WebStart.php

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<?php
# Protect against register_globals
# This must be done before any globals are set by the code
if ( ini_get( 'register_globals' ) ) {
        if ( isset( $_REQUEST['GLOBALS'] ) || isset( $_FILES['GLOBALS'] ) ) {
                die( '<a href="http://www.hardened-php.net/globals-problem">$GLOBALS overwrite vulnerability</a>' );
        }
        $verboten = array(
                'GLOBALS',
                '_SERVER',
                'HTTP_SERVER_VARS',
                '_GET',
                'HTTP_GET_VARS',
                '_POST',
                'HTTP_POST_VARS',
                '_COOKIE',
                'HTTP_COOKIE_VARS',
                '_FILES',
                'HTTP_POST_FILES',
                '_ENV',
                'HTTP_ENV_VARS',
                '_REQUEST',
                '_SESSION',
                'HTTP_SESSION_VARS'
        );
        foreach ( $_REQUEST as $name => $value ) {
                if( in_array( $name, $verboten ) ) {
                        header( "HTTP/1.1 500 Internal Server Error" );
                        echo "register_globals security paranoia: trying to overwrite superglobals, aborting.";
                        die( -1 );
                }
                unset( $GLOBALS[$name] );
        }
}

# bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
# We're adding it here so that it's *always* set, even for alternate entry
# points and when $wgOut gets disabled or overridden.
header( 'X-Content-Type-Options: nosniff' );

$wgRequestTime = microtime( true );
# getrusage() does not exist on the Microsoft Windows platforms, catching this
if ( function_exists ( 'getrusage' ) ) {
        $wgRUstart = getrusage();
} else {
        $wgRUstart = array();
}
unset( $IP );

# Valid web server entry point, enable includes.
# Please don't move this line to includes/Defines.php. This line essentially
# defines a valid entry point. If you put it in includes/Defines.php, then
# any script that includes it becomes an entry point, thereby defeating
# its purpose.
define( 'MEDIAWIKI', true );

# Full path to working directory.
# Makes it possible to for example to have effective exclude path in apc.
# __DIR__ breaks symlinked includes, but realpath() returns false
# if we don't have permissions on parent directories.
$IP = getenv( 'MW_INSTALL_PATH' );
if ( $IP === false ) {
        if( realpath( '.' ) ) {
                $IP = realpath( '.' );
        } else {
                $IP = dirname( __DIR__ );
        }
}

if ( isset( $_SERVER['MW_COMPILED'] ) ) {
        define( 'MW_COMPILED', 1 );
} else {
        # Get MWInit class
        require_once( "$IP/includes/Init.php" );

        # Start the autoloader, so that extensions can derive classes from core files
        require_once( "$IP/includes/AutoLoader.php" );

        # Load the profiler
        require_once( "$IP/includes/profiler/Profiler.php" );

        # Load up some global defines.
        require_once( "$IP/includes/Defines.php" );
}

# Start the profiler
$wgProfiler = array();
if ( file_exists( "$IP/StartProfiler.php" ) ) {
        require( "$IP/StartProfiler.php" );
}

wfProfileIn( 'WebStart.php-conf' );

# Load default settings
require_once( MWInit::compiledPath( "includes/DefaultSettings.php" ) );

if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
        # Use a callback function to configure MediaWiki
        MWFunction::call( MW_CONFIG_CALLBACK );
} else {
        if ( !defined( 'MW_CONFIG_FILE' ) ) {
                define( 'MW_CONFIG_FILE', MWInit::interpretedPath( 'LocalSettings.php' ) );
        }

        # LocalSettings.php is the per site customization file. If it does not exist
        # the wiki installer needs to be launched or the generated file uploaded to
        # the root wiki directory
        if( !file_exists( MW_CONFIG_FILE ) ) {
                require_once( "$IP/includes/templates/NoLocalSettings.php" );
                die();
        }

        # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
        require_once( MW_CONFIG_FILE );
}

if ( $wgEnableSelenium ) {
        require_once( MWInit::compiledPath( "includes/SeleniumWebSettings.php" ) );
}

wfProfileOut( 'WebStart.php-conf' );

wfProfileIn( 'WebStart.php-ob_start' );
# Initialise output buffering
# Check that there is no previous output or previously set up buffers, because
# that would cause us to potentially mix gzip and non-gzip output, creating a
# big mess.
if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
        if ( !defined( 'MW_COMPILED' ) ) {
                require_once( "$IP/includes/OutputHandler.php" );
        }
        ob_start( 'wfOutputHandler' );
}
wfProfileOut( 'WebStart.php-ob_start' );

if ( !defined( 'MW_NO_SETUP' ) ) {
        require_once( MWInit::compiledPath( "includes/Setup.php" ) );
}