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：
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upload.html
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Select files
upload.PHP
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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}\r\n";
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 .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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