What would be the most rational way to parse youtube video link for video ID in PHP? [duplicate]

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Possible Duplicates:

Youtube API - Extract video ID

How do I extract query parameters from an URL string in PHP?开发者_开发问答

If the input is as follows:

$input = 'http://www.youtube.com/watch?v=ALph_u2iee8&feature=topvideos_music';

And I want to end up with:

$result = 'ALph_u2iee8';

What would be the most rational way to do this in PHP?

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PHP has functions to deal with this already.

$input = 'http://www.youtube.com/watch?v=ALph_u2iee8&feature=topvideos_music';

$queryString = parse_url($input, PHP_URL_QUERY);

$queries = array();

parse_str($queryString, $queries);

echo $queries['v'];

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I use this function when I'm trying to grab a youtube video ID from a URL

function get_youtube_id_from_url( $url ) {
    preg_match('/[\\?&]v=([^&#]*)/si', $url, $matches );

    return !empty( $matches ) ? $matches[1] : false;
}

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Some will say to use a regex, but for something this simple, it is faster and better to go with subtrings.

This should do the job:

$input = 'http://www.youtube.com/watch?v=ALph_u2iee8&feature=topvideos_music';
$start = strpos($input, '?v=');
$length = strpos($input, '&', $start + 1) - $start;
echo substr($input, $start + 3, $length);

Of course, the parse_url/parse_str is the correct way.