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<refentry xml:id="function.phpversion" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>phpversion</refname>

<refpurpose>Gets the current PHP version</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type class="union"><type>string</type><type>false</type></type><methodname>phpversion</methodname>

<methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>extension</parameter><initializer>&null;</initializer></methodparam>

</methodsynopsis>

<para>

Returns a string containing the version of the currently running PHP

parser or extension.

</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>extension</parameter></term>

<listitem>

<para>

An optional extension name.

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

Returns the current PHP version as a <type>string</type>.

If a <type>string</type> argument is provided for

<parameter>extension</parameter> parameter, <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>

</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>

<parameter>extension</parameter> is nullable now.

</entry>

</row>

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title><function>phpversion</function> example</title>

<programlisting role="php">

<![CDATA[

<?php

// Prints e.g. 'Current PHP version: 8.3.12'

echo 'Current PHP version: ' . phpversion();

// Prints e.g. '1.22.3' or nothing if the extension isn't enabled

echo phpversion('zip');

?>

]]>

</programlisting>

</example>

</para>

<para>

<example>

<title><constant>PHP_VERSION_ID</constant> example and usage</title>

<programlisting role="php">

<![CDATA[

<?php

/**

* PHP_VERSION_ID is defined as a number, where the higher the number

* is, the newer a PHP version is used. It's defined as used in the above

* expression:

*

* $version_id = $major_version * 10000 + $minor_version * 100 + $release_version;

*

* Now with PHP_VERSION_ID we can check for features this PHP version

* may have, this doesn't require to use version_compare() everytime

* you check if the current PHP version may not support a feature.

*

* For example, we may here define the PHP_*_VERSION constants thats

* not available in versions prior to 5.2.7

*/

if (PHP_VERSION_ID < 50207) {

define('PHP_MAJOR_VERSION', $version[0]);

define('PHP_MINOR_VERSION', $version[1]);

define('PHP_RELEASE_VERSION', $version[2]);

// and so on, ...

}

?>

]]>

</programlisting>

</example>

</para>

</refsect1>

<refsect1 role="notes">

&reftitle.notes;

<note>

<para>

This information is also available in the predefined constant

<constant>PHP_VERSION</constant>. More versioning information

is available using the <constant>PHP_<replaceable>*</replaceable>_VERSION</constant>

constants.

</para>

</note>

<note>

<para>

Some extensions may define their own version number.

However, most bundled extension will use the PHP version as their version number.

</para>

</note>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><link linkend="reserved.constants.core">PHP_VERSION constants</link></member>

<member><function>version_compare</function></member>

<member><function>phpinfo</function></member>

<member><function>phpcredits</function></member>

<member><function>zend_version</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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