Making links except youtube ones in PHP from a string - php

Question

I'm doing a forum and i got a function from the internet that makes links from text, but i wanted it to ignore youtube links for example http://www.youtube.com/....
this is the code:
function makeLinks($str) {
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";
$urls = array();
$urlsToReplace = array();
if(preg_match_all($reg_exUrl, $str, $urls)) {
$numOfMatches = count($urls[0]);
$numOfUrlsToReplace = 0;
for($i=0; $i<$numOfMatches; $i++) {
$alreadyAdded = false;
$numOfUrlsToReplace = count($urlsToReplace);
for($j=0; $j<$numOfUrlsToReplace; $j++) {
if($urlsToReplace[$j] == $urls[0][$i]) {
$alreadyAdded = true;
}
}
if(!$alreadyAdded) {
array_push($urlsToReplace, $urls[0][$i]);
}
}
$numOfUrlsToReplace = count($urlsToReplace);
for($i=0; $i<$numOfUrlsToReplace; $i++) {
$str = str_replace($urlsToReplace[$i], "".$urlsToReplace[$i]." ", $str);
}
return $str;
} else {
return $str;
}
}

Answer 1

Try something like this:
if (preg_match('/youtube.com/i', strtolower($str))) {
return $str;
}
Add this after function makeLinks($str) {
Usage:
var_dump(makeLinks('http://www.youtube.com'));
var_dump(makeLinks('http://www.test.com'));
Outputs:
string 'http://www.youtube.com' (length=22)
string 'http://www.test.com ' (length=54)

Answer 2

Look to see if $urls[0][$i] does not match youtube before adding it to the array of urls to turn into links. For example, replace this snippet:
if(!$alreadyAdded) {
array_push($urlsToReplace, $urls[0][$i]);
}
With this:
if(!$alreadyAdded) {
if (!preg_match('/youtu\.?be/i', $urls[0][$i])) {
array_push($urlsToReplace, $urls[0][$i]);
}
}