Sophie: php-manual-es-4.3.0-2mdk noarch

php-manual-es-4.3.0-2mdk.noarch.rpm

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>headers_sent</H1
><DIV
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><P
>    (PHP 3&#62;= 3.0.8, PHP 4 )</P
>headers_sent&nbsp;--&nbsp;Checks if or where headers have been sent</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23469"
></A
><H2
>Description</H2
>boolean <B
CLASS="methodname"
>headers_sent</B
> ( [string &#38;file [, int &#38;line]])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>headers_sent()</B
> will return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if no HTTP headers
     have already been sent or <TT
CLASS="constant"
><B
>TRUE</B
></TT
> otherwise. If the optional
     <TT
CLASS="parameter"
><I
>file</I
></TT
> and <TT
CLASS="parameter"
><I
>line</I
></TT
> parameters
     are set, <B
CLASS="function"
>headers_sent()</B
> will put the php source
     file name and line number where output started in the <TT
CLASS="parameter"
><I
>file</I
></TT
>
     and <TT
CLASS="parameter"
><I
>line</I
></TT
> variables.
    </P
><P
>&#13;     You can't add any more header lines using the <A
HREF="function.header.html"
><B
CLASS="function"
>header()</B
></A
> 
     function once the header block has already been sent. Using this function 
     you can at least prevent getting HTTP header related error messages.
     Another option is to use <A
HREF="ref.outcontrol.html"
>Output Buffering</A
>.
    </P
><DIV
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><P
><B
>New parameters: </B
>
      The optional <TT
CLASS="parameter"
><I
>file</I
></TT
> and <TT
CLASS="parameter"
><I
>line</I
></TT
> 
      parameters where added in PHP 4.3.0.
     </P
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><P
><B
>Ejemplo 1. Examples using <B
CLASS="function"
>headers_sent()</B
></B
></P
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><PRE
CLASS="php"
>&#60;?php

// If no headers are sent, send one
if (!headers_sent()) {
    header ('Location: http://www.example.com/');
    exit;
}
  
// An example using the optional file and line parameters, as of PHP 4.3.0
// Note that $filename and $linenum are passed in for later use.
// Do not assign them values beforehand.
if (!headers_sent($filename, $linenum)) {
    header ('Location: http://www.example.com/');
    exit;

// You would most likely trigger an error here.
} else {

    print "Headers already sent in $filename on line $linenum\n" .
          "Cannot redirect, for now please click this &#60;a " .
          "href=\"http://www.example.com\"&#62;link&#60;/a&#62; instead\n";
    exit;
}

?&#62;</PRE
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>&#13;     See also <A
HREF="function.ob-start.html"
><B
CLASS="function"
>ob_start()</B
></A
>, <A
HREF="function.trigger-error.html"
><B
CLASS="function"
>trigger_error()</B
></A
>, 
     and <A
HREF="function.header.html"
><B
CLASS="function"
>header()</B
></A
> for a more detailed discussion of the 
     matters involved.
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