PHP and Regular Expressions

Using regular expressions with php, webmasters have a great opportunity to grap information out of their sites. Our example reads out the title information given on a website and stores it in the variable $titelzeile. It could be used for an site-wide searchengine or to display the titles of the referring pages.

<?php
$woher = "http://www.computerhilfen.de/start.php";
$data = implode("", file($woher));
if (preg_match("/<title>(.*)<\/title>/i", $data, 
   $title)) { $titelzeile = $title[1]; }
?>

The website given in the variable $woher is read into $data. With the preg_match commando the skript searches for the title-tag and stores it in $titelzeile. The title can now be displayed with:

echo $titelzeile;