<?php $str = '<p>Hello World!</p><p style="text-align:center"><img src="foo.png" /><br /></p>';
Standard input is empty
Array
(
[0] => <p>Hello World!</p>
[1] => <p style="text-align:center">
[2] => <img src="foo.png" />
[3] => <br />
[4] => </p>
)