How to get the md5 sequence value of a directory in PHP

This article introduces the method of using PHP code to obtain the md5 sequence value of a directory, and shares a piece of code for the reference of friends in need.

PHP Gets the md5 sequence value of a directory. Code:

<?php
/**
 * 获取目录的 md5 序列值
 * @param string $dir 目录路径
 * @return string
 * @site bbs.it-home.org
 */
if ( ! function_exists('md5_folder'))
{
 function md5_folder ($dir) {

  if (!is_dir($dir)) {
   return false;
  }

  $filemd5s = array();
  $d = dir($dir);

  while (false !== ($entry = $d->read())) {
   if ($entry != '.' && $entry != '..' && $entry != '.svn') {
    if (is_dir($dir.'/'.$entry)) {
     $filemd5s[] = md5_folder($dir.'/'.$entry);
    } else {
     $filemd5s[] = md5_file($dir.'/'.$entry);
    }
   }
  }
  $d->close();
  return md5(implode('', $filemd5s));
 }
}
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?>