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run code in 150+ php & hhvm versions
Bugs & Features
<?php print_r(array_keys('hello', 'bye'));
Output for 5.3.0 - 7.1.0
Warning: array_keys() expects parameter 1 to be array, string given in /in/67QCl on line 3
Output for 4.3.2 - 5.2.17
Warning: array_keys(): The first argument should be an array in /in/67QCl on line 3
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/67QCl on line 3