php-doc-en/reference/url/functions/get-headers.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.get-headers" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>get_headers</refname>
  <refpurpose>Fetches all the headers sent by the server in response to a HTTP request</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>get_headers</methodname>
   <methodparam><type>string</type><parameter>url</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>format</parameter><initializer>0</initializer></methodparam>
   <methodparam choice="opt"><type>resource</type><parameter>context</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>get_headers</function> returns an array with the headers sent
   by the server in response to a HTTP request.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>url</parameter></term>
     <listitem>
      <para>
       The target URL.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>format</parameter></term>
     <listitem>
      <para>
       If the optional <parameter>format</parameter> parameter is set to non-zero,
       <function>get_headers</function> parses the response and sets the 
       array's keys.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an indexed or associative array with the headers, or &false; on
   failure.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.1.3</entry>
       <entry>
        This function now uses the default stream context, which can be
        set/changed with the <function>stream_context_set_default</function>
        function.
       </entry>
      </row>
      <row>
       <entry>7.1.0</entry>
       <entry>
        The <parameter>context</parameter> parameter was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
 &reftitle.examples;
  <para>
   <example>
    <title><function>get_headers</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$url = 'http://www.example.com';

print_r(get_headers($url));

print_r(get_headers($url, 1));
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Array
(
    [0] => HTTP/1.1 200 OK
    [1] => Date: Sat, 29 May 2004 12:28:13 GMT
    [2] => Server: Apache/1.3.27 (Unix)  (Red-Hat/Linux)
    [3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT
    [4] => ETag: "3f80f-1b6-3e1cb03b"
    [5] => Accept-Ranges: bytes
    [6] => Content-Length: 438
    [7] => Connection: close
    [8] => Content-Type: text/html
)

Array
(
    [0] => HTTP/1.1 200 OK
    [Date] => Sat, 29 May 2004 12:28:14 GMT
    [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux)
    [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
    [ETag] => "3f80f-1b6-3e1cb03b"
    [Accept-Ranges] => bytes
    [Content-Length] => 438
    [Connection] => close
    [Content-Type] => text/html
)
]]>
    </screen>
   </example>
   <example>
    <title><function>get_headers</function> using HEAD example</title>
    <programlisting role="php">
<![CDATA[
<?php
// By default get_headers uses a GET request to fetch the headers. If you
// want to send a HEAD request instead, you can do so using a stream context:
stream_context_set_default(
    array(
        'http' => array(
            'method' => 'HEAD'
        )
    )
);
$headers = get_headers('http://example.com');
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>apache_request_headers</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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