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php实现比较两个文件夹异同的方法,

本文实例讲述了php实现比较两个文件夹异同的方法。分享给大家供大家参考。具体分析如下:

要求:

只能使用命令行,比较两个文件夹的不同,包括文件的差异。

思考:

虽然linux下有diff。。。。还是用php吧,代码改的方便,速度也很快,以下排除了.svn目录的比较
文件要比较md5校验和

思路:

1)把第一路径作为标准路径,列出第1个路径中有的,第2个路径中没有的文件或文件夹,或者是不同的文件。
2)然后,列出第2个路径中有的,第1个路径中却不存在的文件和文件夹。

调用示例:

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

代码如下:

<&#63;php 
/** 
 * 工具文件 
 * 目的在于递归比较两个文件夹 
 * 
 * 调用示例 
 * php compare_folder.php /home/temp/2 /home/temp/55 
 * 
 */ 
//参数确定 
if (count($argv) > 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); 
  } 
 } 
} 
&#63;>

希望本文所述对大家的php程序设计有所帮助。

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