wp-load.php

<?php
    /**
     * Bootstrap file for setting the ABSPATH constant
     * and loading the wp-config.php file. The wp-config.php
     * file will then load the wp-settings.php file, which
     * will then set up the WordPress environment.
     *
     * If the wp-config.php file is not found then an error
     * will be displayed asking the visitor to set up the
     * wp-config.php file.
     *
     * Will also search for wp-config.php in WordPress' parent
     * directory to allow the WordPress directory to remain
     * untouched.
     *
     * @package WordPress
     */
    /** Define ABSPATH as this file's directory */
    if(! defined('ABSPATH'))
    {
        define('ABSPATH', __DIR__.'/');
    }
    /*
     * The error_reporting() function can be disabled in php.ini. On systems where that is the case,
     * it's best to add a dummy function to the wp-config.php file, but as this call to the function
     * is run prior to wp-config.php loading, it is wrapped in a function_exists() check.
     */
    if(function_exists('error_reporting'))
    {
        /*
         * Initialize error reporting to a known set of levels.
         *
         * This will be adapted in wp_debug_mode() located in wp-includes/load.php based on WP_DEBUG.
         * @see https://www.php.net/manual/en/errorfunc.constants.php List of known error levels.
         */
        error_reporting(E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR);
    }
    /*
     * If wp-config.php exists in the WordPress root, or if it exists in the root and wp-settings.php
     * doesn't, load wp-config.php. The secondary check for wp-settings.php has the added benefit
     * of avoiding cases where the current directory is a nested installation, e.g. / is WordPress(a)
     * and /blog/ is WordPress(b).
     *
     * If neither set of conditions is true, initiate loading the setup process.
     */
    if(file_exists(ABSPATH.'wp-config.php'))
    {
        /** The config file resides in ABSPATH */
        require_once ABSPATH.'wp-config.php';
    }
    elseif(@file_exists(dirname(ABSPATH).'/wp-config.php') && ! @file_exists(dirname(ABSPATH).'/wp-settings.php'))
    {
        /** The config file resides one level above ABSPATH but is not part of another installation */
        require_once dirname(ABSPATH).'/wp-config.php';
    }
    else
    {
        // A config file doesn't exist.
        define('WPINC', 'wp-includes');
        require_once ABSPATH.WPINC.'/version.php';
        require_once ABSPATH.WPINC.'/compat.php';
        require_once ABSPATH.WPINC.'/load.php';
        // Check for the required PHP version and for the MySQL extension or a database drop-in.
        wp_check_php_mysql_versions();
        // Standardize $_SERVER variables across setups.
        wp_fix_server_vars();
        define('WP_CONTENT_DIR', ABSPATH.'wp-content');
        require_once ABSPATH.WPINC.'/functions.php';
        $path = wp_guess_url().'/wp-admin/setup-config.php';
        // Redirect to setup-config.php.
        if(! str_contains($_SERVER['REQUEST_URI'], 'setup-config'))
        {
            header('Location: '.$path);
            exit;
        }
        wp_load_translations_early();
        // Die with an error message.
        $die = '<p>'.sprintf(/* translators: %s: wp-config.php */ __("There doesn't seem to be a %s file. It is needed before the installation can continue."), '<code>wp-config.php</code>').'</p>';
        $die .= '<p>'.sprintf(/* translators: 1: Documentation URL, 2: wp-config.php */ __('Need more help? <a href="%1$s">Read the support article on %2$s</a>.'), __('https://wordpress.org/documentation/article/editing-wp-config-php/'), '<code>wp-config.php</code>').'</p>';
        $die .= '<p>'.sprintf(/* translators: %s: wp-config.php */ __("You can create a %s file through a web interface, but this doesn't work for all server setups. The safest way is to manually create the file."), '<code>wp-config.php</code>').'</p>';
        $die .= '<p><a href="'.$path.'" class="button button-large">'.__('Create a Configuration File').'</a></p>';
        wp_die($die, __('WordPress &rsaquo; Error'));
    }