Php检查字符串是否包含多个'?‘或双倍'//‘

$string = "This is a string with multiple ?? and //";
if (preg_match('/(\?{2,}|\/\/)/', $string)) {
    echo "The string contains multiple ?? or //";
} else {
    echo "The string does not contain multiple ?? or //";
}

$string = "This is a string with multiple ?? and //";
if (strpos($string, '??') !== false || strpos($string, '//') !== false) {
    echo "The string contains multiple ?? or //";
} else {
    echo "The string does not contain multiple ?? or //";
}