index.php

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<?php
# Bail on old versions of PHP.  Pretty much every other file in the codebase
# has structures (try/catch, foo()->bar(), etc etc) which throw parse errors in
# PHP 4. Setup.php and ObjectCache.php have structures invalid in PHP 5.0 and
# 5.1, respectively.
if ( !function_exists( 'version_compare' ) || version_compare( phpversion(), '5.3.2' ) < 0 ) {
    // We need to use dirname( __FILE__ ) here cause __DIR__ is PHP5.3+
    require dirname( __FILE__ ) . '/includes/PHPVersionError.php';
    wfPHPVersionError( 'index.php' );
}

# Initialise common code.  This gives us access to GlobalFunctions, the
# AutoLoader, and the globals $wgRequest, $wgOut, $wgUser, $wgLang and
# $wgContLang, amongst others; it does *not* load $wgTitle
require __DIR__ . '/includes/WebStart.php';

$mediaWiki = new MediaWiki();
$mediaWiki->run();