Detailed explanation of how PHP implements breakpoint resumption and file splitting sample code

To implement breakpoint resumable upload in php, you need to split the large file into multiple small files, and then upload a single . Merge after transmission.

The following is the sample code:

split.php split file script

<?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 merge file script

<?php
$filelist = glob(&#39;./split/*socket*.tmp&#39;);
$filesize = 10;

//print_r($filelist);
$mergeFileName = &#39;merg.zip&#39;;

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);

A complete implementation Code:

<?php 
ini_set("memory_limit", "50M");//必须的，根据你环境的实际情况尽量大，防止报错 
ini_set("max_execution_time", "100"); 
//file_exists() 函数检查文件或目录是否存在，存在则返回 true，否则返回 false。 
//fread() 函数读取文件（可安全用于二进制文件）。fread() 从文件指针 file 读取最多 length 个字节。 
//filesize() 函数返回指定文件的大小（字节）。本函数的结果会被缓存。请使用 clearstatcache() 来清除缓存。 
$orgFile = &#39;Fireworks8-chs.exe&#39;;//源文件 
$cacheFileName = &#39;vbcache&#39;;//分割成的临时文件块 
function cutFile($fileName,$block) {//分割 
global $cacheFileName; 
if (!file_exists($fileName)) return false; 
$num = 1; 
$file = fopen($fileName, &#39;rb&#39;); 
while ($content = fread($file,$block)) { 
$cacheFile = $cacheFileName . $num++ . &#39;.dat&#39;; 
$cfile = fopen($cacheFile, &#39;wb&#39;); 
fwrite($cfile, $content); 
fclose($cfile); 
} 
fclose($file); 
} 
function mergeFile($targetFile) {//合并 
global $cacheFileName; 
$num = 1; 
$file = fopen($targetFile, &#39;wb&#39;); 
while ($num > 0) { 
$cacheFile = $cacheFileName . $num++ . &#39;.dat&#39;; 
if (file_exists($cacheFile)) { 
$cfile = fopen($cacheFile, &#39;rb&#39;); 
$content = fread($cfile, filesize($cacheFile)); 
fclose($cfile); 
fwrite($file, $content); 
} 
else { 
$num = -1; 
} 
} 
fclose($file); 
} 
//调用 
cutFile($orgFile, 10 * pow(2,20)); //10 * pow(2,20) 就等于 10M pow() 函数返回 x 的 y 次方 
mergeFile(&#39;ok.exe&#39;); 
?>

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