php+resumablejs实现的分块上传 断点续传功能示例

`. 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']); } }