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[web] check for 404 in php

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No. When you're in a script it means by definition that it has been found. Of course, you can emit a 404 inside a php script with the header() command.

What you can do is have Apache load a php file when it detects a 404. E.g:

ErrorDocument 404 /404.php

Most webhosts allow you to specify custom error documents using the control panel.

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However, if you mean checking the status of an external url, you can do this with the cURL extension.

$url = 'http://urltocheck';

$c = curl_init($url);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($c, CURLOPT_NOBODY, 1);
curl_setopt($c, CURLOPT_HEADER, 1);
$link_headers = curl_exec($c);
$info = curl_getinfo($c);

// $info['http_code'] should contain the response code of $url

Additionally, $link_headers will have all the headers of $url in it.

Hope this helps, if thats what you were looking for.

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