Replace part of array

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PHP

Hi,

I have some text: <iframe width="853" height="480" src="http://www.youtu....

I know how to replace width="857" to width="720", but my method is static(substr_replace($source, '720', 16, 3)).

If width="857" will have some other position in text, my method work horrible.

At php.net I found -

function array_replace_fun($a, $tofind, $toreplace) 
 { 
     $i = array_search($tofind, $a); 
     if ($i === false)
     { 
         return $a;
     } 
     else 
     { 
         $a[$i] = $toreplace; 
         return array_replace($a, $tofind, $toreplace);
     } 
 }

but function don't work.