Csv读写类

 <?php

 /**
  * CSV 文件读写类
  *
  * 示例:

 $header = array('name' => '名字', 'age' =>'年龄', 'idcard' => '身份证号');

 $data = array(
     array('age' => 12, 'name' => '李四', 'idcard' => '42088751564616131312'),
     (object) array('idcard' => '72888751564616131312', 'age' => 17, 'name' => '张三'),
 );

 Csv::instance()->open('e:/abc1.csv', true)->header($heaer)->create($data)->close();
 Csv::instance()->open()->header($header)->create($data)->download('用户数据.csv');

  */

 class Csv {

     public $header = array();

     public $fp = '';

     public static function instance(){

         return new static();
     }

     /**
      * 打开/创建文件
      * @param string $file
      * @param string $mode
      * @return $this
      */
     public function open($file = '',  $mode = 'a'){

         if(empty($file)){

             $this->fp = tmpfile();
         }else{
             if($mode === true) $mode = 'w+';
             $this->fp = fopen(iconv('UTF-8', 'GBK', $file), $mode);
         }

         return $this;

     }

     /**
      * 写入表头
      * @param $value
      * @return $this
      */
     public function header($value){

         $this->header = is_array($value)? $value : (array) $value;
         fputcsv($this->fp, array_values($this->header));

         return $this;
     }

     /**
      * 写入一行
      * @param $data
      * @return $this
      */
     public function write($data){

         if(is_string($data)){
             $data = json_decode($data, true);
         }else if(!is_array($data)){
             $data = json_decode(json_encode($data), true);
         }

         if(empty($data)) return $this;

         if($this->header){
             $column = array();
             foreach($this->header as $key => $value){
                 $column[$key] = isset($data[$key])? $data[$key] : 'NULL';
             }
             $data = &$column;
         }

         foreach($data as $key => &$value){
             if(is_numeric($value) && strlen($value) > 10){
                  $value .= "\t";
             }else if(!is_scalar($value)){
                 $value = json_encode($value, JSON_UNESCAPED_UNICODE);
             }

         }

         fputcsv($this->fp, $data);

         return $this;
     }

     /**
      * 读取一行
      * @param int $length
      * @param string $delimiter
      * @param string $enclosure
      * @param string $escape
      * @return array|false|null
      */
     public function read($length = 0, $delimiter = ',', $enclosure = '"', $escape = '\\'){

         return fgetcsv($this->fp, $length, $delimiter, $enclosure, $escape);
     }

     /**
      * 获取文件内容
      * @param null $callback
      * @param int $start
      * @param int $length
      * @return array
      */
     public function content($callback = null, $start = 1, $length = 0){

         if($start > 1){
             for($start; $start > 1; $start--){
                 $this->read(1);
             }
         }

         $data = array();
         $key = 0;
         while(($row = $this->read()) !== false){

             if($length < 0) break;
             if($length > 0) $length--;

             if(is_callable($callback)){
                 $row = $callback($row);
                 if($row === null) continue;
             }
             $data[$key] = $row;
             $key++;

         }

         return $data;
     }

     /**
      * 下载
      * @param $file
      */
     public function download($file){

         $file = iconv('UTF-8', 'GBK', $file);
         header('Content-Type:application/application/octet-stream');
         header("Content-Disposition:attachment;filename=$file");

         fseek($this->fp, 0);
         echo stream_get_contents($this->fp);

         $this->close();

     }

     /**
      * 快速写入文件
      * @param $data
      * @return $this
      */
     public function create($data){

         if(is_string($data)) $data = json_decode($data, true);
         foreach($data as $row){
             $this->write($row);
         }

         return $this;

     }

     public function close(){

         fclose($this->fp);
     }

 }