本文是为大家分享php支持断点续传、分块下载的类，供大家参考，具体内容如下
'*/*', 'user-agent' => 'mozilla/4.0 (compatible; msie 8.0; windows nt 5.1; trident/4.0)', 'accept-encoding' => 'gzip, deflate', 'host' => $url_info['host'], 'connection' => 'close', 'accept-language' => 'zh-cn', ); // merge heade $headers = array_merge($def_headers, $headers); // get content length $content_length = self::get_content_size($url_info['host'], $url_info['port'], $url_info['request'], $headers, $timeout); // content length not exist if (!$content_length) { throw new exception('content-length is not exists'); } // get exists length $exists_length = is_file($save_file) ? filesize($save_file) : 0; // get tmp data file $data_file = $save_file . '.data'; // get tmp data $exists_data = is_file($data_file) ? json_decode(file_get_contents($data_file), 1) : array(); // check file is valid if ($exists_length == $content_length) { $exists_data && @unlink($data_file); return true; } // check file is expire if ($exists_data['length'] != $content_length || $exists_length > $content_length) { $exists_data = array( 'length' => $content_length, ); } // write exists data file_put_contents($data_file, json_encode($exists_data)); try { $download_status = self::download_content($url_info['host'], $url_info['port'], $url_info['request'], $save_file, $content_length, $exists_length, $speed, $headers, $timeout); if ($download_status) { @unlink($data_file); } } catch (exception $e) { throw new exception($e->getmessage()); } return true; } /** * parse url * * @param $url * @return bool|mixed */ static function parse_url($url) { $url_info = parse_url($url); if (!$url_info['host']) { return false; } $url_info['port'] = $url_info['port'] ? $url_info['host'] : 80; $url_info['request'] = $url_info['path'] . ($url_info['query'] ? '?' . $url_info['query'] : ''); return $url_info; } /** * download content by chunk * * @param $host * @param $port * @param $url_path * @param $headers * @param $timeout */ static function download_content($host, $port, $url_path, $save_file, $content_length, $range_start, $speed, &$headers, $timeout) { $request = self::build_header('get', $url_path, $headers, $range_start); $fsocket = @fsockopen($host, $port, $errno, $errstr, $timeout); stream_set_blocking($fsocket, true); stream_set_timeout($fsocket, $timeout); fwrite($fsocket, $request); $status = stream_get_meta_data($fsocket); if ($status['timed_out']) { throw new exception('socket connect timeout'); } $is_header_end = 0; $total_size = $range_start; $file_fp = fopen($save_file, 'a+'); while (!feof($fsocket)) { if (!$is_header_end) { $line = @fgets($fsocket); if (in_array($line, array(\n, \r\n))) { $is_header_end = 1; } continue; } $resp = fread($fsocket, $speed); $read_length = strlen($resp); if ($resp === false || $content_length $hval) { $out .= $hkey . ': ' . $hval . \r\n; } if ($range_start > -1) { $out .= accept-ranges: bytes\r\n; $out .= range: bytes={$range_start}-\r\n; } $out .= \r\n; return $out; }} #use age/*try { if (downloader::get('http://dzs.aqtxt.com/files/11/23636/201604230358308081.rar', 'test.rar')) { //todo echo 'download succ'; }} catch (exception $e) { echo 'download failed';}*/?>
以上就是本文的全部内容，希望对大家的学习有所帮助。
以上就介绍了php支持断点续传、分块下载的类，包括了方面的内容，希望对php教程有兴趣的朋友有所帮助。