Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML
><HEAD
><TITLE
>header</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
REL="HOME"
TITLE="Manual PHP"
HREF="index.html"><LINK
REL="UP"
TITLE="HTTP Functions"
HREF="ref.http.html"><LINK
REL="PREVIOUS"
TITLE="HTTP Functions"
HREF="ref.http.html"><LINK
REL="NEXT"
TITLE="headers_list"
HREF="function.headers-list.html"><META
HTTP-EQUIV="Content-type"
CONTENT="text/html; charset=ISO-8859-2"></HEAD
><BODY
CLASS="refentry"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>Manual PHP</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="ref.http.html"
ACCESSKEY="P"
>Înapoi</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.headers-list.html"
ACCESSKEY="N"
>Înainte</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.header"
></A
>header</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN33852"
></A
><P
>    (PHP 3, PHP 4 , PHP 5)</P
>header&nbsp;--&nbsp;Send a raw HTTP header</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN33855"
></A
><H2
>Description</H2
>void <B
CLASS="methodname"
>header</B
> ( string string [, bool replace [, int http_response_code]])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>header()</B
> is used to send raw
     <ACRONYM
CLASS="acronym"
>HTTP</ACRONYM
> headers.  See the <A
HREF="http://www.faqs.org/rfcs/rfc2616"
TARGET="_top"
>HTTP/1.1 specification</A
> for more
     information on <ACRONYM
CLASS="acronym"
>HTTP</ACRONYM
> headers.
    </P
><P
>&#13;     The optional <VAR
CLASS="parameter"
>replace</VAR
> parameter indicates
     whether the header should replace a previous similar header, or
     add a second header of the same type.  By default it will replace,
     but if you pass in <TT
CLASS="constant"
><B
>FALSE</B
></TT
> as the second argument you can force
     multiple headers of the same type.  For example:
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33878"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />header</font><font color="#007700">(</font><font color="#DD0000">'WWW-Authenticate: Negotiate'</font><font color="#007700">);<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">'WWW-Authenticate: NTLM'</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><P
>&#13;     The second optional <VAR
CLASS="parameter"
>http_response_code</VAR
> force the
     HTTP response code to the specified value. (This parameter is available
     in PHP 4.3.0 and higher.)
    </P
><P
>&#13;     There are two special-case header calls.  The first is a header 
     that starts with the string "<VAR
CLASS="literal"
>HTTP/</VAR
>" (case is not
     significant), which will be used to figure out the HTTP status
     code to send. For example, if you have configured Apache to
     use a PHP script to handle requests for missing files (using
     the <VAR
CLASS="literal"
>ErrorDocument</VAR
> directive), you may want to
     make sure that your script generates the proper status code.
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33886"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />header</font><font color="#007700">(</font><font color="#DD0000">"HTTP/1.0 404 Not Found"</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
   </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      The HTTP status header line will always be the first sent
      to the client, regardless of the actual <B
CLASS="function"
>header()</B
> 
      call being the first or not. The status may be overridden 
      by calling <B
CLASS="function"
>header()</B
> with a new status line
      at any time unless the HTTP headers have already been sent.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      In PHP 3, this only works when PHP is compiled as an Apache
      module. You can achieve the same effect using the
      <VAR
CLASS="literal"
>Status</VAR
> header.
      <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33895"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />header</font><font color="#007700">(</font><font color="#DD0000">"Status: 404 Not Found"</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     The second special case is the "Location:" header.  Not only does 
     it send this header back to the browser, but it also returns a 
     <VAR
CLASS="literal"
>REDIRECT</VAR
> (302) status code to the browser unless 
     some <VAR
CLASS="literal"
>3xx</VAR
> status code has already been set.
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33901"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />header</font><font color="#007700">(</font><font color="#DD0000">"Location: http://www.example.com/"</font><font color="#007700">); </font><font color="#FF8000">/* Redirect browser */<br /><br />/* Make sure that code below does not get executed when we redirect. */<br /></font><font color="#007700">exit;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      HTTP/1.1 requires an absolute <ACRONYM
CLASS="acronym"
>URI</ACRONYM
> as argument to
      <A
HREF="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30"
TARGET="_top"
>Location:</A
>
      including the scheme, hostname and absolute path, but
      some clients accept relative URIs. You can usually use
      <VAR
CLASS="literal"
>$_SERVER['HTTP_HOST']</VAR
>, <VAR
CLASS="literal"
>$_SERVER['PHP_SELF']</VAR
>
      and <A
HREF="function.dirname.html"
><B
CLASS="function"
>dirname()</B
></A
> to make an absolute URI from a
      relative one yourself:
      <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33910"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />header</font><font color="#007700">(</font><font color="#DD0000">"Location: http://" </font><font color="#007700">. </font><font color="#0000BB">$_SERVER</font><font color="#007700">[</font><font color="#DD0000">'HTTP_HOST'</font><font color="#007700">]<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;. </font><font color="#0000BB">dirname</font><font color="#007700">(</font><font color="#0000BB">$_SERVER</font><font color="#007700">[</font><font color="#DD0000">'PHP_SELF'</font><font color="#007700">])<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;. </font><font color="#DD0000">"/" </font><font color="#007700">. </font><font color="#0000BB">$relative_url</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     PHP scripts often generate dynamic content that must not be cached
     by the client browser or any proxy caches between the server and the
     client browser. Many proxies and clients can be forced to disable
     caching with:
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33914"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// Date in the past<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Expires: Mon, 26 Jul 1997 05:00:00 GMT"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// always modified<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Last-Modified: " </font><font color="#007700">. </font><font color="#0000BB">gmdate</font><font color="#007700">(</font><font color="#DD0000">"D, d M Y H:i:s"</font><font color="#007700">) . </font><font color="#DD0000">" GMT"</font><font color="#007700">);<br /> <br /></font><font color="#FF8000">// HTTP/1.1<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Cache-Control: no-store, no-cache, must-revalidate"</font><font color="#007700">);<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Cache-Control: post-check=0, pre-check=0"</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// HTTP/1.0<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">"Pragma: no-cache"</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      You may find that your pages aren't cached even if you don't
      output all of the headers above. There are a number of options
      that users may be able to set for their browser that change its
      default caching behavior. By sending the headers above, you should
      override any settings that may otherwise cause the output of your
      script to be cached.
     </P
><P
>&#13;      Additionally, <A
HREF="function.session-cache-limiter.html"
><B
CLASS="function"
>session_cache_limiter()</B
></A
> and
      the <VAR
CLASS="literal"
>session.cache_limiter</VAR
> configuration
      setting can be used to automatically generate the correct
      caching-related headers when sessions are being used.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     Remember that <B
CLASS="function"
>header()</B
> must be
     called before any actual output is sent, either by normal HTML
     tags, blank lines in a file, or from PHP. It is a very common
     error to read code with <A
HREF="function.include.html"
><B
CLASS="function"
>include()</B
></A
>, or
     <A
HREF="function.require.html"
><B
CLASS="function"
>require()</B
></A
>, functions, or another file access
     function, and have spaces or empty lines that are output before
     <B
CLASS="function"
>header()</B
> is called. The same problem exists
     when using a single PHP/HTML file.
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33927"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
&lt;html&gt;<br /><font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">/* This will give an error. Note the output<br /> * above, which is before the header() call */<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">'Location: http://www.example.com/'</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      In PHP 4, you can use output buffering to get around this problem,
      with the overhead of all of your output to the browser being buffered
      in the server until you send it. You can do this by calling
      <A
HREF="function.ob-start.html"
><B
CLASS="function"
>ob_start()</B
></A
> and <A
HREF="function.ob-end-flush.html"
><B
CLASS="function"
>ob_end_flush()</B
></A
>
      in your script, or setting the <VAR
CLASS="literal"
>output_buffering</VAR
>
      configuration directive on in your <TT
CLASS="filename"
>php.ini</TT
> or
      server configuration files.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     If you want the user to be prompted to save the data you are
     sending, such as a generated PDF file, you can use the <A
HREF="http://www.faqs.org/rfcs/rfc2183"
TARGET="_top"
>Content-Disposition</A
> header to
     supply a recommended filename and force the browser to display the
     save dialog.
    </P
><P
>&#13;     <DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN33938"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// We'll be outputting a PDF<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">'Content-type: application/pdf'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// It will be called downloaded.pdf<br /></font><font color="#0000BB">header</font><font color="#007700">(</font><font color="#DD0000">'Content-Disposition: attachment; filename="downloaded.pdf"'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// The PDF source is in original.pdf<br /></font><font color="#0000BB">readfile</font><font color="#007700">(</font><font color="#DD0000">'original.pdf'</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
></P
></DIV
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      There is a bug in Microsoft Internet Explorer 4.01 that prevents
      this from working. There is no workaround. There is also a bug
      in Microsoft Internet Explorer 5.5 that interferes with this,
      which can be resolved by upgrading to Service Pack 2 or later.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      If <A
HREF="features.safe-mode.html#ini.safe-mode"
>safe mode</A
> is enabled the
      uid of the script is added to the <VAR
CLASS="literal"
>realm</VAR
> part
      of the <VAR
CLASS="literal"
>WWW-Authenticate</VAR
> header if you set
      this header (used for HTTP Authentication).
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.headers-sent.html"
><B
CLASS="function"
>headers_sent()</B
></A
>,
     <A
HREF="function.setcookie.html"
><B
CLASS="function"
>setcookie()</B
></A
>, and the section on 
     <A
HREF="features.http-auth.html"
>HTTP authentication</A
>.
    </P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="ref.http.html"
ACCESSKEY="P"
>Înapoi</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Acas&#227;</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.headers-list.html"
ACCESSKEY="N"
>Înainte</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>HTTP Functions</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.http.html"
ACCESSKEY="U"
>Sus</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>headers_list</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>