--TEST-- Test array_intersect_key() function : usage variation - Passing integer indexed array --FILE-- '0', -1 => '-1' , 02 => 'two', -07 => '-07', 0xA => '0xA', -0xC => '-0xc'); $input_arrays = array( 'decimal indexed' => array(10 => '10', '-17' => '-17'), 'octal indexed' => array(-011 => '-011', 012 => '012'), 'hexa indexed' => array(0x12 => '0x12', -0x7 => '-0x7', ), ); foreach($input_arrays as $key =>$value) { echo "\n--$key--\n"; var_dump( array_intersect_key($input_array, $value) ); var_dump( array_intersect_key($value,$input_array ) ); } ?> ===DONE=== --EXPECTF-- *** Testing array_intersect_key() : usage variation *** --decimal indexed-- array(1) { [10]=> string(3) "0xA" } array(1) { [10]=> string(2) "10" } --octal indexed-- array(1) { [10]=> string(3) "0xA" } array(1) { [10]=> string(3) "012" } --hexa indexed-- array(1) { [-7]=> string(3) "-07" } array(1) { [-7]=> string(4) "-0x7" } ===DONE===