$a) { echo 'works'; } $b=1; $c=&$b; call_user_func_array('f', array($b));
Output for 7.1.0 - 7.2.6
Warning: Parameter 1 to f() expected to be a reference, value given in /in/dtAgj on line 7 works
Output for 7.0.0 - 7.0.20
Warning: Parameter 1 to f() expected to be a reference, value given in /in/dtAgj on line 7
Output for 4.3.0 - 5.6.28
works