Ticket #33844: 33844.3.diff

src/wp-signup.php

@@ -56 +56 @@
                         .mu_register #user_email,
                         .mu_register #blogname,
                         .mu_register #user_name { width:100%; font-size: 24px; margin:5px 0; }
+                .mu_register #site-language { display: block; }
                 .mu_register .prefix_address,
                         .mu_register .suffix_address {font-size: 18px;display:inline; }
                 .mu_register label { font-weight:700; font-size:15px; display:block; margin:10px 0; }
@@ -121 +122 @@
         echo '<input name="blog_title" type="text" id="blog_title" value="'.esc_attr($blog_title).'" />';
         ?>
 
+        <?php
+        // Site Language.
+
+        /**
+         * Filter the list of available languages for front-end site signups.
+         *
+         * Passing an empty array to this hook will effectively disable output of the setting
+         * on the signup form, and the default language will be used when creating the site.
+         *
+         * Languages not already installed will be stripped.
+         *
+         * @since 4.4.0
+         *
+         * @param array $available_languages Available languages.
+         */
+        $languages = (array) apply_filters( 'signup_available_languages', get_available_languages() );
+
+        /*
+         * Strip any not-installed languages.
+         *
+         * We re-call get_available_languages() here in case a language pack was installed
+         * in the 'signup_available_languages' callback before this point.
+         */
+        $languages = array_intersect_assoc( $languages, get_available_languages() );
+
+        if ( ! empty( $languages ) ) :
+                ?>
+                <p>
+                        <label for="site-language"><?php _e( 'Site Language:' ); ?></label>
+                        <?php
+                        // Network default.
+                        $lang = get_site_option( 'WPLANG' );
+
+                        // Use English if the default isn't available.
+                        if ( ! in_array( $lang, $languages ) ) {
+                                $lang = '';
+                        }
+
+                        wp_dropdown_languages( array(
+                                'name'                        => 'WPLANG',
+                                'id'                          => 'site-language',
+                                'selected'                    => $lang,
+                                'languages'                   => $languages,
+                                'show_available_translations' => false,
+                        ) );
+                        ?>
+                </p>
+        <?php endif; // Languages. ?>
+
         <div id="privacy">
         <p class="privacy-intro">
             <label for="blog_public_on"><?php _e('Privacy:') ?></label>
@@ -330 +380 @@
                 'public'  => $public
         );
 
+        // Handle the language setting for the new site.
+        if ( ! empty( $_POST['WPLANG'] ) ) {
+
+                /** This filter is documented in wp-signup.php */
+                $languages = (array) apply_filters( 'signup_available_languages', get_available_languages() );
+
+                /*
+                 * Strip any not-installed languages.
+                 *
+                 * We re-call get_available_languages() here in case a language pack was installed
+                 * in the 'signup_available_languages' callback before this point.
+                 */
+                $installed_languages = array_intersect_assoc( $languages, get_available_languages() );
+
+                if ( in_array( $_POST['WPLANG'], $installed_languages ) ) {
+                        $language = wp_unslash( sanitize_text_field( $_POST['WPLANG'] ) );
+
+                        if ( $language ) {
+                                $blog_meta_defaults['WPLANG'] = $language;
+                        }
+                }
+
+        }
+
         /**
          * Filter the new site meta variables.
          *
@@ -339 +413 @@
          * @param array $blog_meta_defaults An array of default blog meta variables.
          */
         $meta_defaults = apply_filters( 'signup_create_blog_meta', $blog_meta_defaults );
+
         /**
          * Filter the new default site meta variables.
          *