php在操作断点续传时文件如何分割合并

php实现断点续传，就需要把大文件分割成多个小文件，然后单个上传。传完后在合并。

│ merge.php –合并文件脚本?
│ merge.zip –合并后文件?
│ socket.zip –需要分割的文件?
│ split.php –分割文件脚本?
│?
└─split –分割后小文件目录

下面是源码

split.php

	 $fp?=?fopen("socket.zip",?"rb");
$filesize?=?10;
$i?=?0;
$no?=?1; while(!feof($fp))
{
??$file?=?fread($fp,?$filesize);

??$fp2?=?fopen("./split/socket.port".sprintf("%04d",$no).".".$i."-".($i+$filesize).".tmp",?"wb");
??fwrite($fp2,?$file,?$filesize);
??fclose($fp2);
??$i+=$filesize+1;
$no++;
}

fclose($fp); 

merge.php

	 $filelist?=?glob('./split/*socket*.tmp');
$filesize?=?10; //print_r($filelist); $mergeFileName?=?'merg.zip';

unlink($mergeFileName);
??$fp2?=?fopen($mergeFileName,"w+"); foreach($filelist?as?$k?=>?$v)
{
??$fp?=?fopen($v,?"rb");
???$content?=?fread($fp,?$filesize);

???fwrite($fp2,?$content,?$filesize);
???unset($content);
???fclose($fp);
???echo?$k,"\n";
}
??fclose($fp2)