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<?php $array1 = array( "name", 'a', 'b'); $array2 = array( "letsc" ); print_r(array_fill_keys($array2, $array1));
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [letsc] => Array ( [0] => name [1] => a [2] => b ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function array_fill_keys() in /in/dKWpu on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_fill_keys() in /in/dKWpu on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_fill_keys() in /in/dKWpu on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_fill_keys() in /in/dKWpu on line 7