preg_match_all('/([\x22\x27])((?:.(?!\1))*.)\1/', '"var1" "var2" "var3" "var4 heh"', $matches);
print_r($matches);





Array
(
    [0] => Array
        (
            [0] => "var1"
            [1] => "var2"
            [2] => "var3"
            [3] => "var4 heh"
        )

    [1] => Array
        (
            [0] => "
            [1] => "
            [2] => "
            [3] => "
        )

    [2] => Array
        (
            [0] => var1
            [1] => var2
            [2] => var3
            [3] => var4 heh
        )

)