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<refentry xml:id="function.curl-version" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>curl_version</refname>
  <refpurpose>Gets cURL version information</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>curl_version</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Returns information about the cURL version.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an associative array with the following elements: 
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>Key</entry>
       <entry>Value description</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>version_number</entry>
       <entry>cURL 24 bit version number</entry>
      </row>
      <row>
       <entry>version</entry>
       <entry>cURL version number, as a string</entry>
      </row>
      <row>
       <entry>ssl_version_number</entry>
       <entry>OpenSSL 24 bit version number</entry>
      </row>
      <row>
       <entry>ssl_version</entry>
       <entry>OpenSSL version number, as a string</entry>
      </row>
      <row>
       <entry>libz_version</entry>
       <entry>zlib version number, as a string</entry>
      </row>
      <row>
       <entry>host</entry>
       <entry>Information about the host where cURL was built</entry>
      </row>
      <row>
       <entry>age</entry>
       <entry/>
      </row>
      <row>
       <entry>features</entry>
       <entry>A bitmask of the <literal>CURL_VERSION_XXX</literal> constants</entry>
      </row>
      <row>
       <entry>protocols</entry>
       <entry>An array of protocols names supported by cURL</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       The optional <parameter>age</parameter> parameter has been removed.
      </entry>
     </row>
     <row>
      <entry>7.4.0</entry>
      <entry>
       The optional <parameter>age</parameter> parameter has been deprecated;
       if a value is passed, it is ignored.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>curl_version</function> example</title>
    <para>
     This example will check which features that's available 
     in cURL build by using the <literal>'features'</literal> bitmask returned 
     by <function>curl_version</function>.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
// Get curl version array
$version = curl_version();

// These are the bitfields that can be used 
// to check for features in the curl build
$bitfields = Array(
            'CURL_VERSION_IPV6', 
            'CURL_VERSION_KERBEROS4', 
            'CURL_VERSION_SSL', 
            'CURL_VERSION_LIBZ'
            );


foreach($bitfields as $feature)
{
    echo $feature . ($version['features'] & constant($feature) ? ' matches' : ' does not match');
    echo PHP_EOL;
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>
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