3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = array(0 => 100, "color" => "red"); $keys = array_keys($array[0]); foreach($keys as $key) { echo $key ; } ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_keys() expects parameter 1 to be array, integer given in /in/YD6q4 on line 4 Warning: Invalid argument supplied for foreach() in /in/YD6q4 on line 5
Output for hhvm-3.10.0 - 3.12.0
Warning: array_keys() expects parameter 1 to be an array or collection in /in/YD6q4 on line 4 Warning: Invalid argument supplied for foreach() in /in/YD6q4 on line 7
Output for 4.3.2 - 4.3.10, 4.4.0 - 5.2.17
Warning: array_keys(): The first argument should be an array in /in/YD6q4 on line 4 Warning: Invalid argument supplied for foreach() in /in/YD6q4 on line 5
Output for 4.3.11
Warning: array_keys(): The first argument should be an array in /in/YD6q4 on line 4
Output for 4.3.0 - 4.3.1
Warning: array_keys() [http://www.php.net/function.array-keys]: The first argument should be an array in /in/YD6q4 on line 4 Warning: Invalid argument supplied for foreach() in /in/YD6q4 on line 5