PHP: www-filesize

7 Feb, 2004  Technical

To get the filesize of a file that isn’t located on your own server is not such
an easy thing! There’s this nice function in PHP to get the size of your files,
filesize() – but it just works for local files.

This workaround should work. – kinda slow, as you need to make a connection to the
remote host, but that’s probably the only way to do it:

sample usage:

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$url = "http://www.your.url/file.zip";
$size = getRemoteSize($url); // filesize in bytes
echo (round(abs($size)/1024)).' kb';
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/**
* Gets the filesize of a remotely located file
*
* @access   public
* @param    string    $url     URL to file
* @return   integer            filesize in bytes
*/
function getRemoteSize($url) {
$parsedUrl = parse_url($url);
$host = $parsedUrl['host'];
$path = $parsedUrl['path'];
$ourhead = '';
 
$fp = fsockopen($host, 80, $errno, $errstr, 20);
if(!$fp) {
exit("$errstr ($errno)
\n");
} else {
$out  = "HEAD $url HTTP/1.1\r\n";
$out .= "HOST: dummy\r\n";
$out .= "Connection: close\r\n\r\n";
 
fputs($fp,$out);
while (!feof($fp)) {
$ourhead = sprintf("%s%s", $ourhead, fgets ($fp,128));
}
}
fclose($fp);
$split1 = explode("content-length: ", strtolower($ourhead));
if(!@$split1[1]) exit('Error: No content length');
$split2 = explode("\r\n", $split1[1]);
$size = (int) $split2[0]; // size in bytes
 
return $size;
}

I’ve written a full-featured static class which is able to determine the filesize of either a local file, a remote file or the recursive size of a local directory:
Sd_FileSize.class.php
Use getSize() for byte retrieval and getSizeHuman() for human readable size strings.

sample usage:

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include_once('Sd_FileSize.class.php');
echo Sd_FileSize::getSizeHuman('file.zip')
echo Sd_FileSize::getSizeHuman('directory/test');
echo Sd_FileSize::getSizeHuman('http://www.example.com/file.zip');

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