3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $c = 0; $num = 2; $array = array(1,2,3,4,5,6,7); foreach($array as $key) { $c++; echo key(prev($array)); if($c == 6) { break; } }
based on kqoW0
Output for 7.0.0 - 7.1.0
Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8
Output for hhvm-3.12.0
Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8 Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8 Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8 Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8 Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8 Warning: Invalid operand type was used: expecting an array in /in/Sb0tU on line 8
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.28
Warning: key() expects parameter 1 to be array, integer given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8 Warning: key() expects parameter 1 to be array, boolean given in /in/Sb0tU on line 8
Output for 4.3.2 - 5.0.4, 5.1.0 - 5.2.17
Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key(): Passed variable is not an array or object in /in/Sb0tU on line 8
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/Sb0tU on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8 Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/Sb0tU on line 8