php - How to find for a string in html code -


i trying find string html section

example

<div class="container" data-id="youtube" style="height:100%;width:100%;border:none;"> <div class="inner"></div>

generally find string using 

if(strpos($string,"youtube") !== false)

but sample test trying store html code php variable

$string="<div class="container" data-id="youtube" style="height:100%;width:100%;border:none;">     <div class="inner"></div>";

when try find youtube in $string , returns false(does not exist)

can me find string in html code thank you

i made simple test you....it's working on localhost:

<?php      $string="<div class='container' data-id='youtube' style='height:100%;width:100%;border:none;'><div class='inner'></div>";     $search = "youtube";     if(strpos($string, $search) !== false)     {         echo "found";     }     else     {         echo "not found";     }      ?>

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