$fp = fopen($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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