PHP support for breakpoint continuation, block download class

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<?php/** * User:djunny * date:2016-04-29 * time:17:18 * mail:199962760@qq.com * Support for breakpoint download class */class Downloader {/* * * Download file to local path * * @param $url * @param $save _file * @param int $speed * @param array $headers * @param int $timeout * @return BOOL * @throws Exception */static function Get ($url, $save _file, $spee    D = 10240, $headers = Array (), $timeout = ten) {$url _info = self::p arse_url ($url);    if (! $url _info[' host ') {throw new Exception (' URL is Invalid '); }//default header $def _headers = Array (' Accept ' = ' */* ', ' user-agent ' = ' mozilla/4.0 (CO mpatible; 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 was 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::d ownload_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) {$url _info = PA    Rse_url ($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 < $total _size + $read _length) {fclose ($fsocket);        Fclose ($file _fp);      throw new Exception (' Socket I/O Error Or File was Changed ');      } $total _size + = $read _length;      Fputs ($file _fp, $RESP); Check file End if ($content _length = =$total _size) {break;      } sleep (1);    for Test//break;    } fclose ($fsocket);    Fclose ($file _fp);   return true; }/** * Get content length * * @param $host * @param $port * @param $url _path * @param $headers * @param $ Timeout * @return int */static function get_content_size ($host, $port, $url _path, & $headers, $timeout) {$req    Uest = Self::build_header (' HEAD ', $url _path, $headers);    $fsocket = @fsockopen ($host, $port, $errno, $errstr, $timeout);    Stream_set_blocking ($fsocket, TRUE);    Stream_set_timeout ($fsocket, $timeout);    Fwrite ($fsocket, $request);    $status = Stream_get_meta_data ($fsocket);    $length = 0;    if ($status [' timed_out ']) {return 0;      } while (!feof ($fsocket)) {$line = @fgets ($fsocket);      if (In_array ($line, Array ("\ n", "\ r \ n"))) {break;      } $line = Strtolower ($line); Get location if (substr ($line, 0, 9) = = ' Location: ') {$location = Trim (substr($line, 9));        $url _info = self::p arse_url ($location);        if (! $url _info[' host ') {return 0;        } fclose ($fsocket);      Return self::get_content_size ($url _info[' host '), $url _info[' Port ', $url _info[' request '], $headers, $timeout); }//Get content length if (Strpos ($line, ' content-length: ')!== false) {list (, $length) = Explode (' cont        Ent-length: ', $line);      $length = (int) trim ($length);    }} fclose ($fsocket);   return $length; }/** * Build header for Socket * * @param $action * @param $url _path * @param $headers * @param int $    Range_start * @return String */static function Build_header ($action, $url _path, & $headers, $range _start =-1) { $out = $action.    "{$url _path} http/1.0\r\n"; foreach ($headers as $hkey = = $hval) {$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 ';} */?>

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