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run code in 150+ php & hhvm versions
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<?php $a = array(1 => 'a', 2 => 'b', 3 => 'c'); $b = array_flip(array(1, 2)); print_r(array_replace(array(1, 2), array(2,3)));
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 2 [1] => 3 )
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/NEQi0 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/NEQi0 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/NEQi0 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/NEQi0 on line 4