本文实例讲述了php+resumablejs实现的分块上传 断点续传功能。分享给大家供大家参考，具体如下：
resumablejs官网 http://www.resumablejs.com/
本站下载地址。
upload.html
<!doctype html>
<html lang="en">
<div>
<a href="#" rel="external nofollow" id="browsebutton" >select files</a>
<div>
<div>
<input id="btncancel" type="button" onclick='r.pause()'value="cancel all uploads"
style="margin-left: 2px; height: 22px; font-size: 8pt;" />
<br />
</div>
<script src="resumable.js"></script>
<script>
var r = new resumable({
target:'upload.php',
chunksize:2*1024*1024,
simultaneousuploads:4,
testchunks:true,
throttleprogresscallbacks:1,
});
r.assignbrowse(document.getelementbyid('browsebutton'));
r.on('filesuccess', function(file){
// console.debug(file);
});
r.on('fileprogress', function(file){
// console.debug(file);
});
r.on('fileadded', function(file, event){
r.upload();
//console.debug(file, event);
});
r.on('fileretry', function(file){
//console.debug(file);
});
r.on('fileerror', function(file, message){
//console.debug(file, message);
});
r.on('uploadstart', function(){
//console.debug();
});
r.on('complete', function(){
//console.debug();
});
r.on('progress', function(){
//console.debug();
});
r.on('error', function(message, file){
//console.debug(message, file);
});
r.on('pause', function(file,message){
//console.debug();
});
r.on('cancel', function(){
//console.debug();
});
</script>
</html>
upload.php
<?php
/**
* this is the implementation of the server side part of
* resumable.js client script, which sends/uploads files
* to a server in several chunks.
*
* the script receives the files in a standard way as if
* the files were uploaded using standard html form (multipart).
*
* this php script stores all the chunks of a file in a temporary
* directory (`temp`) with the extension `_part<#chunkn>`. once all
* the parts have been uploaded, a final destination file is
* being created from all the stored parts (appending one by one).
*
* @author gregory chris (http://online-php.com)
* @email www.online.php@gmail.com
*/
////////////////////////////////////////////////////////////////////
// the functions
////////////////////////////////////////////////////////////////////
/**
*
* logging operation - to a file (upload_log.txt) and to the stdout
* @param string $str - the logging string
*/
function _log($str) {
// log to the output
$log_str = date('d.m.y').": {$str}rn";
echo $log_str;
// log to file
if (($fp = fopen('upload_log.txt', 'a+')) !== false) {
fputs($fp, $log_str);
fclose($fp);
}
}
/**
*
* delete a directory recursively
* @param string $dir - directory path
* @link http://php.net/manual/en/function.rmdir.php
*/
function rrmdir($dir) {
if (is_dir($dir)) {
$objects = scandir($dir);
foreach ($objects as $object) {
if ($object != "." && $object != "..") {
if (filetype($dir . "/" . $object) == "dir") {
rrmdir($dir . "/" . $object);
} else {
unlink($dir . "/" . $object);
}
}
}
reset($objects);
rmdir($dir);
}
}
/**
*
* check if all the parts exist, and
* gather all the parts of the file together
* @param string $dir - the temporary directory holding all the parts of the file
* @param string $filename - the original file name
* @param string $chunksize - each chunk size (in bytes)
* @param string $totalsize - original file size (in bytes)
*/
function createfilefromchunks($temp_dir, $filename, $chunksize, $totalsize) {
// count all the parts of this file
$total_files = 0;
foreach(scandir($temp_dir) as $file) {
if (stripos($file, $filename) !== false) {
$total_files++;
}
}
// check that all the parts are present
// the size of the last part is between chunksize and 2*$chunksize
if ($total_files * $chunksize >= ($totalsize - $chunksize + 1)) {
// create the final destination file
if (($fp = fopen('temp/'.$filename, 'w')) !== false) {
for ($i=1; $i<=$total_files; $i++) {
fwrite($fp, file_get_contents($temp_dir.'/'.$filename.'.part'.$i));
_log('writing chunk '.$i);
}
fclose($fp);
} else {
_log('cannot create the destination file');
return false;
}
// rename the temporary directory (to avoid access from other
// concurrent chunks uploads) and than delete it
if (rename($temp_dir, $temp_dir.'_unused')) {
rrmdir($temp_dir.'_unused');
} else {
rrmdir($temp_dir);
}
}
}
////////////////////////////////////////////////////////////////////
// the script
////////////////////////////////////////////////////////////////////
//check if request is get and the requested chunk exists or not. this makes testchunks work
if ($_server['request_method'] === 'get') {
$temp_dir = 'temp/'.$_get['resumableidentifier'];
$chunk_file = $temp_dir.'/'.$_get['resumablefilename'].'.part'.$_get['resumablechunknumber'];
if (file_exists($chunk_file)) {
header("http/1.0 200 ok");
} else
{
header("http/1.0 404 not found");
}
}
// loop through files and move the chunks to a temporarily created directory
if (!empty($_files)) foreach ($_files as $file) {
// check the error status
if ($file['error'] != 0) {
_log('error '.$file['error'].' in file '.$_post['resumablefilename']);
continue;
}
// init the destination file (format <filename.ext>.part<#chunk>
// the file is stored in a temporary directory
$temp_dir = 'temp/'.$_post['resumableidentifier'];
$dest_file = $temp_dir.'/'.$_post['resumablefilename'].'.part'.$_post['resumablechunknumber'];
// create the temporary directory
if (!is_dir($temp_dir)) {
mkdir($temp_dir, 0777, true);
}
// move the temporary file
if (!move_uploaded_file($file['tmp_name'], $dest_file)) {
_log('error saving (move_uploaded_file) chunk '.$_post['resumablechunknumber'].' for file '.$_post['resumablefilename']);
} else {
// check if all the parts present, and create the final destination file
createfilefromchunks($temp_dir, $_post['resumablefilename'],
$_post['resumablechunksize'], $_post['resumabletotalsize']);
}
}
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