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<?php $_REQUEST = array("first_name" => "John", "foo" => "foo"); $default = array("first_name" => ""); $inputs = array_intersect_key($_REQUEST, $default) + $_REQUEST; var_dump($inputs);
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { ["first_name"]=> string(4) "John" ["foo"]=> string(3) "foo" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function array_intersect_key() in /in/lCHnl on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_intersect_key() in /in/lCHnl on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_intersect_key() in /in/lCHnl on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_intersect_key() in /in/lCHnl on line 4