WebStart.php

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<?php
# Die if register_globals is enabled (PHP <=5.3)
# This must be done before any globals are set by the code
if ( ini_get( 'register_globals' ) ) {
    die( 'MediaWiki does not support installations where register_globals is enabled. '
        . 'Please see <a href="https://www.mediawiki.org/wiki/register_globals">mediawiki.org</a> '
        . 'for help on how to disable it.' );
}

# 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 );
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 ) {
    $IP = realpath( '.' ) ?: dirname( __DIR__ );
}

# Load the profiler
require_once "$IP/includes/profiler/Profiler.php";
$wgRUstart = wfGetRusage() ?: array();

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

# Load composer's autoloader if present
if ( is_readable( "$IP/vendor/autoload.php" ) ) {
    require_once "$IP/vendor/autoload.php";
}

if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
    # Use a callback function to configure MediaWiki
    call_user_func( MW_CONFIG_CALLBACK );
} else {
    if ( !defined( 'MW_CONFIG_FILE' ) ) {
        define( 'MW_CONFIG_FILE', "$IP/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. Give a hint, if it is not readable by the server.
    if ( !is_readable( 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;
}

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 ) {
    require_once "$IP/includes/OutputHandler.php";
    ob_start( 'wfOutputHandler' );
}
wfProfileOut( 'WebStart.php-ob_start' );

if ( !defined( 'MW_NO_SETUP' ) ) {
    require_once "$IP/includes/Setup.php";
}