3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $header = array('test'); if (array_key_exists('class', $header[0])) { echo 'set'; } else { echo 'not set'; }
based on XJdKl
Output for 5.3.0 - 7.1.0
Warning: array_key_exists() expects parameter 2 to be array, string given in /in/LTV2O on line 3 not set
Output for 4.3.2 - 5.2.17
Warning: array_key_exists(): The second argument should be either an array or an object in /in/LTV2O on line 3 not set
Output for 4.3.0 - 4.3.1
Warning: array_key_exists() [http://www.php.net/function.array-key-exists]: The second argument should be either an array or an object in /in/LTV2O on line 3 not set