How to add http:// if it doesn't exist in the URL

php, regex

Solution

A modified version of @nickf code:

function addhttp($url) {
    if (!preg_match("~^(?:f|ht)tps?://~i", $url)) {
        $url = "http://" . $url;
    }
    return $url;
}

Recognizes `ftp://`, `ftps://`, `http://` and `https://` in a case insensitive way.

Problem

How can I add `http://` to a URL if it doesn't already include a protocol (e.g. `http://`, `https://` or `ftp://`)? Example: ``` addhttp("google.com"); // http://google.com addhttp("www.google.com"); // http://www.google.com addhttp("google.com"); // http://google.com addhttp("ftp://google.com"); // ftp://google.com addhttp("https://google.com"); // https://google.com addhttp("http://google.com"); // http://google.com addhttp("rubbish"); // http://rubbish ```

Original source