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<?php $x = array('a'=>'x', 'b'=>'b', 'c'=>'z'); $y = array(1,2,3); var_dump(array_combine($x, $y));
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { ["x"]=> int(1) ["b"]=> int(2) ["z"]=> int(3) }
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/HI16R on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_combine() in /in/HI16R on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_combine() in /in/HI16R on line 4