3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $colors = array('red', 'blue', 'green', 'yellow'); foreach ($colors as &$color) { strtoupper($color); } var_dump($colors);
based on R9eJT
Output for 5.2.1 - 7.1.0
array(4) { [0]=> string(3) "red" [1]=> string(4) "blue" [2]=> string(5) "green" [3]=> &string(6) "yellow" }
Output for 5.0.0 - 5.2.0
array(4) { [0]=> &string(3) "red" [1]=> &string(4) "blue" [2]=> &string(5) "green" [3]=> &string(6) "yellow" }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/6bsYl 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 '&', expecting T_VARIABLE or '$' in /in/6bsYl on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/6bsYl on line 5
Process exited with code 255.