PraseYoutubeUrl

<?php

# http://blog.luutaa.com/extract-youtube-and-vimeo-video-id-from-link/
# https://github.com/eyecatchup/php-yt_downloader/blob/master/youtube-dl.class.php#L259
# https://gist.github.com/ghalusa/6c7f3a00fd2383e5ef33
# https://stackoverflow.com/questions/2936467/parse-youtube-video-id-using-preg-match
# https://hotexamples.com/examples/-/-/parse_yturl/php-parse_yturl-function-examples.html
# https://stackoverflow.com/questions/18922728/meaning-of-youtube-nocookie-and-rel-0-in-the-iframe-embed-code

$regex = '#^(?:https?://)?(?:www\\.)?(?:youtu\\.be/|youtube\\.com(?:/embed/|/v/|/watch\\?v=|/watch\\?.+&v=))([\\w-]{11})(?:.+)?$#x';
$regex = '%(?:youtube(?:-nocookie)?\.com/(?:[\w\-?&!#=,;]+/[\w\-?&!#=/,;]+/|(?:v|e(?:mbed)?)/|[\w\-?&!#=,;]*[?&]v=)|youtu\.be/)([\w-]{11})(?:[^\w-]|\Z)%i' ;
$regex = '%(?:m\.|)(?:yout.*)(?:[^\/]+\/|.*[?&]v=)([^"&?\/]{11})%i' ;

function parse_yturl ( $url ) {
    $pattern  = '~';
    $pattern .= '(?:https?:\/\/|)';                         # Optional scheme. Either http or https + ://
    #$pattern .= '(?::\/\/|)';                              # Optional scheme.
    #$pattern .= '(?:www.|)';                               # Optional scheme. www.
    $pattern .=     '(' ; # start array[1]
    $pattern .=         '(?:' ;
    $pattern .=             'www\.|m\.|';                   #  Optional www subdomain.
    $pattern .=         ')' ;
    $pattern .=         '(?:';                              # Group host alternatives
    #$pattern .=            'youtu\.be\/';                  # Either youtu.be
    #$pattern .=            '|youtube\.com';                # youtube.com
    $pattern .=             '[^/]+';
    $pattern .=         ')'     ;
    $pattern .=     ')' ; # end   array[1] domain
    $pattern .=     '(' ; # start array[2] anchor

    /*
    $pattern .= '(?:/.+\#.+/|\/.*[?&]v=)';
    */
    $pattern .=         '(?:' ;
    #$pattern .=             '\/embed\/';                    # /embed
    #$pattern .=             '|\/v\/';                       # or /v
    $pattern .=             '|\/.+\/';                      # or /vi
    #$pattern .=            '|\/watch\?v=';                 # /watch?v=
    $pattern .=             '|\/.*[?&]v=';                  # or /watch?v=,
    $pattern .=             '|\/.*\?.+&v=';
    #$pattern .=            '|\/ytscreeningroom\?v=';       # /ytscreeningroom?v=
    #$pattern .=             '|\/feeds\/api\/videos\/';      # or either /feeds or /api or /videos
    #$pattern .=             '|\/user';                      # or /user
    $pattern .=             '\S*';                          # Allow anything upto “youtube VIDEO_ID”                (Note: 1a)
    $pattern .=             '[^\w\-\s]';                    # but char before “youtube VIDEO_ID” is non-id char     (Note: 2a)
    $pattern .=             '|\S*';                         # or Allow anything upto “youtube VIDEO_ID”             (Note: 1b)
    $pattern .=             '[^\w\-\s]';                    # but char before “youtube VIDEO_ID” is non-id char     (Note: 2b)
    /*
    */
    $pattern .=         ')';                                # End group path alternatives
    $pattern .=     ')'; # end array[2]

    $pattern .= '([\w\-]{11})';                             # “youtube VIDEO_ID” is exactly 11 chars # array[3]
    #$pattern .= '([\w\-]{12,})';                           # “youtube PLAYLIST_ID” is exactly 12 or more chars
    #$pattern .= '([a-z0-9;:@?&%=+\/\$_.-]*)';              # Strip out anything left in the url
    $pattern .= '(.*)';                                     # Strip out anything left in the url
    $pattern .= '~i';

    preg_match ( $pattern , $url , $matches ) ;
    return ( count ( $matches ) > 0 ) ? $matches : $url ;
    return (isset($matches[1])) ? $matches[1] : $url ;
    return (isset($matches[1])) ? $matches[1] : FALSE ;
}


# lets test it shall we ? :)
$urls = array(
    'https://www.youtube-nocookie.com/embed/kk5xfK0ovrk',
    'http://www.youtube.com/?feature=player_embedded&v=4heZkvPcd1M',
    'http://www.youtube.com/watch?v=4heZkvPcd1M&feature=c4-overview-vl&list=PLbzoR-pLrL6qucl8-lOnzvhFc2UM1tcZA',
    'https://www.youtube.com/watch?v=4heZkvPcd1M&list=RDFZu097wb8wUx',
    'http://www.youtube.com/watch?feature=player_embedded&v=4heZkvPcd1M',
    'http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/0/4heZkvPcd1M',
    'http://www.youtube.com/embed/4heZkvPcd1M',
    'http://www.youtube.com/user/username#p/u/11/4heZkvPcd1M',
    'http://youtube.com/vi/4heZkvPcd1M?feature=youtube_gdata_player',
    'http://www.youtube.com/v/4heZkvPcd1M',
    'http://www.youtube.com/e/4heZkvPcd1M',
    'http://www.youtube.com/p/4heZkvPcd1M',
    'http://www.youtube.com/?v=4heZkvPcd1M',
    'youtu.be/watch?v=4heZkvPcd1M',
    'youtube.com/watch?v=4heZkvPcd1M',
    'm.youtu.be/watch?v=4heZkvPcd1M',
    'm.youtube.com/watch?v=4heZkvPcd1M',
    'http://www.youtube.com/watch?v=4heZkvPcd1M',
    'http://www.m.youtube.com/watch?v=4heZkvPcd1M',
    'http://www.m.youtu.be/watch?v=4heZkvPcd1M',
    'http://youtu.be/4heZkvPcd1M',
    'https://youtu.be/4heZkvPcd1M',
    'youtu.be/watch?v=4heZkvPcd1M',
    'youtube.com/watch?v=4heZkvPcd1M',
    'https://youtu.be/4heZkvPcd1M',
    'https://www.youtube.com/embed/4heZkvPcd1M',
    'https://www.m.youtube.com/embed/4heZkvPcd1M',
    'http://youtu.be/4heZkvPcd1M',
    'http://www.youtube.com/embed/4heZkvPcd1M',
    'http://www.youtube.com/watch?v=4heZkvPcd1M',
    'http://www.youtube.com/watch?v=4heZkvPcd1M&feature=g-vrec',
    'http://www.youtube.com/watch?v=4heZkvPcd1M&feature=player_embedded',
    'http://www.youtube.com/v/4heZkvPcd1M?fs=1&hl=en_US',
    'http://www.youtube.com/ytscreeningroom?v=4heZkvPcd1M',
    'http://www.youtube.com/watch?NR=1&feature=endscreen&v=4heZkvPcd1M',
    'https://m.youtu.be/4heZkvPcd1M',
);

echo count ( $urls ). "\n";
foreach ( $urls as $url ) {
    var_dump ( parse_yturl ( $url ) ). "\n" ;
}