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    <p>Found something about this <a href="http://php.net/manual/en/function.filesize.php#92462" rel="noreferrer">here</a>:</p> <blockquote> <p>Here's the best way (that I've found) to get the size of a remote file. Note that HEAD requests don't get the actual body of the request, they just retrieve the headers. So making a HEAD request to a resource that is 100MB will take the same amount of time as a HEAD request to a resource that is 1KB.</p> </blockquote> <pre><code>&lt;?php /** * Returns the size of a file without downloading it, or -1 if the file * size could not be determined. * * @param $url - The location of the remote file to download. Cannot * be null or empty. * * @return The size of the file referenced by $url, or -1 if the size * could not be determined. */ function curl_get_file_size( $url ) { // Assume failure. $result = -1; $curl = curl_init( $url ); // Issue a HEAD request and follow any redirects. curl_setopt( $curl, CURLOPT_NOBODY, true ); curl_setopt( $curl, CURLOPT_HEADER, true ); curl_setopt( $curl, CURLOPT_RETURNTRANSFER, true ); curl_setopt( $curl, CURLOPT_FOLLOWLOCATION, true ); curl_setopt( $curl, CURLOPT_USERAGENT, get_user_agent_string() ); $data = curl_exec( $curl ); curl_close( $curl ); if( $data ) { $content_length = "unknown"; $status = "unknown"; if( preg_match( "/^HTTP\/1\.[01] (\d\d\d)/", $data, $matches ) ) { $status = (int)$matches[1]; } if( preg_match( "/Content-Length: (\d+)/", $data, $matches ) ) { $content_length = (int)$matches[1]; } // http://en.wikipedia.org/wiki/List_of_HTTP_status_codes if( $status == 200 || ($status &gt; 300 &amp;&amp; $status &lt;= 308) ) { $result = $content_length; } } return $result; } ?&gt; </code></pre> <p>Usage:</p> <pre><code>$file_size = curl_get_file_size( "http://stackoverflow.com/questions/2602612/php-remote-file-size-without-downloading-file" ); </code></pre>
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    1. COi was reading that earlier, wasn't sure if content-length meant the length or file size
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    2. COwell if the request returns a file, the request size *is* the file size
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    3. COBut keep in mind that there _can_ be responses without Content-length.
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