{source}
<?php
$url = 'https://www.youtube.com/channel/UCeUWl3fHaaY2-5vMoU7t72Q';
$contents = file_get_contents($url);
preg_match_all("#\s(?:href|src|url)=(?:[\"\'])?([^'\"]+)['\"]\s*(?:title=['\"]([^'\"]+)['\"])?\s*>((?:(?!</a>).)*)#i",$contents,$title);

$array_video = array();
$count = 0;
$total = 9;
$last_id = '';
foreach ($title[0] as $video) {
if(strstr($video,'/watch?v=')){
$video_id = explode('">',str_replace('href="/watch?v=','',$video));
if($last_id!=$video_id){
$array_video[] = '<a href="https://www.youtube.com/watch?v='.trim($video_id[0]).'" id="youtube_link">
<div id="youtube_frame">
<img src="http://img.youtube.com/vi/'.trim($video_id[0]).'/0.jpg" id="youtube_img">
<span id="youtube_title">'.$video_id[1].'</span>
</div>
</a>';
$count++;
$last_id = $video_id[0];
if($count==$total){
break;
}
}
}
}

echo '<div id="slider">
<ul class="slides">';
for($i=0; $i<count($array_video); $i++) {
if($i % 3 == 0){
echo '<li class="slide"><div class="box">';
}
echo $array_video[$i];
if($i % 3 == 2){
echo '</div></li>';
}
}
echo ' </ul>
</div>';
?>
{/source}