determine if a php string terminated code example

Example: php string ends with

function stringStartsWith($haystack,$needle,$case=true) {
    if ($case){
        return strpos($haystack, $needle, 0) === 0;
    }
    return stripos($haystack, $needle, 0) === 0;
}

function stringEndsWith($haystack,$needle,$case=true) {
    $expectedPosition = strlen($haystack) - strlen($needle);
    if ($case){
        return strrpos($haystack, $needle, 0) === $expectedPosition;
    }
    return strripos($haystack, $needle, 0) === $expectedPosition;
}
echo stringStartsWith("Hello World","Hell"); // true
echo stringEndsWith("Hello World","World"); // true