这是个非常有用的程序，可以对文本文件进行特定的搜索，并以特定的文字替换指定的文字，举个例子说如果我这篇文章里有一个字全部打错了，有几十处，要一一找出来修改是件很麻烦的事，用下面这个就可以轻松搞定。--teaman.oso.com.cn 类文件 search_replace.inc <?php         class search_replace{                 var $find;                 var $replace;                 var $files;                 var $directories;                 var $include_subdir;                 var $ignore_lines;                 var $ignore_sep;                 var $occurences;                 var $search_function;                 var $last_error;         //以下进行函数定义和设置                           function search_replace($find, $replace, $files, $directories = ', $include_subdir = 1, $ignore_lines = array()){                         $this->find            = $find;                         $this->replace         = $replace;                         $this->files           = $files;                         $this->directories     = $directories;                         $this->include_subdir  = $include_subdir;                         $this->ignore_lines    = $ignore_lines;                         $this->occurences      = 0;                         $this->search_function = 'search';                         $this->last_error      = ';                 }         /***************************************         ** Accessor for retrieving occurences.         ***************************************/                 function get_num_occurences(){                         return $this->occurences;                 }         //获取最后的错误                 function get_last_error(){                         return $this->last_error;                 }         //设置FIND变量                 function set_find($find){                         $this->find = $find;                 }         //设置replace变量                 function set_replace($replace){                         $this->replace = $replace;                 }         //设置FILE变量                 function set_files($files){                         $this->files = $files;                 }         //设置目录变量                 function set_directories($directories){                         $this->directories = $directories;                 }         //设置目录变量 set_include_subdir                 function set_include_subdir($include_subdir){                         $this->include_subdir = $include_subdir;                 }         //设置ignore_lines变量                 function set_ignore_lines($ignore_lines){                         $this->ignore_lines = $ignore_lines;                 }         //确定是哪一种搜索方式                 function set_search_function($search_function){                         switch($search_function){                                 case 'normal': $this->search_function = 'search';                                                return TRUE;                                                break;                                 case 'quick' : $this->search_function = 'quick_search';                                                return TRUE;                                                break;                                 case 'preg'  : $this->search_function = 'preg_search';                                                return TRUE;                                                break;                                 case 'ereg'  : $this->search_function = 'ereg_search';                                                return TRUE;                                                break;                                 default      : $this->last_error      = 'Invalid search function specified';                                                return FALSE;                                                break;                         }                 }         //以下为搜索和替换程序的主文件                 function search($filename){                         $occurences = 0;                         $file_array = file($filename);                         for($i=0; $i<count($file_array); $i++){                                 $continue_flag = 0;                                 if(count($this->ignore_lines) > 0){                                         for($j=0; $j<count($this->ignore_lines); $j++){                                                 if(substr($file_array[$i],0,strlen($this->ignore_lines[$j])) == $this->ignore_lines[$j]) $continue_flag = 1;                                         }                                 }                                 if($continue_flag == 1) continue;                                 $occurences += count(explode($this->find, $file_array[$i])) - 1;                                 $file_array[$i] = str_replace($this->find, $this->replace, $file_array[$i]);                         }                         if($occurences > 0) $return = array($occurences, implode(', $file_array)); else $return = FALSE;                         return $return;                 }         //使用quick(快速)搜索方法时，没有igonre_lines功能                 function quick_search($filename){                         clearstatcache();                         $file       = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);                         $occurences = count(explode($this->find, $file)) - 1;                         $file       = str_replace($this->find, $this->replace, $file);                         if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;                         return $return;                 }         //preg搜索方法不支持ignore_lines                 function preg_search($filename){                         clearstatcache();                         $file       = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);                         $occurences = count($matches = preg_split($this->find, $file)) - 1;                         $file       = preg_replace($this->find, $this->replace, $file);                         if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;                         return $return;                 }         //ereg搜索方法也不支持ignore_lines                 function ereg_search($filename){                         clearstatcache();                         $file = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);                         $occurences = count($matches = split($this->find, $file)) -1;                         $file       = ereg_replace($this->find, $this->replace, $file);                         if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;                         return $return;                 }         //写新文件                 function writeout($filename, $contents){                         if($fp = @fopen($filename, 'w')){                                 fwrite($fp, $contents);                                 fclose($fp);                         }else{                                 $this->last_error = 'Could not open file: '.$filename;                         }                 }         //由do_search调用，排出所有要搜索的文件                 function do_files($ser_func){                         if(!is_array($this->files)) $this->files = explode(',', $this->files);                         for($i=0; $i<count($this->files); $i++){                                 if($this->files[$i] == '.' OR $this->files[$i] == '..') continue;                                 if(is_dir($this->files[$i]) == TRUE) continue;                                 $newfile = $this->$ser_func($this->files[$i]);                                 if(is_array($newfile) == TRUE){                                         $this->writeout($this->files[$i], $newfile[1]);                                         $this->occurences += $newfile[0];                                 }                         }                 }         //由do_search()调用，排出所有要搜索的目录                 function do_directories($ser_func){                         if(!is_array($this->directories)) $this->directories = explode(',', $this->directories);                         for($i=0; $i<count($this->directories); $i++){                                 $dh = opendir($this->directories[$i]);                                 while($file = readdir($dh)){                                         if($file == '.' OR $file == '..') continue;                                         if(is_dir($this->directories[$i].$file) == TRUE){                                                 if($this->include_subdir == 1){                                                         $this->directories[] = $this->directories[$i].$file.'/';                                                         continue;                                                 }else{                                                         continue;                                                 }                                         }                                         $newfile = $this->$ser_func($this->directories[$i].$file);                                         if(is_array($newfile) == TRUE){                                                 $this->writeout($this->directories[$i].$file, $newfile[1]);                                                 $this->occurences += $newfile[0];                                         }                                 }                         }                 }         //调用这个do_search()就可以开始对文件或目录进行搜索                 function do_search(){                         if($this->find != '){                                 if((is_array($this->files) AND count($this->files) > 0) OR $this->files != ') $this->do_files($this->search_function);                                 if($this->directories != ')                                       $this->do_directories($this->search_function);                         }                 }         } // End of class ?> //下面是调用该类的例子说明,请存为example.php <?php         include('search_replace.inc');  //将文件包括进来 //建立新物件，设置搜索条件、最后返回搜索结果         $sr = new search_replace('asp', 'php', array('test.txt')); //调用搜索与替换         $sr->set_search_function('quick');   //设置搜索条件         $sr->do_search();         $sr->set_find('another');         $sr->do_search(); //下面是定制的返回信息         header('Content-Type: text/plain');         echo '发现和替换以下几个地方: '.$sr->get_num_occurences()." ";         echo '啊，错误发生如下.............: '.$sr->get_last_error()." "; ?> //将以下文字存为test.txt,注意text.txt必须是可读可写的 "我非常喜欢asp,它简单易学，功能强，听说asp已经占了大半市场，asp真好。" 此时，如果您打开exampe.php 就会出现下面这些： 发现和替换以下几个地方:3 啊，错误发生如下..........:       查看test.txt文件，果然出现asp的地方被php替换了。