PHP 8x Use Of Str Starts With Functions

PHP 8 or newer:
Use the str_starts_with function:

str_starts_with('', 'http')
PHP 7 or older:
Use the substr function to return a part of a string.

substr( $string_n, 0, 4 ) === "http"
If you're trying to make sure it's not another protocol. I'd use http:// instead, since https would also match, and other things such as

substr( $string_n, 0, 7 ) === "http://"
And in general:

substr($string, 0, strlen($query)) === $query

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