- var_dump: documentation ( source)
<?php
$html = '<div><iframe style="display: block; margin-left: auto; margin-right: auto;" src="https://www.youtube.com/embed/miE64ZdLwzE" frameborder="0" width="420" height="315"></iframe><br /> <iframe src="http://www.youtube.com/embed/gNOJWXjrNIE?wmode=transparent" frameborder="0" width="500" height="320"></iframe><br /> <br /> <span style="font-size: large;"><strong><span style="color: #0000ff;">測試影片2<br /> <iframe src="http://www.youtube.com/embed/F2uX6ByoW7A?wmode=transparent" frameborder="0" width="500" height="320"></iframe><br /><br /><br />eeeeeee</span></strong></span></div>';
$html = tidy_repair_string($html);
var_dump($html);