PHP文件处理类

 /**
  * 文件读写类
  * 读取时,支持跳过N个/行字符然后再读取M个/行字符
  * 支持每次读取时使用回调函数
  *
  * 示例:
  * $file = new File('a.txt', 'r');
  *
  * $data = $file->limit(0, 10)->getLine(function($line){
  *         return  $line . ' <br/>';
  * });
  * print_r($data);
  * $file->close();
  *
  */

 class File {

     protected $fp = null;
     protected $file = null;
     protected $limit = [0, 0];

     public function __construct($file, $mode = 'r'){

         $this->file = $file;
         $this->fp = fopen($file, $mode);

     }

     public function limit($start, $line = 0){

         if(func_num_args() == 1){
             $line = $start; $start = 0;
         }
         $this->limit = [$start, $line];
         return $this;
     }

     /**
      * 增加对文件函数的直接调用
      * @param string $method
      * @param mixed $args
      * @return mixed
      */
     public function __call($method, $args){

         array_unshift($args, $this->fp);
         return call_user_func_array($method, $args);
     }

     /**
      * 读取文件按行
      * @param function $func
      * @param $read 读取方式
      * @param $args 参数列表
      * @return mixed
      */
     public function readLine($func = null, $read = null, $args = []){

         $data = array();
         $opt = array('char'=>'fgetc', 'line'=>'fgets', 'csv'=>'fgetcsv');
         $read = (isset($opt[$read]))? $opt[$read] : 'fgets';
         array_unshift($args, $this->fp);

         //跳过字符数或行数
         if($this->limit[0] !== 0){
             for($i = 0; $i < $this->limit[0]; $i++){
                 if(call_user_func_array($read, $args) === false){
                     return $data;
                 }
             }
         }

         if($this->limit[1] > 0){
             //读取有效行数
             for($i = 0; $i < $this->limit[1]; $i++){

                 if(($buffer = call_user_func_array($read, $args)) === false){
                     return $data;
                 }
                 if(is_callable($func)){
                     $buffer = $func($buffer);
                     if($buffer !== null) $data[] = $buffer;
                 }else{
                     $data[] = $buffer;
                 }
             }    

         }else{
             //读取所有行数
             while(($buffer = call_user_func_array($read, $args)) !== false){
                 if(is_callable($func)){
                     $buffer = $func($buffer);
                     if($buffer !== null) $data[] = $buffer;
                 }
             }
         }
         $this->setHome();
         return $data;

     }

     /**
      * 读取文件按字符
      * @param function $func
      * @return mixed
      */
     public function getChar($func = null){
         return implode('', $this->readLine($func, 'char'));

     }

     /**
      * 读取文件按行
      * @param int $length
      * @param function $func
      * @return mixed
      */
     public function getLine($func = null, $length = 1024){

         if(is_numeric($func)){
             $length = $func; $func = null;
         }
         return $this->readLine($func, 'line', [$length]);
     }

     /**
      * 读按行取csv文件
      * @param unknown $func
      * @param number $length
      * @param string $delimiter
      */
     public function getCsv($length = 0, $delimiter = ','){
         return $this->readLine($func, 'csv', [$length, $delimiter]);
     }

     /**
      * 读取文件按字节
      * @param number $length
      * @return string
      */
     public function read($length = 0){

         if(empty($length)) $length = filesize($this->file);
         return fread($this->fp, $length);
     }

     /**
      * 写入文件
      * @param unknown $string
      * @param unknown $length
      * @return number
      */
     public function write($string, $length = null){
         return fwrite($this->fp, $string, $length);
     }

     /**
      * 写入csv文件
      * @param unknown $data
      * @param string $delimiter
      * @return boolean
      */
     public function putCsv($data, $delimiter = ','){

         foreach($data as $row) {
             fputcsv($fp, $row);
         }
     }

     /**
      * 获取文件资源指针
      * @return resource
      */
     public function getfp(){
         return $this->fp;
     }

     /**
      * 获取当前头文件指针位置
      * @return number
      */
     public function getSeek(){
         return ftell($this->fp);
     }

     /**
      * 文件指针定位到开头
      * @return boolean
      */
     public function setHome(){
         return rewind($this->fp);
     }

     /**
      * 文件指针定位到结尾
      * @return number
      */
     public function setEnd(){
         return fseek($this->fp, 0, SEEK_END);
     }

     /**
      * 设置文件指针位置
      * @param unknown $offset
      * @param string $whence
      * @return number
      */
     public function setSeek($offset, $whence = SEEK_SET){
         return fseek($this->fp, $offset, $whence);
     }

     /**
      * 关闭文件指针
      * @return boolean
      */
     public function close(){
         return fclose($this->fp);
     }

     public static function getSql($file, $isarray = false){

         $content = preg_replace(['/[\r|\n]+\s?(((--\s+|#).*)|\/\*(.|\n)*\*\/)/', '/[\r|\n]+/'], '', file_get_contents($file));
         if($isarray) $content = array_filter(explode(';', $content));
         return $content;
     }

 }