Can someone show me how to get the youtube id out of a url regardless of what other GET variables are in the URL.
Use this video for example:
v= and before the next
(You can use regexes for just about anything, but they are very easy to make an error in, so if there are PHP functions specifically for what you are trying to accomplish, use those.)
parse_url takes a string and cuts it up into an array that has a bunch of info. You can work with this array, or you can specify the one item you want as a second argument. In this case we’re interested in the query, which is
Now we have the query, which is
v=C4kxS1ksqtw&feature=relate, but we only want the part after
v=. For this we turn to
parse_str which basically works like
GET on a string. It takes a string and creates the variables specified in the string. In this case
$feature is created. We’re only interested in
To be safe, you don’t want to just store all the variables from the
parse_url in your namespace (see mellowsoon’s comment). Instead store the variables as elements of an array, so that you have control over what variables you are storing, and you cannot accidentally overwrite an existing variable.
Putting everything together, we have:
<?php $url = "http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=relate"; parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars ); echo $my_array_of_vars['v']; // Output: C4kxS1ksqtw ?>
Some people, when confronted with a problem, think ‘I know, I’ll use regular expressions.’ Now they have two problems.