PHP header 发送HTTP报头函数功能详解,PHP header 发送HTTP头函数功能详解,PHP header 发送HTTP报头函数功能,PHP header 发送HTTP报头函数详解,PHP header 发送HTTP头函数功能,PHP header 发送HTTP头函数详解,PHP header 发送HTTP报头函数,PHP header 发送HTTP报头,PHP header 函数功能详解,PHP header 发送HTTP,PHP header 函数功能,PHP header 函数详解,PHP header 函数,PHP header 功能,PHP header 详解,PHP header HTTP,PHP headerheader() 函数,发送 HTTP 报头,header (string, replace, http_response_code),string 必需。规定要发送的报头字符串,replace 可选。指示该报头是否替换之前的报头,http_response_code 可选。把 HTTP 响应代码强制为指定的值,Content-Type: xxxx/yyyy,ocation: xxxx:yyyy/zzzz,Status: nnn xxxxxx,header('Location: http://www.baidu.com/');,output_buffer,header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");,header("Cache-Control: no-cache");,header("Pragma: no-cache");,header("Status:404 NotFound");,header("Content-type:application/pdf"); //文件将被称为 downloaded.pdf,header("Content-Disposition:attachment;filename='downloaded.pdf'"); //PDF 源在 original.pdf 中,readfile("original.pdf");,header('Content-type: application/image/pjpeg'); //输出的类型,header('Content-Disposition: attachment; filename="downloaded.jpg"');//下载显示的名字,注意格式,readfile('my.jpg');。

PHP header 发送HTTP报头函数功能详解:

函数功能:
    送出HTTP协议的头信息到用户浏览器。
    header() 函数向客户端发送原始的 HTTP 报头。

函数语法:
    header (string, replace, http_response_code)

函数返回值:整数

函数种类:网络系统

参数及说明:
    参数                 描述
    string               必需。规定要发送的报头字符串。
    replace              可选。指示该报头是否替换之前的报头,或添加第二个报头。默认是 true(替换)。false(允许相同类型的多个报头)。
    http_response_code   可选。把 HTTP 响应代码强制为指定的值。(PHP 4 以及更高版本可用)

函数内容说明:
    标头(header)是服务器以 HTTP 协议传 HTML 资料到浏览器前所送出的字符串,在标头与 HTML 文件之间尚需空一行分隔。
    在 PHP 中送回 HTML 资料前,需先传完所有的标头。

注意事项:
    传统的标头一定包含下面三种标头之一,并只能出现一次。
    Content-Type: xxxx/yyyy
    ocation: xxxx:yyyy/zzzz
    Status: nnn xxxxxx
    在新的多型标头规格 (Multipart MIME) 方可以出现二次以上。
    从 PHP 4.4 之后,该函数防止一次发送多个报头。这是对头部注入攻击的保护措施。
    认识到一点很重要,即必须在任何实际的输出被发送之前调用 header() 函数(在 PHP 4 以及更高的版本中,您可以使用输出缓存来解决此问题)。

重点注意:
    要提醒大家注意一点,所有头信息都必须在体内容之前,如果一旦有 任何输出了的话,header函数写的 头信息就没用了。
    比如,在文件最开头的<?php处,如果前面有空格或者有空行,那header函数就没用了。
    例如:
        <html>
        <?php
            //结果出错
            //“<html>”字符在调用 header() 之前已存在输出
            header('Location: http://www.example.com/');
        ?>
    (其实可以通过设置:output_buffer 来解决,anyway),为什么这样,可以看看HTTP协议,很简单。

使用范例:
    1、跳转:
        header('Location: http://www.example.com/');

    2、指定内容:
        header('Content-type: application/pdf');

    3、附件:
        //指定内容为附件
        header('Content-Disposition: attachment; filename="downloaded.pdf"');
        //打开文件,并输出
        readfile('original.pdf');

    范例一:本例用来重定向用户页面到PHP的官方网站。
        <?php
        Header("Location:http://www.php.net");
        exit;
        ?>

    范例二:欲让用户每次都能得到最新的资料,而不是Proxy或cache中的资料,可以使用下列的标头。
        <?php
        //Date in the past
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
        header("Cache-Control: no-cache");
        header("Pragma: no-cache");
        ?>

    范例三:让用户的浏览器出现找不到文件的信息(404 错误)。
        <?php
        header("Status:404 NotFound");
        ?>

    范例四:提供让用户下载文件的范例。提示用户保存一个生成的 PDF 文件(Content-Disposition 报头用于提供一个推荐的文件名,并强制浏览器显示保存对话框):
        <?php
        header("Content-type:application/pdf"); //文件将被称为 downloaded.pdf
        header("Content-Disposition:attachment;filename='downloaded.pdf'"); //PDF 源在 original.pdf 中
        readfile("original.pdf");
        ?>

附加知识:
    <?php
    header('Content-type: application/image/pjpeg');                         //输出的类型
    header('Content-Disposition: attachment; filename="downloaded.jpg"');    //下载显示的名字,注意格式。
    readfile('my.jpg');
    //并将这个文件以前面header发送信息设定的类型输出,从而会弹出一个下载框。
    //就是把服务器上的my.jpg下载下来,下载显示和保存的名字默认是downloaded.jpg。
    ?>

    文档类型 和 服务器响应HTTP的类型:
    上面的这个可以在上传文件的类型中对应上,下面的差了点。(原文下面的是用来写在文件头上的,来确定该文件是什么类型。)

    'chm'=>'application/octet-stream',
    'ppt'=>'application/vnd.ms-powerpoint',
    'xls'=>'application/vnd.ms-excel',
    'doc'=>'application/msword',
    'exe'=>'application/octet-stream',
    'rar'=>'application/octet-stream',
    'js'=>"javascript/js",
    'css'=>"text/css",
    'hqx'=>"application/mac-binhex40",
    'bin'=>"application/octet-stream",
    'oda'=>"application/oda",
    'pdf'=>"application/pdf",
    'ai'=>"application/postsrcipt",
    'eps'=>"application/postsrcipt",
    'es'=>"application/postsrcipt",
    'rtf'=>"application/rtf",
    'mif'=>"application/x-mif",
    'csh'=>"application/x-csh",
    'dvi'=>"application/x-dvi",
    'hdf'=>"application/x-hdf",
    'nc'=>"application/x-netcdf",
    'cdf'=>"application/x-netcdf",
    'latex'=>"application/x-latex",
    'ts'=>"application/x-troll-ts",
    'src'=>"application/x-wais-source",
    'zip'=>"application/zip",
    'bcpio'=>"application/x-bcpio",
    'cpio'=>"application/x-cpio",
    'gtar'=>"application/x-gtar",
    'shar'=>"application/x-shar",
    'sv4cpio'=>"application/x-sv4cpio",
    'sv4crc'=>"application/x-sv4crc",
    'tar'=>"application/x-tar",
    'ustar'=>"application/x-ustar",
    'man'=>"application/x-troff-man",
    'sh'=>"application/x-sh",
    'tcl'=>"application/x-tcl",
    'tex'=>"application/x-tex",
    'texi'=>"application/x-texinfo",
    'texinfo'=>"application/x-texinfo",
    't'=>"application/x-troff",
    'tr'=>"application/x-troff",
    'roff'=>"application/x-troff",
    'shar'=>"application/x-shar",
    'me'=>"application/x-troll-me",
    'ts'=>"application/x-troll-ts",
    'gif'=>"image/gif",
    'jpeg'=>"image/pjpeg",
    'jpg'=>"image/pjpeg",
    'jpe'=>"image/pjpeg",
    'ras'=>"image/x-cmu-raster",
    'pbm'=>"image/x-portable-bitmap",
    'ppm'=>"image/x-portable-pixmap",
    'xbm'=>"image/x-xbitmap",
    'xwd'=>"image/x-xwindowdump",
    'ief'=>"image/ief",
    'tif'=>"image/tiff",
    'tiff'=>"image/tiff",
    'pnm'=>"image/x-portable-anymap",
    'pgm'=>"image/x-portable-graymap",
    'rgb'=>"image/x-rgb",
    'xpm'=>"image/x-xpixmap",
    'txt'=>"text/plain",
    'c'=>"text/plain",
    'cc'=>"text/plain",
    'h'=>"text/plain",
    'html'=>"text/html",
    'htm'=>"text/html",
    'htl'=>"text/html",
    'rtx'=>"text/richtext",
    'etx'=>"text/x-setext",
    'tsv'=>"text/tab-separated-values",
    'mpeg'=>"video/mpeg",
    'mpg'=>"video/mpeg",
    'mpe'=>"video/mpeg",
    'avi'=>"video/x-msvideo",
    'qt'=>"video/quicktime",
    'mov'=>"video/quicktime",
    'moov'=>"video/quicktime",
    'movie'=>"video/x-sgi-movie",
    'au'=>"audio/basic",
    'snd'=>"audio/basic",
    'wav'=>"audio/x-wav",
    'aif'=>"audio/x-aiff",
    'aiff'=>"audio/x-aiff",
    'aifc'=>"audio/x-aiff",
    'swf'=>"application/x-shockwave-flash"
    'myz'=>"application/myz"
   
    ".*"="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"
    ".myz"="application/myz"