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<?php function reorderArray($array, $key) { $found = false; foreach($array as $k=>$v) { $found = $found || $k===$key; if(!$found) { unset($array[$k]); $array[$k] = $v; } } return $array; } $array=[1=>'foo', 4=>'bar', 9=>'baz', 'test'=>51]; var_dump(reorderArray($array, 9)); var_dump(reorderArray($array, 'test')); var_dump(reorderArray($array, 'no_such_key'));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [9]=> string(3) "baz" ["test"]=> int(51) [1]=> string(3) "foo" [4]=> string(3) "bar" } array(4) { ["test"]=> int(51) [1]=> string(3) "foo" [4]=> string(3) "bar" [9]=> string(3) "baz" } array(4) { [1]=> string(3) "foo" [4]=> string(3) "bar" [9]=> string(3) "baz" ["test"]=> int(51) }

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