diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/load.php
--- a/wp/wp-includes/load.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/load.php	Tue Dec 15 13:49:49 2020 +0100
@@ -13,40 +13,14 @@
  * @return string The HTTP protocol. Default: HTTP/1.0.
  */
 function wp_get_server_protocol() {
-	$protocol = $_SERVER['SERVER_PROTOCOL'];
-	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
+	$protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : '';
+	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ), true ) ) {
 		$protocol = 'HTTP/1.0';
 	}
 	return $protocol;
 }
 
 /**
- * Turn register globals off.
- *
- * @since 2.1.0
- * @access private
- */
-function wp_unregister_GLOBALS() {
-	if ( ! ini_get( 'register_globals' ) ) {
-		return;
-	}
-
-	if ( isset( $_REQUEST['GLOBALS'] ) ) {
-		die( 'GLOBALS overwrite attempt detected' );
-	}
-
-	// Variables that shouldn't be unset
-	$no_unset = array( 'GLOBALS', '_GET', '_POST', '_COOKIE', '_REQUEST', '_SERVER', '_ENV', '_FILES', 'table_prefix' );
-
-	$input = array_merge( $_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset( $_SESSION ) && is_array( $_SESSION ) ? $_SESSION : array() );
-	foreach ( $input as $k => $v ) {
-		if ( ! in_array( $k, $no_unset ) && isset( $GLOBALS[ $k ] ) ) {
-			unset( $GLOBALS[ $k ] );
-		}
-	}
-}
-
-/**
  * Fix `$_SERVER` variables for various setups.
  *
  * @since 3.0.0
@@ -65,22 +39,22 @@
 
 	$_SERVER = array_merge( $default_server_values, $_SERVER );
 
-	// Fix for IIS when running with PHP ISAPI
-	if ( empty( $_SERVER['REQUEST_URI'] ) || ( PHP_SAPI != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
+	// Fix for IIS when running with PHP ISAPI.
+	if ( empty( $_SERVER['REQUEST_URI'] ) || ( 'cgi-fcgi' !== PHP_SAPI && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
 
 		if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
-			// IIS Mod-Rewrite
+			// IIS Mod-Rewrite.
 			$_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
 		} elseif ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
-			// IIS Isapi_Rewrite
+			// IIS Isapi_Rewrite.
 			$_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
 		} else {
-			// Use ORIG_PATH_INFO if there is no PATH_INFO
+			// Use ORIG_PATH_INFO if there is no PATH_INFO.
 			if ( ! isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) ) {
 				$_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
 			}
 
-			// Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
+			// Some IIS + PHP configurations put the script-name in the path-info (no need to append it twice).
 			if ( isset( $_SERVER['PATH_INFO'] ) ) {
 				if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] ) {
 					$_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
@@ -89,27 +63,28 @@
 				}
 			}
 
-			// Append the query string if it exists and isn't null
+			// Append the query string if it exists and isn't null.
 			if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
 				$_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
 			}
 		}
 	}
 
-	// Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests
+	// Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests.
 	if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && ( strpos( $_SERVER['SCRIPT_FILENAME'], 'php.cgi' ) == strlen( $_SERVER['SCRIPT_FILENAME'] ) - 7 ) ) {
 		$_SERVER['SCRIPT_FILENAME'] = $_SERVER['PATH_TRANSLATED'];
 	}
 
-	// Fix for Dreamhost and other PHP as CGI hosts
+	// Fix for Dreamhost and other PHP as CGI hosts.
 	if ( strpos( $_SERVER['SCRIPT_NAME'], 'php.cgi' ) !== false ) {
 		unset( $_SERVER['PATH_INFO'] );
 	}
 
-	// Fix empty PHP_SELF
+	// Fix empty PHP_SELF.
 	$PHP_SELF = $_SERVER['PHP_SELF'];
 	if ( empty( $PHP_SELF ) ) {
-		$_SERVER['PHP_SELF'] = $PHP_SELF = preg_replace( '/(\?.*)?$/', '', $_SERVER['REQUEST_URI'] );
+		$_SERVER['PHP_SELF'] = preg_replace( '/(\?.*)?$/', '', $_SERVER['REQUEST_URI'] );
+		$PHP_SELF            = $_SERVER['PHP_SELF'];
 	}
 }
 
@@ -130,18 +105,15 @@
 	$php_version = phpversion();
 
 	if ( version_compare( $required_php_version, $php_version, '>' ) ) {
-		wp_load_translations_early();
-
 		$protocol = wp_get_server_protocol();
 		header( sprintf( '%s 500 Internal Server Error', $protocol ), true, 500 );
 		header( 'Content-Type: text/html; charset=utf-8' );
-		/* translators: 1: Current PHP version number, 2: WordPress version number, 3: Minimum required PHP version number */
-		printf( __( 'Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.' ), $php_version, $wp_version, $required_php_version );
+		printf( 'Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.', $php_version, $wp_version, $required_php_version );
 		exit( 1 );
 	}
 
 	if ( ! extension_loaded( 'mysql' ) && ! extension_loaded( 'mysqli' ) && ! extension_loaded( 'mysqlnd' ) && ! file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
-		require_once( ABSPATH . WPINC . '/functions.php' );
+		require_once ABSPATH . WPINC . '/functions.php';
 		wp_load_translations_early();
 		$args = array(
 			'exit' => false,
@@ -149,7 +121,7 @@
 		);
 		wp_die(
 			__( 'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.' ),
-			__( 'Insufficient Requirements' ),
+			__( 'Requirements Not Met' ),
 			$args
 		);
 		exit( 1 );
@@ -157,14 +129,81 @@
 }
 
 /**
+ * Retrieves the current environment type.
+ *
+ * The type can be set via the `WP_ENVIRONMENT_TYPE` global system variable,
+ * or a constant of the same name.
+ *
+ * Possible values include 'local', 'development', 'staging', 'production'.
+ * If not set, the type defaults to 'production'.
+ *
+ * @since 5.5.0
+ * @since 5.5.1 Added the 'local' type.
+ * @since 5.5.1 Removed the ability to alter the list of types.
+ *
+ * @return string The current environment type.
+ */
+function wp_get_environment_type() {
+	static $current_env = '';
+
+	if ( $current_env ) {
+		return $current_env;
+	}
+
+	$wp_environments = array(
+		'local',
+		'development',
+		'staging',
+		'production',
+	);
+
+	// Add a note about the deprecated WP_ENVIRONMENT_TYPES constant.
+	if ( defined( 'WP_ENVIRONMENT_TYPES' ) && function_exists( '_deprecated_argument' ) ) {
+		if ( function_exists( '__' ) ) {
+			/* translators: %s: WP_ENVIRONMENT_TYPES */
+			$message = sprintf( __( 'The %s constant is no longer supported.' ), 'WP_ENVIRONMENT_TYPES' );
+		} else {
+			$message = sprintf( 'The %s constant is no longer supported.', 'WP_ENVIRONMENT_TYPES' );
+		}
+
+		_deprecated_argument(
+			'define()',
+			'5.5.1',
+			$message
+		);
+	}
+
+	// Check if the environment variable has been set, if `getenv` is available on the system.
+	if ( function_exists( 'getenv' ) ) {
+		$has_env = getenv( 'WP_ENVIRONMENT_TYPE' );
+		if ( false !== $has_env ) {
+			$current_env = $has_env;
+		}
+	}
+
+	// Fetch the environment from a constant, this overrides the global system variable.
+	if ( defined( 'WP_ENVIRONMENT_TYPE' ) ) {
+		$current_env = WP_ENVIRONMENT_TYPE;
+	}
+
+	// Make sure the environment is an allowed one, and not accidentally set to an invalid value.
+	if ( ! in_array( $current_env, $wp_environments, true ) ) {
+		$current_env = 'production';
+	}
+
+	return $current_env;
+}
+
+/**
  * Don't load all of WordPress when handling a favicon.ico request.
  *
  * Instead, send the headers for a zero-length favicon and bail.
  *
  * @since 3.0.0
+ * @deprecated 5.4.0 Deprecated in favor of do_favicon().
  */
 function wp_favicon_request() {
-	if ( '/favicon.ico' == $_SERVER['REQUEST_URI'] ) {
+	if ( '/favicon.ico' === $_SERVER['REQUEST_URI'] ) {
 		header( 'Content-Type: image/vnd.microsoft.icon' );
 		exit;
 	}
@@ -173,30 +212,60 @@
 /**
  * Die with a maintenance message when conditions are met.
  *
- * Checks for a file in the WordPress root directory named ".maintenance".
- * This file will contain the variable $upgrading, set to the time the file
- * was created. If the file was created less than 10 minutes ago, WordPress
- * enters maintenance mode and displays a message.
- *
  * The default message can be replaced by using a drop-in (maintenance.php in
  * the wp-content directory).
  *
  * @since 3.0.0
  * @access private
- *
- * @global int $upgrading the unix timestamp marking when upgrading WordPress began.
  */
 function wp_maintenance() {
-	if ( ! file_exists( ABSPATH . '.maintenance' ) || wp_installing() ) {
+	// Return if maintenance mode is disabled.
+	if ( ! wp_is_maintenance_mode() ) {
 		return;
 	}
 
+	if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
+		require_once WP_CONTENT_DIR . '/maintenance.php';
+		die();
+	}
+
+	require_once ABSPATH . WPINC . '/functions.php';
+	wp_load_translations_early();
+
+	header( 'Retry-After: 600' );
+
+	wp_die(
+		__( 'Briefly unavailable for scheduled maintenance. Check back in a minute.' ),
+		__( 'Maintenance' ),
+		503
+	);
+}
+
+/**
+ * Check if maintenance mode is enabled.
+ *
+ * Checks for a file in the WordPress root directory named ".maintenance".
+ * This file will contain the variable $upgrading, set to the time the file
+ * was created. If the file was created less than 10 minutes ago, WordPress
+ * is in maintenance mode.
+ *
+ * @since 5.5.0
+ *
+ * @global int $upgrading The Unix timestamp marking when upgrading WordPress began.
+ *
+ * @return bool True if maintenance mode is enabled, false otherwise.
+ */
+function wp_is_maintenance_mode() {
 	global $upgrading;
 
-	include( ABSPATH . '.maintenance' );
-	// If the $upgrading timestamp is older than 10 minutes, don't die.
-	if ( ( time() - $upgrading ) >= 600 ) {
-		return;
+	if ( ! file_exists( ABSPATH . '.maintenance' ) || wp_installing() ) {
+		return false;
+	}
+
+	require ABSPATH . '.maintenance';
+	// If the $upgrading timestamp is older than 10 minutes, consider maintenance over.
+	if ( ( time() - $upgrading ) >= 10 * MINUTE_IN_SECONDS ) {
+		return false;
 	}
 
 	/**
@@ -213,24 +282,10 @@
 	 * @param int  $upgrading     The timestamp set in the .maintenance file.
 	 */
 	if ( ! apply_filters( 'enable_maintenance_mode', true, $upgrading ) ) {
-		return;
-	}
-
-	if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
-		require_once( WP_CONTENT_DIR . '/maintenance.php' );
-		die();
+		return false;
 	}
 
-	require_once( ABSPATH . WPINC . '/functions.php' );
-	wp_load_translations_early();
-
-	header( 'Retry-After: 600' );
-
-	wp_die(
-		__( 'Briefly unavailable for scheduled maintenance. Check back in a minute.' ),
-		__( 'Maintenance' ),
-		503
-	);
+	return true;
 }
 
 /**
@@ -314,7 +369,7 @@
 	 *
 	 * This filter runs before it can be used by plugins. It is designed for
 	 * non-web run-times. Returning false causes the `WP_DEBUG` and related
-	 * constants to not be checked and the default php values for errors
+	 * constants to not be checked and the default PHP values for errors
 	 * will be used unless you take care to update them yourself.
 	 *
 	 * @since 4.6.0
@@ -351,7 +406,7 @@
 	}
 
 	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || ( defined( 'WP_INSTALLING' ) && WP_INSTALLING ) || wp_doing_ajax() || wp_is_json_request() ) {
-		@ini_set( 'display_errors', 0 );
+		ini_set( 'display_errors', 0 );
 	}
 }
 
@@ -405,14 +460,14 @@
  *
  * @since 2.5.0
  *
- * @global wpdb $wpdb The WordPress database class.
+ * @global wpdb $wpdb WordPress database abstraction object.
  */
 function require_wp_db() {
 	global $wpdb;
 
-	require_once( ABSPATH . WPINC . '/wp-db.php' );
+	require_once ABSPATH . WPINC . '/wp-db.php';
 	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
-		require_once( WP_CONTENT_DIR . '/db.php' );
+		require_once WP_CONTENT_DIR . '/db.php';
 	}
 
 	if ( isset( $wpdb ) ) {
@@ -436,7 +491,7 @@
  * @since 3.0.0
  * @access private
  *
- * @global wpdb   $wpdb         The WordPress database class.
+ * @global wpdb   $wpdb         WordPress database abstraction object.
  * @global string $table_prefix The database table prefix.
  */
 function wp_set_wpdb_vars() {
@@ -472,7 +527,7 @@
 		'umeta_id'         => '%d',
 		'comment_karma'    => '%d',
 		'comment_count'    => '%d',
-		// multisite:
+		// Multisite:
 		'active'           => '%d',
 		'cat_id'           => '%d',
 		'deleted'          => '%d',
@@ -488,9 +543,9 @@
 	if ( is_wp_error( $prefix ) ) {
 		wp_load_translations_early();
 		wp_die(
-			/* translators: 1: $table_prefix, 2: wp-config.php */
 			sprintf(
-				__( '<strong>ERROR</strong>: %1$s in %2$s can only contain numbers, letters, and underscores.' ),
+				/* translators: 1: $table_prefix, 2: wp-config.php */
+				__( '<strong>Error</strong>: %1$s in %2$s can only contain numbers, letters, and underscores.' ),
 				'<code>$table_prefix</code>',
 				'<code>wp-config.php</code>'
 			)
@@ -545,12 +600,12 @@
 			 * that an external object cache is being used.
 			 */
 			if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
-				require_once( WP_CONTENT_DIR . '/object-cache.php' );
+				require_once WP_CONTENT_DIR . '/object-cache.php';
 				if ( function_exists( 'wp_cache_init' ) ) {
 					wp_using_ext_object_cache( true );
 				}
 
-				// Re-initialize any hooks added manually by object-cache.php
+				// Re-initialize any hooks added manually by object-cache.php.
 				if ( $wp_filter ) {
 					$wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter );
 				}
@@ -567,9 +622,11 @@
 	}
 
 	if ( ! wp_using_ext_object_cache() ) {
-		require_once( ABSPATH . WPINC . '/cache.php' );
+		require_once ABSPATH . WPINC . '/cache.php';
 	}
 
+	require_once ABSPATH . WPINC . '/cache-compat.php';
+
 	/*
 	 * If cache supports reset, reset instead of init if already
 	 * initialized. Reset signals to the cache that global IDs
@@ -607,8 +664,8 @@
 	} elseif ( ! is_blog_installed() && ! wp_installing() ) {
 		nocache_headers();
 
-		require( ABSPATH . WPINC . '/kses.php' );
-		require( ABSPATH . WPINC . '/pluggable.php' );
+		require ABSPATH . WPINC . '/kses.php';
+		require ABSPATH . WPINC . '/pluggable.php';
 
 		$link = wp_guess_url() . '/wp-admin/install.php';
 
@@ -627,18 +684,19 @@
  * @since 3.0.0
  * @access private
  *
- * @return array Files to include.
+ * @return string[] Array of absolute paths of files to include.
  */
 function wp_get_mu_plugins() {
 	$mu_plugins = array();
 	if ( ! is_dir( WPMU_PLUGIN_DIR ) ) {
 		return $mu_plugins;
 	}
-	if ( ! $dh = opendir( WPMU_PLUGIN_DIR ) ) {
+	$dh = opendir( WPMU_PLUGIN_DIR );
+	if ( ! $dh ) {
 		return $mu_plugins;
 	}
 	while ( ( $plugin = readdir( $dh ) ) !== false ) {
-		if ( substr( $plugin, -4 ) == '.php' ) {
+		if ( '.php' === substr( $plugin, -4 ) ) {
 			$mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin;
 		}
 	}
@@ -660,13 +718,13 @@
  * @since 3.0.0
  * @access private
  *
- * @return string[] $plugin_file Array of paths to plugin files relative to the plugins directory.
+ * @return string[] Array of paths to plugin files relative to the plugins directory.
  */
 function wp_get_active_and_valid_plugins() {
 	$plugins        = array();
 	$active_plugins = (array) get_option( 'active_plugins', array() );
 
-	// Check for hacks file if the option is enabled
+	// Check for hacks file if the option is enabled.
 	if ( get_option( 'hack_file' ) && file_exists( ABSPATH . 'my-hacks.php' ) ) {
 		_deprecated_file( 'my-hacks.php', '1.5.0' );
 		array_unshift( $plugins, ABSPATH . 'my-hacks.php' );
@@ -679,11 +737,11 @@
 	$network_plugins = is_multisite() ? wp_get_active_network_plugins() : false;
 
 	foreach ( $active_plugins as $plugin ) {
-		if ( ! validate_file( $plugin ) // $plugin must validate as file
-			&& '.php' == substr( $plugin, -4 ) // $plugin must end with '.php'
-			&& file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist
-			// not already included as a network plugin
-			&& ( ! $network_plugins || ! in_array( WP_PLUGIN_DIR . '/' . $plugin, $network_plugins ) )
+		if ( ! validate_file( $plugin )                     // $plugin must validate as file.
+			&& '.php' === substr( $plugin, -4 )             // $plugin must end with '.php'.
+			&& file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist.
+			// Not already included as a network plugin.
+			&& ( ! $network_plugins || ! in_array( WP_PLUGIN_DIR . '/' . $plugin, $network_plugins, true ) )
 			) {
 			$plugins[] = WP_PLUGIN_DIR . '/' . $plugin;
 		}
@@ -705,8 +763,8 @@
  *
  * @since 5.2.0
  *
- * @param array $plugins List of absolute plugin main file paths.
- * @return array Filtered value of $plugins, without any paused plugins.
+ * @param string[] $plugins Array of absolute plugin main file paths.
+ * @return string[] Filtered array of plugins, without any paused plugins.
  */
 function wp_skip_paused_plugins( array $plugins ) {
 	$paused_plugins = wp_paused_plugins()->get_all();
@@ -737,7 +795,7 @@
  * @since 5.1.0
  * @access private
  *
- * @return array Array of paths to theme directories.
+ * @return string[] Array of absolute paths to theme directories.
  */
 function wp_get_active_and_valid_themes() {
 	global $pagenow;
@@ -775,8 +833,8 @@
  *
  * @since 5.2.0
  *
- * @param array $themes List of absolute theme directory paths.
- * @return array Filtered value of $themes, without any paused themes.
+ * @param string[] $themes Array of absolute theme directory paths.
+ * @return string[] Filtered array of absolute paths to themes, without any paused themes.
  */
 function wp_skip_paused_themes( array $themes ) {
 	$paused_themes = wp_paused_themes()->get_all();
@@ -830,7 +888,7 @@
 		return true;
 	}
 
-	// Protect AJAX actions that could help resolve a fatal error should be available.
+	// Protect Ajax actions that could help resolve a fatal error should be available.
 	if ( is_protected_ajax_action() ) {
 		return true;
 	}
@@ -840,21 +898,22 @@
 	 *
 	 * This filter is only fired when an endpoint is requested which is not already protected by
 	 * WordPress core. As such, it exclusively allows providing further protected endpoints in
-	 * addition to the admin backend, login pages and protected AJAX actions.
+	 * addition to the admin backend, login pages and protected Ajax actions.
 	 *
 	 * @since 5.2.0
 	 *
-	 * @param bool $is_protected_endpoint Whether the currently requested endpoint is protected. Default false.
+	 * @param bool $is_protected_endpoint Whether the currently requested endpoint is protected.
+	 *                                    Default false.
 	 */
 	return (bool) apply_filters( 'is_protected_endpoint', false );
 }
 
 /**
- * Determines whether we are currently handling an AJAX action that should be protected against WSODs.
+ * Determines whether we are currently handling an Ajax action that should be protected against WSODs.
  *
  * @since 5.2.0
  *
- * @return bool True if the current AJAX action should be protected.
+ * @return bool True if the current Ajax action should be protected.
  */
 function is_protected_ajax_action() {
 	if ( ! wp_doing_ajax() ) {
@@ -877,13 +936,13 @@
 	);
 
 	/**
-	 * Filters the array of protected AJAX actions.
+	 * Filters the array of protected Ajax actions.
 	 *
-	 * This filter is only fired when doing AJAX and the AJAX request has an 'action' property.
+	 * This filter is only fired when doing Ajax and the Ajax request has an 'action' property.
 	 *
 	 * @since 5.2.0
 	 *
-	 * @param array $actions_to_protect Array of strings with AJAX actions to protect.
+	 * @param string[] $actions_to_protect Array of strings with Ajax actions to protect.
 	 */
 	$actions_to_protect = (array) apply_filters( 'wp_protected_ajax_actions', $actions_to_protect );
 
@@ -906,6 +965,7 @@
 function wp_set_internal_encoding() {
 	if ( function_exists( 'mb_internal_encoding' ) ) {
 		$charset = get_option( 'blog_charset' );
+		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
 		if ( ! $charset || ! @mb_internal_encoding( $charset ) ) {
 			mb_internal_encoding( 'UTF-8' );
 		}
@@ -922,13 +982,6 @@
  * @access private
  */
 function wp_magic_quotes() {
-	// If already slashed, strip.
-	if ( get_magic_quotes_gpc() ) {
-		$_GET    = stripslashes_deep( $_GET );
-		$_POST   = stripslashes_deep( $_POST );
-		$_COOKIE = stripslashes_deep( $_COOKIE );
-	}
-
 	// Escape with wpdb.
 	$_GET    = add_magic_quotes( $_GET );
 	$_POST   = add_magic_quotes( $_POST );
@@ -966,7 +1019,7 @@
  * @return object The cloned object.
  */
 function wp_clone( $object ) {
-	// Use parens for clone to accommodate PHP 4. See #17880
+	// Use parens for clone to accommodate PHP 4. See #17880.
 	return clone( $object );
 }
 
@@ -982,7 +1035,7 @@
  *
  * @since 1.5.1
  *
- * @global WP_Screen $current_screen
+ * @global WP_Screen $current_screen WordPress current screen object.
  *
  * @return bool True if inside WordPress administration interface, false otherwise.
  */
@@ -997,7 +1050,7 @@
 }
 
 /**
- * Whether the current request is for a site's admininstrative interface.
+ * Whether the current request is for a site's administrative interface.
  *
  * e.g. `/wp-admin/`
  *
@@ -1006,7 +1059,7 @@
  *
  * @since 3.1.0
  *
- * @global WP_Screen $current_screen
+ * @global WP_Screen $current_screen WordPress current screen object.
  *
  * @return bool True if inside WordPress blog administration pages.
  */
@@ -1028,9 +1081,12 @@
  * Does not check if the user is an administrator; use current_user_can()
  * for checking roles and capabilities.
  *
+ * Does not check if the site is a Multisite network; use is_multisite()
+ * for checking if Multisite is enabled.
+ *
  * @since 3.1.0
  *
- * @global WP_Screen $current_screen
+ * @global WP_Screen $current_screen WordPress current screen object.
  *
  * @return bool True if inside WordPress network administration pages.
  */
@@ -1054,7 +1110,7 @@
  *
  * @since 3.1.0
  *
- * @global WP_Screen $current_screen
+ * @global WP_Screen $current_screen WordPress current screen object.
  *
  * @return bool True if inside WordPress user administration pages.
  */
@@ -1135,9 +1191,7 @@
  * @since 3.4.0
  * @access private
  *
- * @global WP_Locale $wp_locale The WordPress date and time locale object.
- *
- * @staticvar bool $loaded
+ * @global WP_Locale $wp_locale WordPress date and time locale object.
  */
 function wp_load_translations_early() {
 	global $wp_locale;
@@ -1152,23 +1206,24 @@
 		return;
 	}
 
-	// We need $wp_local_package
+	// We need $wp_local_package.
 	require ABSPATH . WPINC . '/version.php';
 
-	// Translation and localization
+	// Translation and localization.
 	require_once ABSPATH . WPINC . '/pomo/mo.php';
 	require_once ABSPATH . WPINC . '/l10n.php';
 	require_once ABSPATH . WPINC . '/class-wp-locale.php';
 	require_once ABSPATH . WPINC . '/class-wp-locale-switcher.php';
 
-	// General libraries
+	// General libraries.
 	require_once ABSPATH . WPINC . '/plugin.php';
 
-	$locales = $locations = array();
+	$locales   = array();
+	$locations = array();
 
 	while ( true ) {
 		if ( defined( 'WPLANG' ) ) {
-			if ( '' == WPLANG ) {
+			if ( '' === WPLANG ) {
 				break;
 			}
 			$locales[] = WPLANG;
@@ -1229,8 +1284,6 @@
  *
  * @since 4.4.0
  *
- * @staticvar bool $installing
- *
  * @param bool $is_installing Optional. True to set WP into Installing mode, false to turn Installing mode off.
  *                            Omit this parameter if you only want to fetch the current status.
  * @return bool True if WP is installing, otherwise false. When a `$is_installing` is passed, the function will
@@ -1263,7 +1316,7 @@
  */
 function is_ssl() {
 	if ( isset( $_SERVER['HTTPS'] ) ) {
-		if ( 'on' == strtolower( $_SERVER['HTTPS'] ) ) {
+		if ( 'on' === strtolower( $_SERVER['HTTPS'] ) ) {
 			return true;
 		}
 
@@ -1282,8 +1335,8 @@
  * @since 2.3.0
  * @since 4.6.0 Moved from media.php to load.php.
  *
- * @link https://secure.php.net/manual/en/function.ini-get.php
- * @link https://secure.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
+ * @link https://www.php.net/manual/en/function.ini-get.php
+ * @link https://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
  *
  * @param string $value A (PHP ini) byte value, either shorthand or ordinary.
  * @return int An integer byte value.
@@ -1309,9 +1362,7 @@
  *
  * @since 4.6.0
  *
- * @staticvar array $ini_all
- *
- * @link https://secure.php.net/manual/en/function.ini-get-all.php
+ * @link https://www.php.net/manual/en/function.ini-get-all.php
  *
  * @param string $setting The name of the ini setting to check.
  * @return bool True if the value is changeable at runtime. False otherwise.
@@ -1481,7 +1532,8 @@
  *
  * @since 5.0.0
  *
- * @return bool True if Accepts or Content-Type headers contain application/json, false otherwise.
+ * @return bool True if `Accepts` or `Content-Type` headers contain `application/json`.
+ *              False otherwise.
  */
 function wp_is_json_request() {
 
@@ -1530,7 +1582,8 @@
  *
  * @since 5.2.0
  *
- * @return bool True if Accepts or Content-Type headers contain xml, false otherwise.
+ * @return bool True if `Accepts` or `Content-Type` headers contain `text/xml`
+ *              or one of the related MIME types. False otherwise.
  */
 function wp_is_xml_request() {
 	$accepted = array(