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? ??? ?? PHP ???? ??? ??? ??? ???? PHP ?? ???? ???(???? ??)

??? ??? ??? ???? PHP ?? ???? ???(???? ??)

Jul 25, 2016 am 08:55 AM
  2. /**PHP ???? ???, ??? ?? ???? ??
  3. * ??: 2013-06-30
  4. * ???: fdipzone
  5. * ??: 1.0
  6. * ??: ww.jbxue.com
  7. * Func:
  8. * download: ?? ????
  9. * setSpeed: ???? ?? ??
  10. * getRange: ???? ?? ????
  11. */
  13. class FileDownload{ // ?? ??
  15. ??? $_speed = 512; // ???? ??
  17. /**Download
  18. * @param String $file ????? ?? ??
  19. * @param String $name ???, ?? ??? ????? ???? ??
  20. * @param boolean $reload ??? ?? ?? ??? ??
  21. */
  22. ?? ?? ????($file, $name='', $reload=false){
  23. if(file_exists($file) ){
  24. if($name==''){
  25. $name = basename($file);
  26. }
  28. $fp = fopen($file, 'rb');
  29. $file_size = ?? ??($file);
  30. $ranges = $this->getRange($file_size);
  32. header('cache-control:public');
  33. header('??? ??:?? ????/??-???');
  34. header('content-disposition:attachment; ?? ??='.$name);
  36. if($reload && $ranges!=null){ // ????
  37. header('HTTP/1.1 206 ?? ???');
  38. header('Accept-Ranges:bytes');
  40. // 剩余長(zhǎng)titude
  41. header(sprintf('content-length:%u',$ranges['end']-$ranges['start']));
  43. // ?? ??
  44. header(sprintf('content-range:bytes %s-%s/%s', $ranges['start'], $ranges['end'], $ ??_??));
  46. // fp指針跳到斷點(diǎn)位置
  47. fseek($fp, sprintf('%u', $ranges['start']));
  48. }else{
  49. header('HTTP/1.1 200 OK');
  50. header('content-length:'.$file_size);
  51. }
  53. while(!feof($fp)){
  54. echo fread($fp, round($this->_speed*1024,0));
  55. ob_flush();
  56. //??(1); // 于測(cè)試,減慢下載速degree
  57. }
  59. ($fp!=null) && fclose($fp);
  61. }else{
  62. return '';
  63. }
  64. }
  66. /**???? ?? ??
  67. * @param int $speed
  68. */
  69. ?? ?? setSpeed($speed){
  70. if(is_numeric($speed) && $speed>16 && $ ??<4096){
  71. $this->_speed = $speed;
  72. }
  73. }
  75. /**?? ?? ?? ????
  76. * @param int $file_size ?? ??
  77. * @return Array
  78. */
  79. ??? ?? getRange($file_size){
  80. if(isset($_SERVER['HTTP_RANGE']) && ! ????($_SERVER['HTTP_RANGE'])){
  81. $range = $_SERVER['HTTP_RANGE'];
  82. $range = preg_replace('/[s|,].*/', '', $range);
  83. $range =explod('-', substr($range, 6));
  84. if(count($range)<2){
  85. $range[1] = $file_size;
  86. }
  87. $range = array_combine(array('start','end'), $range);
  88. if(empty($range['start'])){
  89. $range['start'] = 0;
  90. }
  91. if(empty($range['end'])){
  92. $range['end'] = $file_size;
  93. }
  94. return $range;
  95. }
  96. null? ?????.
  97. }
  99. } // ?? ??
  101. ?>
復(fù)代碼

2,演示示例 ??. PHP

  2. require('FileDownload.class.php');
  3. $file = 'book.zip';
  4. $name = ??().'.zip';
  5. $obj = new FileDownload();
  6. $flag = $obj->download($file, $name);
  7. //$flag = $obj->download($file, $name, true); // 斷點(diǎn)續(xù)傳
  9. if(!$flag){
  10. echo '??? ????';
  11. }
  13. ?>
復(fù)代代碼

斷點(diǎn)續(xù)傳測(cè)試??: 使用linux wget命令去測(cè)試下載, wget -c -O ?? http://xxx

1,先關(guān)閉斷點(diǎn)續(xù)傳

  2. $flag = $obj->download($file, $name);
復(fù)主代碼

wget ??? ???? ??? ??? ??????.

  2. root@jbxue:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php
  3. -- 2013-06-30 16:52:44-- http://demo.fdipzone.com/demo.php
  4. ??? ??.fdipzone.com ?? ?... 127.0.0.1
  5. demo.fdipzone? ?? ? . com|127.0.0.1|:80... ???????.
  6. HTTP ??? ?????? ??? ???? ?... 200 OK
  7. ??: 10445120(10.0M) [application/octet-stream]
  8. ?? ??: “test.rar”
  9. 30% [= ===========================> ] 3,146,580 513K/s ?? ?? 14?
  10. ^C
  11. root@jbxue :~/ ????$ wget -c -O test.rar http://demo.fdipzone.com/demo.php
  12. --2013-06-30 16:52:57-- http://demo.fdipzone .com/ ??.php
  13. ??? ??.fdipzone.com ?? ?... 127.0.0.1
  14. demo.fdipzone.com|127.0.0.1|:80 ?? ?... ???????.
  15. HTTP ??? ?????? ??? ???? ?... 200 OK
  16. ??: 10445120(10.0M) [application/octet-stream]
  17. ?? ??: “test.rar”
  18. 30% [= ==========================> ] 3,146,580 515K/s ?? ?? 14?
  19. ^C
?? ??

wget -c? ????? ???? ??? ? ??? ? ? ????.

2. ??? ??? ??????.

  2. $flag = $obj->download($file, $name, true);
?? ??

wget ??? ???? ?? ??? ??????.

  2. root@jbxue:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php
  3. -- 2013-06-30 16:53:19-- http://demo.fdipzone.com/demo.php
  4. ??? ??.fdipzone.com ?? ?... 127.0.0.1
  5. demo.fdipzone? ?? ? . com|127.0.0.1|:80... ???????.
  6. HTTP ??? ?????? ??? ???? ?... 200 OK
  7. ??: 10445120(10.0M) [application/octet-stream]
  8. ?? ??: “test.rar”
  10. 20 % [==================> ] 2,097,720 516K/s ?? ?? 16?
  11. ^C
  12. root@jbxue:~/Downloads$ wget - c -O test.rar http://demo.fdipzone.com/demo.php
  13. --2013-06-30 16:53:31-- http://demo.fdipzone.com/demo.php
  14. ?? ? ??? ??.fdipzone.com... 127.0.0.1
  15. ?? ? ??.fdipzone.com|127.0.0.1|:80... ???????.
  16. HTTP ?? ???, ?? ?? ?... 206 ?? ???
  17. ??: 10445121(10.0M), 7822971(7.5M) ?? ??? [application/octet-stream]
  18. ?? ??: "test. rar"
  20. 100%[ ===============================>] 10,445,121 543K /s 14? ??
  22. 2013-06-30 16:53:45 (543 KB/s) - "test.rar" ??? [10445121/10445121])
?? ??

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