文件有时下载为 .PHP 而不是 .PDF?

2022-01-02 00:00:00 download php

我正在编写一个脚本，允许用户下载在线存储的文件.它似乎总是适用于图像文件，但对于 PDF，浏览器有时会下载 .PHP 文件而不是 .PDF 文件.

I'm working on a script that allows users to download files stored online. It always seems to work with image files, but with PDF's the browser sometimes downloads .PHP files instead of .PDF's.

我没有用任何其他文件类型测试过该脚本，所以我不知道问题是否仅限于 PDF 或者其他类型也会发生.

I haven't tested the script with any other file types, so I don't know if the problem is limited to PDF's or if it would happen for other types as well.

这是我的代码:

$mimeTypes = array(
    /* images */
    'png' => 'image/png', 'jpeg' => 'image/jpeg', 'jpg' => 'image/jpeg', 'gif' => 'image/gif', 'bmp' => 'image/bmp',
    /* spreadsheets */
    'xl' => 'application/vnd.ms-excel', 'xls' => 'application/vnd.ms-excel', 'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'csv' => 'text/csv', 'sdc' => 'application/vnd.stardivision.calc', 'odc' => 'application/vnd.oasis.opendocument.chart',
    /* text files */
    'doc' => 'application/msword', 'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'odt' => 'application/vnd.oasis.opendocument.text', 'rtf' => 'application/rtf', 'rtx' => 'text/richtext',
    /* PDF */
    'pdf' => 'application/pdf'
);

$file = __DIR__ . '/files/' . $row['disk_name'];

header('Content-Description: File Transfer');
header('Content-Type: ' . $mimeTypes[$row['ext']]);
header('Content-Disposition: attachment; filename="'. $row['name'] .'"');
header('Content-Transfer-Encoding: binary');
header('Connection: Keep-Alive');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
readfile($file);
die();

下载的 .PHP 文件比相应的 PDF 文件大 1KB.在记事本中，下载为 .PHP 的 PDF 文件中的额外内容如下所示:

The .PHP files that are downloaded are 1KB larger than the corresponding PDF files. In notepad, the extra content in a PDF file downloaded as .PHP looks like this:

Û¼T"gS_åœx¨fꙸx0]Ï~0î…[#X7beú
Œ¾){(‹Ã ‰ždêò¤ž
^`ô}ȯDdìè¬#¸A,.Û­àÇ3ðuúÑÅIôo GP‘pð.bWædÎVª8¨‹ÃÚï~"½1ÚùYGrƒ^º9YçãžÁa0]žÿ{VP§•ÑúÄ›²/Óa4§ R   Â×ïYGrøå3¨$Ë  Køpf%„   HÐá@~Tyw«ðŠfPý—@òwæà– Ác8rI:2ëÅ*P5„*‚øïÖ`»´æí£³Èx€–T$W³d´ HÏy»…G˜ÊÃ?Ž=TÐð+PÊÃc6’q
¥üQ˜Q¦GØšOQò‹¹t‡€öGz‚‘«mØÌ&Æ5kPnd Ôs˜ù7Ê¢ø=à¦Uïºd"Âœ¸ÐîÌóÏlnŒVšÊ¤P[¾ò¸ª‹„mÊO/
‹xï$   Ƶ¤%0´7M?ÒÙdaã1ÓKùaPÌZó†A¬møY¨¿D›K²Ji;w €9ö>*®h³³†‚wRy¶=s+Uñd¤™ýØ·ÇΗú®Q–kÈ(˜´jñWQd©¢à¦MÌw½Ÿt°Z±Þa¾co{Ö`ȳŸô¯òje©ÒPióBL$"ÓP/&´ÆÞµš9h–)lŸk  )
À„uÚº'Ûˆ"Ô_4~‹}]?óâùg3 Ô¨?ËL¡ê*¢‰"çS)  M³‘*LâGG…®sœùw;¤N`Åx½cëu  'oJæeÆ_M½ËÒXÈ…³„{ÈŃ)õ³P´œ»SI™P,éH@¸’ÄÌ^ÓÙb§[id˜_^çî>zflø€aÞ‹€% G‘,=ùI¦ÕaˆVEÃvoûl•>`ÂÆJ^V›ƒ
:"ˆi„ÄÐ’@€Ð—ìRy¯ '¡šË¢›Øƒ
Æ[&ÉF›­’_+Õ¢$ÜÜMãºÏ€u},w†¼BœÄA`R¤dYm)Œ$¤<},<³Ó_¥æËÒP|&Tj; •ê¥U0h|&Õ}©¸t‹s *1žõŽ2„E'…ÛnäYjë— Tg¡’v•[  ¥ì¤îK¨ä–t$ üñ؉¸X€R+e^ªx;£ÌË&ä´R®ðúpR_Åíf ^,vžÒJcAŽ•<O€LR1%ªP¡Ãê–x]º¬#Îs?¨üVŽ*jæ ¤Úbª£ê£«â7îm]û$ ÇUfGÄo£ÒÛþO#ƒÞ©?t±ª·PN¹¡8¨i°<ôyZ_lGÞJÕY{®Hõ X~
¸Å‘"H; «™
a™Žl%BÅׄ]Œ‹ešµR…JÏeÕÒ(gH©,ÓÚaIR/¤¬Ÿ#? J  ¸’„"ã.žÚ#§j¥Š³çŠtâÅ°^)¹Ï(Pm°¢¨–ÕÒ‹ˆk)ÂÚý£Ò5 $W¬WPa&/çG1ÈDaÕû²Žâ:¥§š™"2HŸˆUë«WŒRF°"²yݳYEÂÁoØŠ?@‘dŠ-HVÑîÝ?jÆr)¨º7¥Bd–•u$¼&Eê®eùµRÂf,UË Û«‚•jõYšU²±Ú!ò#¼–aÐÍU°ÚsVTö
­ìÄ^úª•
Tصr‡gPùÅ™0©S"ûË‘.œÅå•   ³‘„ôjÞ6ËÂOçÌAj?j÷,¬ÎpRŸx}Äd$ÌpÓxÇnÚŽ3yä/rž©öU™ö¢‘ú²ÇGÁ£È¡/L<賎Drþy·³Ú¨•*nîªS±µN+¶IÓª5ô®üÕ¶fâ•×|+ë­vØ×J·¶>ž²ÞÅ&4k>HTTP/1.1 200 OK
Date: Fri, 26 Jul 2013 03:24:16 GMT
Server: Apache/2.4.2 (Win64) PHP/5.4.3
X-Powered-By: PHP/5.4.3
Expires: 0
Cache-Control: must-revalidate, post-check=0, pre-check=0
Pragma: public
Content-Description: File Transfer
Content-Disposition: attachment; filename="bst-bmp180-ds000-08.pdf"
Content-Transfer-Encoding: binary
Connection: Keep-Alive, Keep-Alive
Content-Length: 752201
Keep-Alive: timeout=5, max=99
Content-Type: application/pdf

我做错了什么导致了这种情况的发生?

What am I doing wrong that is causing this to happen?

推荐答案

在 readfile() 之前添加 ob_clean(); and flush(); 函数; 函数，根据 PHP 手册中关于该主题的说明，可能值得使用.

Adding ob_clean(); and flush(); functions before the readfile(); function, could be something worth using, as per what the PHP manual states on the subject.

读取文件()http://php.net/manual/en/function.readfile.php

ob_clean() http://php.net/manual/en/function.ob-clean.php

ob_clean() http://php.net/manual/en/function.ob-clean.php

冲洗()http://php.net/manual/en/function.ob-flush.php

您发布的代码中没有这些函数.

These functions are not present in your posted code.

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