How to intercept the content of a web page using PHP

For example, the URL we want to obtain is: http://www.codes51.com

The code is as follows:

 <br>
<? <br />
$urlfile=file("<span>http://www.codes51.com</span>"); <br />
$count=count($<span>urlfile</span>); <br />
<br />
for($i=0;$i<$count;$i++){ <br />
if(eregi("<title>(.*)</title>",$<span>urlfile</span>[$i],$out)){ <br>
$title=$out[0]; <br>
} <br>
} <br>
$title=substr($title,7,-8); <br>
echo $title; <br>
?> <br>

The above introduces the method of using PHP to intercept the content of web page , including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.