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run code in 150+ php & hhvm versions
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<?php $str = "1,5"; $base = array('1'=>'Bread','5'=>'Butter'); $flipped = array_flip( explode(',', $str)); print_r( $flipped); print_r( array_merge( $flipped, $base)); $intersection = array_intersect_key( array_merge( $flipped, $base), $flipped); print_r( $intersection); $replacements = array_values( $intersection); print_r( $replacements);
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [1] => 0 [5] => 1 ) Array ( [0] => 0 [1] => 1 [2] => Bread [3] => Butter ) Array ( [1] => 1 ) Array ( [0] => 1 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Array ( [1] => 0 [5] => 1 ) Array ( [0] => 0 [1] => 1 [2] => Bread [3] => Butter ) Fatal error: Call to undefined function array_intersect_key() in /in/CCa7i on line 10
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Array ( [1] => 0 [5] => 1 ) Array ( [0] => 0 [1] => 1 [2] => Bread [3] => Butter ) Fatal error: Call to undefined function: array_intersect_key() in /in/CCa7i on line 10
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Array ( [1] => 0 [5] => 1 ) Array ( [0] => 0 [1] => 1 [2] => Bread [3] => Butter ) Fatal error: Call to undefined function: array_intersect_key() in /in/CCa7i on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Array ( [1] => 0 [5] => 1 ) Array ( [0] => 0 [1] => 1 [2] => Bread [3] => Butter ) Fatal error: Call to undefined function: array_intersect_key() in /in/CCa7i on line 10