3v4l.org

run code in 150+ php & hhvm versions
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<?php $colors = array('red', 'blue', 'green', 'yellow'); foreach ($colors as &$color) { $color = strtoupper($color); } var_dump($colors);
based on 6bsYl
Output for 5.2.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(3) "RED" [1]=> string(4) "BLUE" [2]=> string(5) "GREEN" [3]=> &string(6) "YELLOW" }
Output for 5.0.0 - 5.2.0
array(4) { [0]=> &string(3) "RED" [1]=> &string(4) "BLUE" [2]=> &string(5) "GREEN" [3]=> &string(6) "YELLOW" }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/FLhqe 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 '$' in /in/FLhqe on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/FLhqe on line 5
Process exited with code 255.