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    <p>No need to use CURL, <code>file_get_contents($url);</code> will return false if the request fails (any other HTTP code other than 2xx), which might be more useful for what you're trying to do, an example:</p> <pre><code>function urlExists($url) { return (bool) @file_get_contents($url); } </code></pre> <p>Will return true if the URL returns useful content, false otherwise.</p> <hr> <p><strong>EDIT</strong>: Here is a faster way (it only requests the headers) and <strong>the first byte</strong> instead of the whole page:</p> <pre><code>function urlExists($url) { return (bool) @file_get_contents($url, false, null, 0, 1); } urlExists('https://stackoverflow.com/iDontExist'); // false </code></pre> <hr> <p>However, in combination with <a href="https://stackoverflow.com/questions/2719098/using-php-to-determine-if-a-remote-file-has-been-replaced">your other question</a> it may be wiser to use something like this:</p> <pre><code>function url($url) { return @file_get_contents($url); } $content = url('https://stackoverflow.com/'); // request has failed (404, 5xx, etc...) if ($content === false) { // delete or store as "failed" in the DB } // request was successful else { $hash = md5($content); // md5() should be enough but you can also use sha1() // store $hash in the DB to keep track of changes } </code></pre> <p>Or if you're using PHP 5.1+ you only have to do:</p> <pre><code>$hash = @md5_file($url); </code></pre> <p><code>$hash</code> will be false when the URL fails to load, otherwise it will return the MD5 hash of the contents.</p> <p>Graciously <a href="https://stackoverflow.com/questions/2719098/using-php-to-determine-if-a-remote-file-has-been-replaced/2719129#2719129">stolen from @Jamie</a>. =)</p> <p>This way you only have to make one request instead of two. =)</p>
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    1. POAutomated URL checking from a MySQL table
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    1. COSorry for the late late response. Been a bit busy. Thanks a lot, @md5_file(); is great. Can you tell me though, what is the '@' in front of the function for?
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    2. CORob: Is to avoid the function for throwing errors if the url fails to load.
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    3. COSo if I put that in my curl_multi_exec (as in @curl_multi_exec();), it will run all the urls regardless of errors? (See my open question for more information)
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