php-doc-en/reference/info/functions/phpversion.xml

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  <refentry id="function.phpversion">
   <refnamediv>
    <refname>phpversion</refname>
    <refpurpose>Gets the current PHP version</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>phpversion</methodname>
      <methodparam choice="opt"><type>string</type><parameter>extension</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns a string containing the version of the currently running
     PHP parser. If the optional <parameter>extension</parameter> parameter is
     specified, <function>phpversion</function> returns the version of that
     extension, or &false; if there is no version information associated or
     the extension isn't enabled.
    </para>
    <note>
     <para>
      This information is also available in the predefined constant
      <constant>PHP_VERSION</constant>.
     </para>
    </note>
    <para>
     <example>
      <title><function>phpversion</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
// prints e.g. 'Current PHP version: 4.1.1'
echo 'Current PHP version: ' . phpversion();

// prints e.g. '2.0' or nothing if the extension isn't enabled
echo phpversion('tidy');
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also 
     <function>version_compare</function>,
     <function>phpinfo</function>, 
     <function>phpcredits</function>,
     <function>php_logo_guid</function>, and
     <function>zend_version</function>.
    </para>
   </refsect1>
  </refentry>

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