parser.php

<?php
$goodhttpcodes = array(200,202,301,302,304);
$data = json_decode(file_get_contents('compress.zlib://http://api.stackoverflow.com/1.1/answers?body=true'));
foreach($data->answers as $answer) {
	if(preg_match_all("|<a.*(?=href=\"([^\"]*)\")[^>]*>([^<]*)</a>|i", $answer->body, $matches)) {
		foreach( $matches as $link ) {
			$handle = curl_init($link[0]);
			curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);
			$response = curl_exec($handle);
			$httpcode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
			if(!in_array($httpcode, $goodhttpcodes) {
				echo "dead link on ". $answer->answer_id .": " . $link[0] . "<br>";
			}
			curl_close($handle);
		}
	}
}