![header]( "header")
有时候我们为了隐藏真实的下载地址，我们通过采用header定义为文件然后readfile下载，但这样会加大服务器的负担，一般不建议下载量比较大的文件 复制代码 代码如下:function sendFile($fileName, $fancyName = '', $forceDownload = true, $speedLimit = 0, $contentType = '') { if (!is_readable($fileName)) { header("HTTP/1.1 404 Not Found"); return false; } $fileStat = stat($fileName); $lastModified = $fileStat['mtime']; $md5 = md5($fileStat['mtime'] .'='. $fileStat['ino'] .'='. $fileStat['size']); $etag = '"' . $md5 . '-' . crc32($md5) . '"'; header('Last-Modified: ' . gmdate("D, d M Y H:i:s", $lastModified) . ' GMT'); header("ETag: $etag"); if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $lastModified) { header("HTTP/1.1 304 Not Modified"); return true; } if (isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) { header("HTTP/1.1 304 Not Modified"); return true; } if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag) { header("HTTP/1.1 304 Not Modified"); return true; } if ($fancyName == '') { $fancyName = basename($fileName); } if ($contentType == '') { $contentType = 'application/octet-stream'; } $fileSize = $fileStat['size']; $contentLength = $fileSize; $isPartial = false; if (isset($_SERVER['HTTP_RANGE'])) { if (preg_match('/^bytes=(d*)-(d*)$/', $_SERVER['HTTP_RANGE'], $matches)) { $startPos = $matches[1]; $endPos = $matches[2]; if ($startPos == '' && $endPos == '') { return false; } if ($startPos == '') { $startPos = $fileSize - $endPos; $endPos = $fileSize - 1; } else if ($endPos == '') { $endPos = $fileSize - 1; } $startPos = $startPos $endPos = $endPos > $fileSize - 1 ? $fileSize - 1 : $endPos; $length = $endPos - $startPos + 1; if ($length { return false; } $contentLength = $length; $isPartial = true; } } // send headers if ($isPartial) { header('HTTP/1.1 206 Partial Content'); header("Content-Range: bytes $startPos-$endPos/$fileSize"); } else { header("HTTP/1.1 200 OK"); $startPos = 0; $endPos = $contentLength - 1; } header('Pragma: cache'); header('Cache-Control: public, must-revalidate, max-age=0'); header('Accept-Ranges: bytes'); header('Content-type: ' . $contentType); header('Content-Length: ' . $contentLength); if ($forceDownload) { header('Content-Disposition: attachment; filename="' . rawurlencode($fancyName). '"');//汉字自动转为URL编码 header('Content-Disposition: attachment; filename="' . $fancyName. '"'); } header("Content-Transfer-Encoding: binary"); $bufferSize = 2048; if ($speedLimit != 0) { $packetTime = floor($bufferSize * 1000000 / $speedLimit); } $bytesSent = 0; $fp = fopen($fileName, "rb"); fseek($fp, $startPos); //fpassthru($fp); while ($bytesSent { if ($speedLimit != 0) { list($usec, $sec) = explode(" ", microtime()); $outputTimeStart = ((float)$usec + (float)$sec); } $readBufferSize = $contentLength - $bytesSent $buffer = fread($fp, $readBufferSize); echo $buffer; ob_flush(); flush(); $bytesSent += $readBufferSize; if ($speedLimit != 0) { list($usec, $sec) = explode(" ", microtime()); $outputTimeEnd = ((float)$usec + (float)$sec); $useTime = ((float) $outputTimeEnd - (float) $outputTimeStart) * 1000000; $sleepTime = round($packetTime - $useTime); if ($sleepTime > 0) { usleep($sleepTime); } } } return true; } ?>附服务器响应HTTP的类型ContentType大全：".*"="application/octet-stream"".001"="application/x-001"".301"="application/x-301"".323"="text/h323"".906"="application/x-906"".907"="drawing/907"".a11"="application/x-a11"".acp"="audio/x-mei-aac"".ai"="application/postscript"".aif"="audio/aiff"".aifc"="audio/aiff"".aiff"="audio/aiff"".anv"="application/x-anv"".asa"="text/asa"".asf"="video/x-ms-asf"".asp"="text/asp"".asx"="video/x-ms-asf"".au"="audio/basic"".avi"="video/avi"".awf"="application/vnd.adobe.workflow"".biz"="text/xml"".bmp"="application/x-bmp"".bot"="application/x-bot"".c4t"="application/x-c4t"".c90"="application/x-c90"".cal"="application/x-cals"".cat"="application/vnd.ms-pki.seccat"".cdf"="application/x-netcdf"".cdr"="application/x-cdr"".cel"="application/x-cel"".cer"="application/x-x509-ca-cert"".cg4"="application/x-g4"".cgm"="application/x-cgm"".cit"="application/x-cit"".class"="java/*"".cml"="text/xml"".cmp"="application/x-cmp"".cmx"="application/x-cmx"".cot"="application/x-cot"".crl"="application/pkix-crl"".crt"="application/x-x509-ca-cert"".csi"="application/x-csi"".css"="text/css"".cut"="application/x-cut"".dbf"="application/x-dbf"".dbm"="application/x-dbm"".dbx"="application/x-dbx"".dcd"="text/xml"".dcx"="application/x-dcx"".der"="application/x-x509-ca-cert"".dgn"="application/x-dgn"".dib"="application/x-dib"".dll"="application/x-msdownload"".doc"="application/msword"".dot"="application/msword"".drw"="application/x-drw"".dtd"="text/xml"".dwf"="Model/vnd.dwf"".dwf"="application/x-dwf"".dwg"="application/x-dwg"".dxb"="application/x-dxb"".dxf"="application/x-dxf"".edn"="application/vnd.adobe.edn"".emf"="application/x-emf"".eml"="message/rfc822"".ent"="text/xml"".epi"="application/x-epi"".eps"="application/x-ps"".eps"="application/postscript"".etd"="application/x-ebx"".exe"="application/x-msdownload"".fax"="image/fax"".fdf"="application/vnd.fdf"".fif"="application/fractals"".fo"="text/xml"".frm"="application/x-frm"".g4"="application/x-g4"".gbr"="application/x-gbr"".gcd"="application/x-gcd"".gif"="image/gif"".gl2"="application/x-gl2"".gp4"="application/x-gp4"".hgl"="application/x-hgl"".hmr"="application/x-hmr"".hpg"="application/x-hpgl"".hpl"="application/x-hpl"".hqx"="application/mac-binhex40"".hrf"="application/x-hrf"".hta"="application/hta"".htc"="text/x-component"".htm"="text/html"".html"="text/html"".htt"="text/webviewhtml"".htx"="text/html"".icb"="application/x-icb"".ico"="image/x-icon"".ico"="application/x-ico"".iff"="application/x-iff"".ig4"="application/x-g4"".igs"="application/x-igs"".iii"="application/x-iphone"".img"="application/x-img"".ins"="application/x-internet-signup"".isp"="application/x-internet-signup"".IVF"="video/x-ivf"".java"="java/*"".jfif"="image/jpeg"".jpe"="image/jpeg"".jpe"="application/x-jpe"".jpeg"="image/jpeg"".jpg"="image/jpeg"".jpg"="application/x-jpg"".js"="application/x-javascript"".jsp"="text/html"".la1"="audio/x-liquid-file"".lar"="application/x-laplayer-reg"".latex"="application/x-latex"".lavs"="audio/x-liquid-secure"".lbm"="application/x-lbm"".lmsff"="audio/x-la-lms"".ls"="application/x-javascript"".ltr"="application/x-ltr"".m1v"="video/x-mpeg"".m2v"="video/x-mpeg"".m3u"="audio/mpegurl"".m4e"="video/mpeg4"".mac"="application/x-mac"".man"="application/x-troff-man"".math"="text/xml"".mdb"="application/msaccess"".mdb"="application/x-mdb"".mfp"="application/x-shockwave-flash"".mht"="message/rfc822"".mhtml"="message/rfc822"".mi"="application/x-mi"".mid"="audio/mid"".midi"="audio/mid"".mil"="application/x-mil"".mml"="text/xml"".mnd"="audio/x-musicnet-download"".mns"="audio/x-musicnet-stream"".mocha"="application/x-javascript"".movie"="video/x-sgi-movie"".mp1"="audio/mp1"".mp2"="audio/mp2"".mp2v"="video/mpeg"".mp3"="audio/mp3"".mp4"="video/mpeg4"".mpa"="video/x-mpg"".mpd"="application/vnd.ms-project"".mpe"="video/x-mpeg"".mpeg"="video/mpg"".mpg"="video/mpg"".mpga"="audio/rn-mpeg"".mpp"="application/vnd.ms-project"".mps"="video/x-mpeg"".mpt"="application/vnd.ms-project"".mpv"="video/mpg"".mpv2"="video/mpeg"".mpw"="application/vnd.ms-project"".mpx"="application/vnd.ms-project"".mtx"="text/xml"".mxp"="application/x-mmxp"".net"="image/pnetvue"".nrf"="application/x-nrf"".nws"="message/rfc822"".odc"="text/x-ms-odc"".out"="application/x-out"".p10"="application/pkcs10"".p12"="application/x-pkcs12"".p7b"="application/x-pkcs7-certificates"".p7c"="application/pkcs7-mime"".p7m"="application/pkcs7-mime"".p7r"="application/x-pkcs7-certreqresp"".p7s"="application/pkcs7-signature"".pc5"="application/x-pc5"".pci"="application/x-pci"".pcl"="application/x-pcl"".pcx"="application/x-pcx"".pdf"="application/pdf"".pdf"="application/pdf"".pdx"="application/vnd.adobe.pdx"".pfx"="application/x-pkcs12"".pgl"="application/x-pgl"".pic"="application/x-pic"".pko"="application/vnd.ms-pki.pko"".pl"="application/x-perl"".plg"="text/html"".pls"="audio/scpls"".plt"="application/x-plt"".png"="image/png"".png"="application/x-png"".pot"="application/vnd.ms-powerpoint"".ppa"="application/vnd.ms-powerpoint"".ppm"="application/x-ppm"".pps"="application/vnd.ms-powerpoint"".ppt"="application/vnd.ms-powerpoint"".ppt"="application/x-ppt"".pr"="application/x-pr"".prf"="application/pics-rules"".prn"="application/x-prn"".prt"="application/x-prt"".ps"="application/x-ps"".ps"="application/postscript"".ptn"="application/x-ptn"".pwz"="application/vnd.ms-powerpoint"".r3t"="text/vnd.rn-realtext3d"".ra"="audio/vnd.rn-realaudio"".ram"="audio/x-pn-realaudio"".ras"="application/x-ras"".rat"="application/rat-file"".rdf"="text/xml"".rec"="application/vnd.rn-recording"".red"="application/x-red"".rgb"="application/x-rgb"".rjs"="application/vnd.rn-realsystem-rjs"".rjt"="application/vnd.rn-realsystem-rjt"".rlc"="application/x-rlc"".rle"="application/x-rle"".rm"="application/vnd.rn-realmedia"".rmf"="application/vnd.adobe.rmf"".rmi"="audio/mid"".rmj"="application/vnd.rn-realsystem-rmj"".rmm"="audio/x-pn-realaudio"".rmp"="application/vnd.rn-rn_music_package"".rms"="application/vnd.rn-realmedia-secure"".rmvb"="application/vnd.rn-realmedia-vbr"".rmx"="application/vnd.rn-realsystem-rmx"".rnx"="application/vnd.rn-realplayer"".rp"="image/vnd.rn-realpix"".rpm"="audio/x-pn-realaudio-plugin"".rsml"="application/vnd.rn-rsml"".rt"="text/vnd.rn-realtext"".rtf"="application/msword"".rtf"="application/x-rtf"".rv"="video/vnd.rn-realvideo"".sam"="application/x-sam"".sat"="application/x-sat"".sdp"="application/sdp"".sdw"="application/x-sdw"".sit"="application/x-stuffit"".slb"="application/x-slb"".sld"="application/x-sld"".slk"="drawing/x-slk"".smi"="application/smil"".smil"="application/smil"".smk"="application/x-smk"".snd"="audio/basic"".sol"="text/plain"".sor"="text/plain"".spc"="application/x-pkcs7-certificates"".spl"="application/futuresplash"".spp"="text/xml"".ssm"="application/streamingmedia"".sst"="application/vnd.ms-pki.certstore"".stl"="application/vnd.ms-pki.stl"".stm"="text/html"".sty"="application/x-sty"".svg"="text/xml"".swf"="application/x-shockwave-flash"".tdf"="application/x-tdf"".tg4"="application/x-tg4"".tga"="application/x-tga"".tif"="image/tiff"".tif"="application/x-tif"".tiff"="image/tiff"".tld"="text/xml"".top"="drawing/x-top"".torrent"="application/x-bittorrent"".tsd"="text/xml"".txt"="text/plain"".uin"="application/x-icq"".uls"="text/iuls"".vcf"="text/x-vcard"".vda"="application/x-vda"".vdx"="application/vnd.visio"".vml"="text/xml"".vpg"="application/x-vpeg005"".vsd"="application/vnd.visio"".vsd"="application/x-vsd"".vss"="application/vnd.visio"".vst"="application/vnd.visio"".vst"="application/x-vst"".vsw"="application/vnd.visio"".vsx"="application/vnd.visio"".vtx"="application/vnd.visio"".vxml"="text/xml"".wav"="audio/wav"".wax"="audio/x-ms-wax"".wb1"="application/x-wb1"".wb2"="application/x-wb2"".wb3"="application/x-wb3"".wbmp"="image/vnd.wap.wbmp"".wiz"="application/msword"".wk3"="application/x-wk3"".wk4"="application/x-wk4"".wkq"="application/x-wkq"".wks"="application/x-wks"".wm"="video/x-ms-wm"".wma"="audio/x-ms-wma"".wmd"="application/x-ms-wmd"".wmf"="application/x-wmf"".wml"="text/vnd.wap.wml"".wmv"="video/x-ms-wmv"".wmx"="video/x-ms-wmx"".wmz"="application/x-ms-wmz"".wp6"="application/x-wp6"".wpd"="application/x-wpd"".wpg"="application/x-wpg"".wpl"="application/vnd.ms-wpl"".wq1"="application/x-wq1"".wr1"="application/x-wr1"".wri"="application/x-wri"".wrk"="application/x-wrk"".ws"="application/x-ws"".ws2"="application/x-ws"".wsc"="text/scriptlet"".wsdl"="text/xml"".wvx"="video/x-ms-wvx"".xdp"="application/vnd.adobe.xdp"".xdr"="text/xml"".xfd"="application/vnd.adobe.xfd"".xfdf"="application/vnd.adobe.xfdf"".xhtml"="text/html"".xls"="application/vnd.ms-excel"".xls"="application/x-xls"".xlw"="application/x-xlw"".xml"="text/xml"".xpl"="audio/scpls"".xq"="text/xml"".xql"="text/xml"".xquery"="text/xml"".xsd"="text/xml"".xsl"="text/xml"".xslt"="text/xml"".xwd"="application/x-xwd"".x_b"="application/x-x_b"".x_t"="application/x-x_t"参考：， 09-16 08:56