html - How to pull out a src value and parse out a ID number with php -

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im using wordpress , pass custom field through. data ends looking this, different urls sometimes:

$embed = '<iframe width="560" height="315" src="//www.youtube.com/embed/abcde12345" frameborder="0" allowfullscreen></iframe>'

i wondering how can pull src value out , how store text bolded below within url.

src="//www.youtube.com/embed/abcde12345"

i did search , saw people recommended using eval() tried reading , couldn't understand documentation. 

$src = array(); preg_match('(src="//www.youtube.com/embed/(.*?)")e', $embed, $src); echo $src[1];

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