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<?php $a = array('0345', '234', '345', '345'); $b = array('asd'=>array('d'), '234', '345', '346'); var_dump(array_combine($a, $b));
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { ["0345"]=> array(1) { [0]=> string(1) "d" } [234]=> string(3) "234" [345]=> string(3) "346" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_combine() in /in/4mJ6N on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_combine() in /in/4mJ6N on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_combine() in /in/4mJ6N on line 5