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<?php function filterKeys($array,$search){ $allowed=array_filter(array_keys($array),function($key) use ($search){return stristr($key,$search);}); return array_intersect_key($array,array_flip($allowed)); } var_dump(filterKeys(array('foo'=>'bar', 'moo'=>'baz'),'foo')); ?>
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["foo"]=> string(3) "bar" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/RoKlG on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/RoKlG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/RoKlG on line 3
Process exited with code 255.