PHP implements folder difference comparison-PHP Tutorial-php.cn

How to implement folder difference comparison in php? This article mainly introduces the method of comparing the similarities and differences of two folders in PHP, involving PHP's recursive operation skills for directories and file names. I hope to be helpful.

The example in this article describes the method of comparing the similarities and differences of two folders in PHP. Share it with everyone for your reference. The specific analysis is as follows:

Requirements:

You can only use the command line to compare the differences between two folders, including file differences.

Thinking:

Although there is diff under linux. . . . Let’s use PHP. It’s easy to change the code and it’s fast. The following excludes the comparison of .svn directories.
Files need to be compared with md5 checksums.

Ideas:

1) Use the first path as the standard path and list the files or folders that are in the first path but not in the second path, or are different files.
2) Then, list the files and folders that exist in the second path but do not exist in the first path.

Call example:

php compare_folder.php /home/temp/2 /home/temp/55

The code is as follows:

 1 ) $dir1 = del_postfix($argv[1]); else $dir1 = '/'; if (count($argv) > 2 ) $dir2 = del_postfix($argv[2]); else $dir2 = '/'; //检查第一个路径有，后者没有或错误的方法。 process_compare($dir1, $dir2, 0); echo "===========================================================\n"; //检查第2个路径的多余文件夹或文件 process_compare($dir2 , $dir1, 1); echo "all OK\n"; /** * 去除路径末尾的/，并确保是绝对路径 * * @param unknown_type $dir * @return unknown */ function del_postfix($dir) { if (!preg_match('#^/#', $dir)) { throw new Exception('参数必须是绝对路径'); } $dir = preg_replace('#/$#', '', $dir); return $dir; } /** * 公用函数，会调用一个递归方法实现比较 * * @param string $dir1 作为标准的路径 * @param string $dir2 对比用的路径 * @param int $only_check_has 为1表示不比较文件差异，为0表示还要比较文件的md5校验和 */ function process_compare($dir1, $dir2, $only_check_has){ compare_file_folder($dir1, $dir1, $dir2, $only_check_has); } /** * 真实的函数，私有函数 * * @param string $dir1 路径1，是标准 * @param string $base_dir1 不变的参数路径2 * @param string $base_dir2 不变的待比较的路径2 * @param int $only_check_has 为1表示不比较文件差异，为0表示还要比较文件的md5校验和 * */ function compare_file_folder($dir1, $base_dir1, $base_dir2, $only_check_has=0){ if (is_dir($dir1)) { $handle = dir($dir1); if ($dh = opendir($dir1)) { while ($entry = $handle->read()) { if (($entry != ".") && ($entry != "..") && ($entry != ".svn")){ $new = $dir1."/".$entry; //echo 'compare: ' . $new . "\n"; $other = preg_replace('#^'. $base_dir1 .'#' , $base_dir2, $new); if(is_dir($new)) { //比较 if (!is_dir($other)) { echo '!!not found direction: '. $other. ' (' . $new .")\n"; } compare_file_folder($new, $base_dir1,$base_dir2, $only_check_has) ; } else { //如果1是文件，则2也应该是文件 if (!is_file($other)) { echo '!!not found file: '. $other. ' ('.$new .")\n"; }elseif ($only_check_has ==0 && ( md5_file($other) != md5_file($new) ) ){ echo '!!file md5 error: '. $other. ' ('.$new .")\n"; } } } } closedir($dh); } } } ?>

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