getting youtube video id the PHP

Like this:

$link = "http://www.youtube.com/watch?v=oHg5SJYRHA0";
$video_id = explode("?v=", $link);
$video_id = $video_id[1];

Here is universal solution:

$link = "http://www.youtube.com/watch?v=oHg5SJYRHA0&lololo";
$video_id = explode("?v=", $link); // For videos like http://www.youtube.com/watch?v=...
if (empty($video_id[1]))
    $video_id = explode("/v/", $link); // For videos like http://www.youtube.com/watch/v/..

$video_id = explode("&", $video_id[1]); // Deleting any other params
$video_id = $video_id[0];

Or just use this regex:

(\?v=|/v/)([-a-zA-Z0-9]+)

<?php
$your_url='https://www.youtube.com/embed/G_5-SqD2gtA';
function get_youtube_id_from_url($url)
{
    if (stristr($url,'youtu.be/'))
        {preg_match('/(https:|http:|)(\/\/www\.|\/\/|)(.*?)\/(.{11})/i', $url, $final_ID); return $final_ID[4]; }
    else 
        {@preg_match('/(https:|http:|):(\/\/www\.|\/\/|)(.*?)\/(embed\/|watch.*?v=|)([a-z_A-Z0-9\-]{11})/i', $url, $IDD); return $IDD[5]; }
}

echo get_youtube_id_from_url($your_url)
?>

Try:

function youtubeID($url){
     $res = explode("v",$url);
     if(isset($res[1])) {
        $res1 = explode('&',$res[1]);
        if(isset($res1[1])){
            $res[1] = $res1[0];
        }
        $res1 = explode('#',$res[1]);
        if(isset($res1[1])){
            $res[1] = $res1[0];
        }
     }
     return substr($res[1],1,12);
     return false;
 }
$url = "http://www.youtube.com/watch/v/y40ND8kXDlg";
echo youtubeID($url1);

Should work for both