php parsing with dom

Using the SimpleHTMLDom Library:

<?php
    // include the SimpleHTMLDom library
    include('lib/simple_html_dom.php');

    // our input string
    $input = '<script type="text/javascript" src="http://website.com/?code-ajax&cd=1145040425"></script>';

    // create our Object. If reading from a file, use: file_get_html('/path/to/file');
    $doc = str_get_html($input);

    // find the first <script> tag, and echo its 'src' attribute.
    // -- note: calling this with find('script') returns an array
    echo $doc->find('script',0)->src;
?>

My favorite solution is simplehtmldom php library, it is alot simpler to use than PHP's native solution; I say this from experience. It's similar to jQuery in it's syntax and usage.

You may use it like this

include('lib/simple_html_dom.php');
$html = str_get_html('<script type="text/javascript" src="http://website.com/?code-ajax&cd=1145040425"></script>');
$scriptsrc = $html->find('script',0)->src;

$doc = new DOMDocument();
$doc->loadXML($xml);
$src = $doc->documentElement->getAttribute('src');

XPath example using remote file

$doc = new DOMDocument();
$doc->loadHTMLFile($url);
$xpath = new DOMXpath($doc);

// Retrieve collections of script nodes
$allScripts  = $xpath->query('//script');
$headScripts = $xpath->query('/html/head/script');
$bodyScripts = $xpath->query('/html/body/script');

// Get all scripts who's src attribute starts with "http://website.com"
$websiteScripts = $xpath->query('//script[starts-with(@src, "http://website.com")]');
if ($websiteScripts->length) {
    // contains one or more matches
    $src = $websiteScripts->item(0)->getAttribute('src');
}