$arr1 = array([0] => array(['key1'] => "value1", ['key2'] => "value2"), [1] => array(['key1'] => "value3", ['key2'] => "value4"));
$arr2 = array([0] => "value5", [1] => "value6");
$arr3 = array([0] => array(['key1'] => "value1", ['key2'] => "value2", ['key3'] => "value5"), [1] => array(['key1'] => "value3", ['key2'] => "value4", ['key3'] => "value6"));
?