How to write code to display youtube video thumbnails and Vimeo video thumbnails

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The copy code is as follows:

Function video_image ($url) {

$image_url = parse_url ($url)

If ($image_url ['host'] = =' www.youtube.com' | |

$image_url ['host'] = =' youtube.com') {

$array = explode ("&", $image_url ['query'])

Return "http://img.youtube.com/vi/".substr($array[0], 2)." / 0.jpg "

} else if ($image_url ['host'] = =' www.youtu.be' | |

$image_url ['host'] = =' youtu.be') {

$array = explode ("/", $image_url ['path'])

Return "http://img.youtube.com/vi/".$array[1]."/0.jpg";

} else if ($image_url ['host'] = =' www.vimeo.com' | |

$image_url ['host'] = =' vimeo.com') {

$hash = unserialize (file_get_contents ("http://vimeo.com/api/v2/video/".)

Substr ($image_url ['path'], 1) .php))

Return $hash [0] ["thumbnail_medium"]

}

}