将HTTP添加到url

Question

I have a function which is used to add an http:// to a url,which do not have a http:// like as below

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

return $url;
}

My problem is ,

If i pass a url with &,the string after the & will skipped, eg:
https://www.example.com/Welcome/Default.aspx?scenarioID=360&pid=3308&treeid=1000 Returns

https://www.example.com/Welcome/Default.aspx?scenarioID=360

I lose &pid=3308&treeid=1000 this part,How to fix this error??

Answer 1

I am unable to reproduce the error using PHP 5.5. However, personally I don't like to use a regular expression when there are built in functions that do the job. The following should work just fine as a replacement for the regular expression ~^(?:f|ht)tps?://~i:

<?php
function addhttp($url, $https=false) {
    $protocols = ['https://', 'http://', 'ftps://', 'ftp://'];
    $heystack = strtolower(substr($url, 0, 8));
    foreach ($protocols as $protocol) {
        if (strpos($heystack, $protocol) === 0) {
            return $url;
        }
    }
    return ($https ? 'https://' : 'http://') . $url;
}

$url = 'www.example.com/Welcome/Default.aspx?scenarioID=360&pid=3308&treeid=1000';
// for http://
echo addhttp($url); 
// for https://
echo addhttp($url, true); 

I added an optional parameter here, if you don't like it just take it out and remove the ternary expression (<expression> ? true : false).

If you need to get the value of the URL see this question