WordPress 4.4

[autoinstalls/wordpress.git] / wp-includes / load.php

diff --git a/wp-includes/load.php b/wp-includes/load.php
index a6ad0222a29be9a2411e795cf8b2ebecd76b3820..9d247baa9024a2fcbbe1e055f2c68c839d4fd36a 100644 (file)
--- a/wp-includes/load.php
+++ b/wp-includes/load.php
@@ -7,6 +7,21 @@
  * @package WordPress
  */
 
+/**
+ * Return the HTTP protocol sent by the server.
+ *
+ * @since 4.4.0
+ *
+ * @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 = 'HTTP/1.0';
+       }
+       return $protocol;
+}
+
 /**
  * Turn register globals off.
  *
@@ -111,13 +126,19 @@ function wp_check_php_mysql_versions() {
 
        if ( version_compare( $required_php_version, $php_version, '>' ) ) {
                wp_load_translations_early();
+
+               $protocol = wp_get_server_protocol();
+               header( sprintf( '%s 500 Internal Server Error', $protocol ), true, 500 );
                header( 'Content-Type: text/html; charset=utf-8' );
                die( sprintf( __( 'Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.' ), $php_version, $wp_version, $required_php_version ) );
        }
 
        if ( ! extension_loaded( 'mysql' ) && ! extension_loaded( 'mysqli' ) && ! file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
                wp_load_translations_early();
-                header( 'Content-Type: text/html; charset=utf-8' );
+
+               $protocol = wp_get_server_protocol();
+               header( sprintf( '%s 500 Internal Server Error', $protocol ), true, 500 );
+               header( 'Content-Type: text/html; charset=utf-8' );
                die( __( 'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.' ) );
        }
 }
@@ -132,7 +153,6 @@ function wp_check_php_mysql_versions() {
 function wp_favicon_request() {
        if ( '/favicon.ico' == $_SERVER['REQUEST_URI'] ) {
                header('Content-Type: image/vnd.microsoft.icon');
-               header('Content-Length: 0');
                exit;
        }
 }
@@ -154,7 +174,7 @@ function wp_favicon_request() {
  * @global int $upgrading the unix timestamp marking when upgrading WordPress began.
  */
 function wp_maintenance() {
-       if ( !file_exists( ABSPATH . '.maintenance' ) || defined( 'WP_INSTALLING' ) )
+       if ( ! file_exists( ABSPATH . '.maintenance' ) || wp_installing() )
                return;
 
        global $upgrading;
@@ -171,9 +191,7 @@ function wp_maintenance() {
 
        wp_load_translations_early();
 
-       $protocol = $_SERVER["SERVER_PROTOCOL"];
-       if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
-               $protocol = 'HTTP/1.0';
+       $protocol = wp_get_server_protocol();
        header( "$protocol 503 Service Unavailable", true, 503 );
        header( 'Content-Type: text/html; charset=utf-8' );
        header( 'Retry-After: 600' );
@@ -379,7 +397,13 @@ function wp_set_wpdb_vars() {
 
        if ( is_wp_error( $prefix ) ) {
                wp_load_translations_early();
-               wp_die( __( '<strong>ERROR</strong>: <code>$table_prefix</code> in <code>wp-config.php</code> can only contain numbers, letters, and underscores.' ) );
+               wp_die(
+                       /* translators: 1: $table_prefix 2: wp-config.php */
+                       sprintf( __( '<strong>ERROR</strong>: %1$s in %2$s can only contain numbers, letters, and underscores.' ),
+                               '<code>$table_prefix</code>',
+                               '<code>wp-config.php</code>'
+                       )
+               );
        }
 }
 
@@ -464,12 +488,12 @@ function wp_start_object_cache() {
  */
 function wp_not_installed() {
        if ( is_multisite() ) {
-               if ( ! is_blog_installed() && ! defined( 'WP_INSTALLING' ) ) {
+               if ( ! is_blog_installed() && ! wp_installing() ) {
                        nocache_headers();
 
                        wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );
                }
-       } elseif ( ! is_blog_installed() && ! defined( 'WP_INSTALLING' ) ) {
+       } elseif ( ! is_blog_installed() && ! wp_installing() ) {
                nocache_headers();
 
                require( ABSPATH . WPINC . '/kses.php' );
@@ -535,7 +559,7 @@ function wp_get_active_and_valid_plugins() {
                array_unshift( $plugins, ABSPATH . 'my-hacks.php' );
        }
 
-       if ( empty( $active_plugins ) || defined( 'WP_INSTALLING' ) )
+       if ( empty( $active_plugins ) || wp_installing() )
                return $plugins;
 
        $network_plugins = is_multisite() ? wp_get_active_network_plugins() : false;
@@ -837,3 +861,34 @@ function wp_load_translations_early() {
 
        $wp_locale = new WP_Locale();
 }
+
+/**
+ * Check or set whether WordPress is in "installation" mode.
+ *
+ * If the `WP_INSTALLING` constant is defined during the bootstrap, `wp_installing()` will default to `true`.
+ *
+ * @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
+ *              report whether WP was in installing mode prior to the change to `$is_installing`.
+ */
+function wp_installing( $is_installing = null ) {
+       static $installing = null;
+
+       // Support for the `WP_INSTALLING` constant, defined before WP is loaded.
+       if ( is_null( $installing ) ) {
+               $installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;
+       }
+
+       if ( ! is_null( $is_installing ) ) {
+               $old_installing = $installing;
+               $installing = $is_installing;
+               return (bool) $old_installing;
+       }
+
+       return (bool) $installing;
+}