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run code in 150+ php & hhvm versions
Bugs & Features
<?php $test = array( array('a' => 'testA', 'b' => 'testB'), array('a' =>'testC', 'b' => 'testD') ); print_r(array_keys('testC'));
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_keys() expects parameter 1 to be array, string given in /in/lZXe0 on line 9
Output for hhvm-3.10.0 - 3.12.0
Warning: array_keys() expects parameter 1 to be an array or collection in /in/lZXe0 on line 9
Output for 4.3.2 - 5.2.17
Warning: array_keys(): The first argument should be an array in /in/lZXe0 on line 9
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/lZXe0 on line 9