why do i get query twice - php

Question

I'm trying to basically extract the ?v= (the query part) of the youtube.com url... it's to automatically embed the video when someone types in a youtube.com URI (i.e. someone will type in http://www.youtube.com/?v=xyz, this program should embed it into the page automatically).
Anyway when I run the following code, I get two QUERY(ies) for the first URI:
<?php
//REGEX CONTROLLER:
//embedding youtube:
function youtubeEmbedd($text)
{
//scan text and find:
// http://www.youtube.com/
// www.youtube.com/
$youtube_pattern = "(http\:\/\/www\.youtube\.com\/(watch)??\?v\=[a-zA-Z0-9]+(\&[a-z]\=[a-zA-Z0-9])*?)"; // the pattern
#"http://www.youtube.com/?v="
echo "<hr/>";
$links = preg_match_all($youtube_pattern, $text, $out, PREG_SET_ORDER); // use preg_replace here
if ($links)
{
for ($i = 0; $i != count($out); $i++)
{
echo "<b><u> URL </b><br/></u> ";
foreach ($out[$i] as $url)
{
// split url[QUERY] here and replaces it with embed code:
$youtube = parse_url($url);
echo "QUERY: " . $youtube["query"] . "<br/>";
#$pos = strpos($url, "?v=");
}
}
}
else
{
echo "no match";
}
}
youtubeEmbedd("tthe quick gorw fox http://www.youtube.com/watch?v=5qm8PH4xAss&x=4dD&k=58J8 and http://www.youtube.com/?v=Dd3df4e ");
?>
Output is:
URL
QUERY: v=5qm8PH4xAss
QUERY: << WHY DOES THIS APPEAR????????????
URL
QUERY: v=Dd3df4e
I would be greatful for any help.

Answer 1

Your regular expression stores a result in $out like this:
(
[0] => Array
(
[0] => http://www.youtube.com/watch?v=5qm8PH4xAss
[1] => watch
)
[1] => Array
(
[0] => http://www.youtube.com/?v=Dd3df4e
)
)
Your regular expression has a subgroup for matching the text watch, and so this ends up as a result in the array.
Since you iterate through all results $out[$i] you're trying to run parse_url on the second result of the first match; this leads to an empty output.
To fix your issue, simple change your iteration to something like:
if($links){
foreach($out as $result){
$youtube = parse_url($result[0]);
echo "<b><u> URL </b><br/></u> QUERY: " . $youtube["query"] . "<br/>";
}
}