php-doc-en/reference/nsapi/functions/nsapi-request-headers.xml

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<refentry xml:id="function.nsapi-request-headers" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>nsapi_request_headers</refname>
  <refpurpose>Fetch all HTTP request headers</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>nsapi_request_headers</methodname>
   <void/>
  </methodsynopsis>
  <para>
   <function>nsapi_request_headers</function> gets all the HTTP headers in
   the current request. This is only supported when PHP runs as a 
   <productname>NSAPI</productname> module.
  </para>
  <note>
   <para>
    Prior to PHP 4.3.3, <function>getallheaders</function> was only 
    available for the Apache servers.  After PHP 4.3.3,
    <function>getallheaders</function> is an alias for
    <function>nsapi_request_headers</function> if you use the NSAPI module.
   </para>
  </note>
  <note>
   <para>
    You can also get at the value of the common CGI variables by
    reading them from the <varname>$_SERVER</varname> superglobal, which 
    works whether or not you are using PHP as a 
    <productname>NSAPI</productname> module.
   </para>
  </note>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an associative array with all the HTTP headers.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>nsapi_request_headers</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$headers = nsapi_request_headers();

foreach ($headers as $header => $value) {
  echo "$header: $value <br />\n";
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>

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