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Calculates the md5 hash of a given file
(PHP 4 >= 4.2.0, PHP 5, PECL hash:1.1-1.3)
Code Examples / Notes » md5_filepotsed
Heres a function to give an md5 for an entire directory.. function MD5_DIR($dir) { if (!is_dir($dir)) { return false; } $filemd5s = array(); $d = dir($dir); while (false !== ($entry = $d->read())) { if ($entry != '.' && $entry != '..') { if (is_dir($dir.'/'.$entry)) { $filemd5s[] = MD5_DIR($dir.'/'.$entry); } else { $filemd5s[] = md5_file($dir.'/'.$entry); } } } $d->close(); return md5(implode('', $filemd5s)); } richard
For those of you with PHP 4 that want to output the "raw" 128 bit hash, all you need to do is send it to pack to convert the hex string into the raw output. ie: $filename="checkthisfile.bin"; $rawhash=pack("H*",md5_file($filename)); bubba
a working example of the usage of this function, to confirm a specific file has not been modified (replace all instances of "myfile.xxx" with your filename): <?php $chkfilename = "myfile.xxx"; $chkmd5return = md5_file($chkfilename); if ($chkmd5return != "myfile.xxx's md5 value") { echo "You have replaced myfile.xxx with an unknown version of the file, please replace the original file."; } else { (your code to be executed, now that it has confirmed your myfile.xxx has been unmodified) } ?> To find out the file's md5 value, create a new .php doc, and put this code in it: <?php $chkfilename = "myfile.xxx"; $chkmd5return = md5_file($chkfilename); echo $chkmd5return; ?> Then upload the new .php doc to your webserver and navigate to it. Be sure to delete the new .php doc once you have plugged in the value it spits out, into the "myfile.xxx's md5 value" in the first example above. I just thought this example might be helpful to someone somewhere... if you php.net people feel it needs editing or deletion, I leave it to your discretion. ;) |
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