PHP实现断点续传乱序合并文件的方法

<?php
$fileTotaiSize = filesize("socket.zip");
$filelist = glob('./split/*socket*.tmp');
$filesize = 3096;
//打乱读取文件顺序
shuffle($filelist);
$mergeFileName = 'merg2.zip';
 if(is_file($mergeFileName))
 {
 unlink($mergeFileName);
 }
 $fp2 = fopen($mergeFileName,"w+");
 //创建空白文件
 $str = str_pad('',$fileTotaiSize);
 fwrite($fp2, $str, $fileTotaiSize);
foreach($filelist as $k => $v)
{
 $tmp = explode('.',$v);
 $len = explode('-', $tmp[3]);
 $offset = (int) $len[0];
 $fp = fopen($v, "rb");
 $content = fread($fp, $filesize);
  echo $offset, "\n";
  fseek($fp2, $offset);
  fwrite($fp2, $content, strlen($content));
  unset($content);
  fclose($fp);
}
fclose($fp2);

<?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);