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Homephp教程php手册PHP 文件的分割

$fp = fopen($source_file,'rb')//打开源文件

 if(fseek($fp,$l*$start) == 0)//查找文件的起始位置
 {
  $tmp = fread($fp,$l*($end-$start));//读取文件内容
  fclose($fp);
  if(!$purpose = fopen($purpose_file,'a'))//打开目标文件
   echo "不能打开目标文件";
  fwrite($purpose,$tmp);//写入
  fclose($purpose);
}



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