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<?php $a = array('test','ee','dd'); $b = array(-1 => 'other'); var_dump(array_replace($b,$a));
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [-1]=> string(5) "other" [0]=> string(4) "test" [1]=> string(2) "ee" [2]=> string(2) "dd" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
Fatal error: Call to undefined function array_replace() in /in/u1RMi on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_replace() in /in/u1RMi on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_replace() in /in/u1RMi on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_replace() in /in/u1RMi on line 4