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Filename : wp-load.php
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<?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
 */

if (! defined('ABSPATH') && getenv('WP_ABSPATH')) {
  define('ABSPATH', getenv('WP_ABSPATH'));  
} elseif (! defined('ABSPATH')) {
  // https://github.com/wpscholar/wp-multi-tenancy/blob/master/wp-config.php
  // potential way of looking: class_exists( 'WP_CLI' ) ? getenv( 'PWD' ) : getenv( 'DOCUMENT_ROOT' );
  $wp_path_check = getcwd();
  if (strpos($wp_path_check, '/opt') === 0) { // too many assumptions
    $wp_path_check = dirname(getenv('DOCUMENT_ROOT').getenv('SCRIPT_NAME')); // can we just use document root
  }
  while (1) {
    if ( file_exists($wp_path_check.'/wp-config.php') ) {
      define('ABSPATH', $wp_path_check.'/');
      break;
    }
    $_wpc = dirname($wp_path_check);
    if ($_wpc == $wp_path_check) { break; }
    $wp_path_check = $_wpc;
  }
  unset($wp_path_check);
  unset($_wpc);
}

/** Define ABSPATH as this file's directory */
if ( ! defined( 'ABSPATH' ) ) {
	define( 'ABSPATH', __DIR__ . '/' );
}

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 . '/load.php';

	// Standardize $_SERVER variables across setups.
	wp_fix_server_vars();

	require_once ABSPATH . WPINC . '/functions.php';

	$path = wp_guess_url() . '/wp-admin/setup-config.php';

	/*
	 * We're going to redirect to setup-config.php. While this shouldn't result
	 * in an infinite loop, that's a silly thing to assume, don't you think? If
	 * we're traveling in circles, our last-ditch effort is "Need more help?"
	 */
	if ( false === strpos( $_SERVER['REQUEST_URI'], 'setup-config' ) ) {
		header( 'Location: ' . $path );
		exit;
	}

	define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
	require_once ABSPATH . WPINC . '/version.php';

	wp_check_php_mysql_versions();
	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. I need this before we can get started." ),
		'<code>wp-config.php</code>'
	) . '</p>';
	$die .= '<p>' . sprintf(
		/* translators: %s: Documentation URL. */
		__( "Need more help? <a href='%s'>We got it</a>." ),
		__( 'https://wordpress.org/support/article/editing-wp-config-php/' )
	) . '</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' ) );
}