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<?php
/**
 * Multisite administration functions.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/**
 * Determines whether uploaded file exceeds space quota.
 *
 * @since 3.0.0
 *
 * @param array $file An element from the `$_FILES` array for a given file.
 * @return array The `$_FILES` array element with 'error' key set if file exceeds quota. 'error' is empty otherwise.
 */
function check_upload_size( $file ) {
	if ( get_site_option( 'upload_space_check_disabled' ) ) {
		return $file;
	}

	if ( $file['error'] > 0 ) { // There's already an error.
		return $file;
	}

	if ( defined( 'WP_IMPORTING' ) ) {
		return $file;
	}

	$space_left = get_upload_space_available();

	$file_size = filesize( $file['tmp_name'] );
	if ( $space_left < $file_size ) {
		/* translators: %s: Required disk space in kilobytes. */
		$file['error'] = sprintf( __( 'Not enough space to upload. %s KB needed.' ), number_format( ( $file_size - $space_left ) / KB_IN_BYTES ) );
	}

	if ( $file_size > ( KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ) ) ) {
		/* translators: %s: Maximum allowed file size in kilobytes. */
		$file['error'] = sprintf( __( 'This file is too big. Files must be less than %s KB in size.' ), get_site_option( 'fileupload_maxk', 1500 ) );
	}

	if ( upload_is_user_over_quota( false ) ) {
		$file['error'] = __( 'You have used your space quota. Please delete files before uploading.' );
	}

	if ( $file['error'] > 0 && ! isset( $_POST['html-upload'] ) && ! wp_doing_ajax() ) {
		wp_die( $file['error'] . ' <a href="javascript:history.go(-1)">' . __( 'Back' ) . '</a>' );
	}

	return $file;
}

/**
 * Deletes a site.
 *
 * @since 3.0.0
 * @since 5.1.0 Use wp_delete_site() internally to delete the site row from the database.
 *
 * @param int  $blog_id Site ID.
 * @param bool $drop    True if site's database tables should be dropped. Default false.
 */
function wpmu_delete_blog( $blog_id, $drop = false ) {
	$blog_id = (int) $blog_id;

	$switch = false;
	if ( get_current_blog_id() !== $blog_id ) {
		$switch = true;
		switch_to_blog( $blog_id );
	}

	$blog = get_site( $blog_id );

	$current_network = get_network();

	// If a full blog object is not available, do not destroy anything.
	if ( $drop && ! $blog ) {
		$drop = false;
	}

	// Don't destroy the initial, main, or root blog.
	if ( $drop
		&& ( 1 === $blog_id || is_main_site( $blog_id )
			|| ( $blog->path === $current_network->path && $blog->domain === $current_network->domain ) )
	) {
		$drop = false;
	}

	$upload_path = trim( get_option( 'upload_path' ) );

	// If ms_files_rewriting is enabled and upload_path is empty, wp_upload_dir is not reliable.
	if ( $drop && get_site_option( 'ms_files_rewriting' ) && empty( $upload_path ) ) {
		$drop = false;
	}

	if ( $drop ) {
		wp_delete_site( $blog_id );
	} else {
		/** This action is documented in wp-includes/ms-blogs.php */
		do_action_deprecated( 'delete_blog', array( $blog_id, false ), '5.1.0' );

		$users = get_users(
			array(
				'blog_id' => $blog_id,
				'fields'  => 'ids',
			)
		);

		// Remove users from this blog.
		if ( ! empty( $users ) ) {
			foreach ( $users as $user_id ) {
				remove_user_from_blog( $user_id, $blog_id );
			}
		}

		update_blog_status( $blog_id, 'deleted', 1 );

		/** This action is documented in wp-includes/ms-blogs.php */
		do_action_deprecated( 'deleted_blog', array( $blog_id, false ), '5.1.0' );
	}

	if ( $switch ) {
		restore_current_blog();
	}
}

/**
 * Deletes a user and all of their posts from the network.
 *
 * This function:
 *
 * - Deletes all posts (of all post types) authored by the user on all sites on the network
 * - Deletes all links owned by the user on all sites on the network
 * - Removes the user from all sites on the network
 * - Deletes the user from the database
 *
 * @since 3.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $id The user ID.
 * @return bool True if the user was deleted, false otherwise.
 */
function wpmu_delete_user( $id ) {
	global $wpdb;

	if ( ! is_numeric( $id ) ) {
		return false;
	}

	$id   = (int) $id;
	$user = new WP_User( $id );

	if ( ! $user->exists() ) {
		return false;
	}

	// Global super-administrators are protected, and cannot be deleted.
	$_super_admins = get_super_admins();
	if ( in_array( $user->user_login, $_super_admins, true ) ) {
		return false;
	}

	/**
	 * Fires before a user is deleted from the network.
	 *
	 * @since MU (3.0.0)
	 * @since 5.5.0 Added the `$user` parameter.
	 *
	 * @param int     $id   ID of the user about to be deleted from the network.
	 * @param WP_User $user WP_User object of the user about to be deleted from the network.
	 */
	do_action( 'wpmu_delete_user', $id, $user );

	$blogs = get_blogs_of_user( $id );

	if ( ! empty( $blogs ) ) {
		foreach ( $blogs as $blog ) {
			switch_to_blog( $blog->userblog_id );
			remove_user_from_blog( $id, $blog->userblog_id );

			$post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $id ) );
			foreach ( (array) $post_ids as $post_id ) {
				wp_delete_post( $post_id );
			}

			// Clean links.
			$link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $id ) );

			if ( $link_ids ) {
				foreach ( $link_ids as $link_id ) {
					wp_delete_link( $link_id );
				}
			}

			restore_current_blog();
		}
	}

	$meta = $wpdb->get_col( $wpdb->prepare( "SELECT umeta_id FROM $wpdb->usermeta WHERE user_id = %d", $id ) );
	foreach ( $meta as $mid ) {
		delete_metadata_by_mid( 'user', $mid );
	}

	$wpdb->delete( $wpdb->users, array( 'ID' => $id ) );

	clean_user_cache( $user );

	/** This action is documented in wp-admin/includes/user.php */
	do_action( 'deleted_user', $id, null, $user );

	return true;
}

/**
 * Checks whether a site has used its allotted upload space.
 *
 * @since MU (3.0.0)
 *
 * @param bool $display_message Optional. If set to true and the quota is exceeded,
 *                              a warning message is displayed. Default true.
 * @return bool True if user is over upload space quota, otherwise false.
 */
function upload_is_user_over_quota( $display_message = true ) {
	if ( get_site_option( 'upload_space_check_disabled' ) ) {
		return false;
	}

	$space_allowed = get_space_allowed();
	if ( ! is_numeric( $space_allowed ) ) {
		$space_allowed = 10; // Default space allowed is 10 MB.
	}
	$space_used = get_space_used();

	if ( ( $space_allowed - $space_used ) < 0 ) {
		if ( $display_message ) {
			printf(
				/* translators: %s: Allowed space allocation. */
				__( 'Sorry, you have used your space allocation of %s. Please delete some files to upload more files.' ),
				size_format( $space_allowed * MB_IN_BYTES )
			);
		}
		return true;
	} else {
		return false;
	}
}

/**
 * Displays the amount of disk space used by the current site. Not used in core.
 *
 * @since MU (3.0.0)
 */
function display_space_usage() {
	$space_allowed = get_space_allowed();
	$space_used    = get_space_used();

	$percent_used = ( $space_used / $space_allowed ) * 100;

	$space = size_format( $space_allowed * MB_IN_BYTES );
	?>
	<strong>
	<?php
		/* translators: Storage space that's been used. 1: Percentage of used space, 2: Total space allowed in megabytes or gigabytes. */
		printf( __( 'Used: %1$s%% of %2$s' ), number_format( $percent_used ), $space );
	?>
	</strong>
	<?php
}

/**
 * Gets the remaining upload space for this site.
 *
 * @since MU (3.0.0)
 *
 * @param int $size Current max size in bytes.
 * @return int Max size in bytes.
 */
function fix_import_form_size( $size ) {
	if ( upload_is_user_over_quota( false ) ) {
		return 0;
	}
	$available = get_upload_space_available();
	return min( $size, $available );
}

/**
 * Displays the site upload space quota setting form on the Edit Site Settings screen.
 *
 * @since 3.0.0
 *
 * @param int $id The ID of the site to display the setting for.
 */
function upload_space_setting( $id ) {
	switch_to_blog( $id );
	$quota = get_option( 'blog_upload_space' );
	restore_current_blog();

	if ( ! $quota ) {
		$quota = '';
	}

	?>
	<tr>
		<th><label for="blog-upload-space-number"><?php _e( 'Site Upload Space Quota' ); ?></label></th>
		<td>
			<input type="number" step="1" min="0" style="width: 100px"
				name="option[blog_upload_space]" id="blog-upload-space-number"
				aria-describedby="blog-upload-space-desc" value="<?php echo esc_attr( $quota ); ?>" />
			<span id="blog-upload-space-desc"><span class="screen-reader-text">
				<?php
				/* translators: Hidden accessibility text. */
				_e( 'Size in megabytes' );
				?>
			</span> <?php _e( 'MB (Leave blank for network default)' ); ?></span>
		</td>
	</tr>
	<?php
}

/**
 * Cleans the user cache for a specific user.
 *
 * @since 3.0.0
 *
 * @param int $id The user ID.
 * @return int|false The ID of the refreshed user or false if the user does not exist.
 */
function refresh_user_details( $id ) {
	$id = (int) $id;

	$user = get_userdata( $id );
	if ( ! $user ) {
		return false;
	}

	clean_user_cache( $user );

	return $id;
}

/**
 * Returns the language for a language code.
 *
 * @since 3.0.0
 *
 * @param string $code Optional. The two-letter language code. Default empty.
 * @return string The language corresponding to $code if it exists. If it does not exist,
 *                then the first two letters of $code is returned.
 */
function format_code_lang( $code = '' ) {
	$code       = strtolower( substr( $code, 0, 2 ) );
	$lang_codes = array(
		'aa' => 'Afar',
		'ab' => 'Abkhazian',
		'af' => 'Afrikaans',
		'ak' => 'Akan',
		'sq' => 'Albanian',
		'am' => 'Amharic',
		'ar' => 'Arabic',
		'an' => 'Aragonese',
		'hy' => 'Armenian',
		'as' => 'Assamese',
		'av' => 'Avaric',
		'ae' => 'Avestan',
		'ay' => 'Aymara',
		'az' => 'Azerbaijani',
		'ba' => 'Bashkir',
		'bm' => 'Bambara',
		'eu' => 'Basque',
		'be' => 'Belarusian',
		'bn' => 'Bengali',
		'bh' => 'Bihari',
		'bi' => 'Bislama',
		'bs' => 'Bosnian',
		'br' => 'Breton',
		'bg' => 'Bulgarian',
		'my' => 'Burmese',
		'ca' => 'Catalan; Valencian',
		'ch' => 'Chamorro',
		'ce' => 'Chechen',
		'zh' => 'Chinese',
		'cu' => 'Church Slavic; Old Slavonic; Church Slavonic; Old Bulgarian; Old Church Slavonic',
		'cv' => 'Chuvash',
		'kw' => 'Cornish',
		'co' => 'Corsican',
		'cr' => 'Cree',
		'cs' => 'Czech',
		'da' => 'Danish',
		'dv' => 'Divehi; Dhivehi; Maldivian',
		'nl' => 'Dutch; Flemish',
		'dz' => 'Dzongkha',
		'en' => 'English',
		'eo' => 'Esperanto',
		'et' => 'Estonian',
		'ee' => 'Ewe',
		'fo' => 'Faroese',
		'fj' => 'Fijjian',
		'fi' => 'Finnish',
		'fr' => 'French',
		'fy' => 'Western Frisian',
		'ff' => 'Fulah',
		'ka' => 'Georgian',
		'de' => 'German',
		'gd' => 'Gaelic; Scottish Gaelic',
		'ga' => 'Irish',
		'gl' => 'Galician',
		'gv' => 'Manx',
		'el' => 'Greek, Modern',
		'gn' => 'Guarani',
		'gu' => 'Gujarati',
		'ht' => 'Haitian; Haitian Creole',
		'ha' => 'Hausa',
		'he' => 'Hebrew',
		'hz' => 'Herero',
		'hi' => 'Hindi',
		'ho' => 'Hiri Motu',
		'hu' => 'Hungarian',
		'ig' => 'Igbo',
		'is' => 'Icelandic',
		'io' => 'Ido',
		'ii' => 'Sichuan Yi',
		'iu' => 'Inuktitut',
		'ie' => 'Interlingue',
		'ia' => 'Interlingua (International Auxiliary Language Association)',
		'id' => 'Indonesian',
		'ik' => 'Inupiaq',
		'it' => 'Italian',
		'jv' => 'Javanese',
		'ja' => 'Japanese',
		'kl' => 'Kalaallisut; Greenlandic',
		'kn' => 'Kannada',
		'ks' => 'Kashmiri',
		'kr' => 'Kanuri',
		'kk' => 'Kazakh',
		'km' => 'Central Khmer',
		'ki' => 'Kikuyu; Gikuyu',
		'rw' => 'Kinyarwanda',
		'ky' => 'Kirghiz; Kyrgyz',
		'kv' => 'Komi',
		'kg' => 'Kongo',
		'ko' => 'Korean',
		'kj' => 'Kuanyama; Kwanyama',
		'ku' => 'Kurdish',
		'lo' => 'Lao',
		'la' => 'Latin',
		'lv' => 'Latvian',
		'li' => 'Limburgan; Limburger; Limburgish',
		'ln' => 'Lingala',
		'lt' => 'Lithuanian',
		'lb' => 'Luxembourgish; Letzeburgesch',
		'lu' => 'Luba-Katanga',
		'lg' => 'Ganda',
		'mk' => 'Macedonian',
		'mh' => 'Marshallese',
		'ml' => 'Malayalam',
		'mi' => 'Maori',
		'mr' => 'Marathi',
		'ms' => 'Malay',
		'mg' => 'Malagasy',
		'mt' => 'Maltese',
		'mo' => 'Moldavian',
		'mn' => 'Mongolian',
		'na' => 'Nauru',
		'nv' => 'Navajo; Navaho',
		'nr' => 'Ndebele, South; South Ndebele',
		'nd' => 'Ndebele, North; North Ndebele',
		'ng' => 'Ndonga',
		'ne' => 'Nepali',
		'nn' => 'Norwegian Nynorsk; Nynorsk, Norwegian',
		'nb' => 'Bokmål, Norwegian, Norwegian Bokmål',
		'no' => 'Norwegian',
		'ny' => 'Chichewa; Chewa; Nyanja',
		'oc' => 'Occitan, Provençal',
		'oj' => 'Ojibwa',
		'or' => 'Oriya',
		'om' => 'Oromo',
		'os' => 'Ossetian; Ossetic',
		'pa' => 'Panjabi; Punjabi',
		'fa' => 'Persian',
		'pi' => 'Pali',
		'pl' => 'Polish',
		'pt' => 'Portuguese',
		'ps' => 'Pushto',
		'qu' => 'Quechua',
		'rm' => 'Romansh',
		'ro' => 'Romanian',
		'rn' => 'Rundi',
		'ru' => 'Russian',
		'sg' => 'Sango',
		'sa' => 'Sanskrit',
		'sr' => 'Serbian',
		'hr' => 'Croatian',
		'si' => 'Sinhala; Sinhalese',
		'sk' => 'Slovak',
		'sl' => 'Slovenian',
		'se' => 'Northern Sami',
		'sm' => 'Samoan',
		'sn' => 'Shona',
		'sd' => 'Sindhi',
		'so' => 'Somali',
		'st' => 'Sotho, Southern',
		'es' => 'Spanish; Castilian',
		'sc' => 'Sardinian',
		'ss' => 'Swati',
		'su' => 'Sundanese',
		'sw' => 'Swahili',
		'sv' => 'Swedish',
		'ty' => 'Tahitian',
		'ta' => 'Tamil',
		'tt' => 'Tatar',
		'te' => 'Telugu',
		'tg' => 'Tajik',
		'tl' => 'Tagalog',
		'th' => 'Thai',
		'bo' => 'Tibetan',
		'ti' => 'Tigrinya',
		'to' => 'Tonga (Tonga Islands)',
		'tn' => 'Tswana',
		'ts' => 'Tsonga',
		'tk' => 'Turkmen',
		'tr' => 'Turkish',
		'tw' => 'Twi',
		'ug' => 'Uighur; Uyghur',
		'uk' => 'Ukrainian',
		'ur' => 'Urdu',
		'uz' => 'Uzbek',
		've' => 'Venda',
		'vi' => 'Vietnamese',
		'vo' => 'Volapük',
		'cy' => 'Welsh',
		'wa' => 'Walloon',
		'wo' => 'Wolof',
		'xh' => 'Xhosa',
		'yi' => 'Yiddish',
		'yo' => 'Yoruba',
		'za' => 'Zhuang; Chuang',
		'zu' => 'Zulu',
	);

	/**
	 * Filters the language codes.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param string[] $lang_codes Array of key/value pairs of language codes where key is the short version.
	 * @param string   $code       A two-letter designation of the language.
	 */
	$lang_codes = apply_filters( 'lang_codes', $lang_codes, $code );
	return strtr( $code, $lang_codes );
}

/**
 * Displays an access denied message when a user tries to view a site's dashboard they
 * do not have access to.
 *
 * @since 3.2.0
 * @access private
 */
function _access_denied_splash() {
	if ( ! is_user_logged_in() || is_network_admin() ) {
		return;
	}

	$blogs = get_blogs_of_user( get_current_user_id() );

	if ( wp_list_filter( $blogs, array( 'userblog_id' => get_current_blog_id() ) ) ) {
		return;
	}

	$blog_name = get_bloginfo( 'name' );

	if ( empty( $blogs ) ) {
		wp_die(
			sprintf(
				/* translators: 1: Site title. */
				__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
				$blog_name
			),
			403
		);
	}

	$output = '<p>' . sprintf(
		/* translators: 1: Site title. */
		__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
		$blog_name
	) . '</p>';
	$output .= '<p>' . __( 'If you reached this screen by accident and meant to visit one of your own sites, here are some shortcuts to help you find your way.' ) . '</p>';

	$output .= '<h3>' . __( 'Your Sites' ) . '</h3>';
	$output .= '<table>';

	foreach ( $blogs as $blog ) {
		$output .= '<tr>';
		$output .= "<td>{$blog->blogname}</td>";
		$output .= '<td><a href="' . esc_url( get_admin_url( $blog->userblog_id ) ) . '">' . __( 'Visit Dashboard' ) . '</a> | ' .
			'<a href="' . esc_url( get_home_url( $blog->userblog_id ) ) . '">' . __( 'View Site' ) . '</a></td>';
		$output .= '</tr>';
	}

	$output .= '</table>';

	wp_die( $output, 403 );
}

/**
 * Checks if the current user has permissions to import new users.
 *
 * @since 3.0.0
 *
 * @param string $permission A permission to be checked. Currently not used.
 * @return bool True if the user has proper permissions, false if they do not.
 */
function check_import_new_users( $permission ) {
	if ( ! current_user_can( 'manage_network_users' ) ) {
		return false;
	}

	return true;
}
// See "import_allow_fetch_attachments" and "import_attachment_size_limit" filters too.

/**
 * Generates and displays a drop-down of available languages.
 *
 * @since 3.0.0
 *
 * @param string[] $lang_files Optional. An array of the language files. Default empty array.
 * @param string   $current    Optional. The current language code. Default empty.
 */
function mu_dropdown_languages( $lang_files = array(), $current = '' ) {
	$flag   = false;
	$output = array();

	foreach ( (array) $lang_files as $val ) {
		$code_lang = basename( $val, '.mo' );

		if ( 'en_US' === $code_lang ) { // American English.
			$flag          = true;
			$ae            = __( 'American English' );
			$output[ $ae ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $ae . '</option>';
		} elseif ( 'en_GB' === $code_lang ) { // British English.
			$flag          = true;
			$be            = __( 'British English' );
			$output[ $be ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $be . '</option>';
		} else {
			$translated            = format_code_lang( $code_lang );
			$output[ $translated ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . esc_html( $translated ) . '</option>';
		}
	}

	if ( false === $flag ) { // WordPress English.
		$output[] = '<option value=""' . selected( $current, '', false ) . '>' . __( 'English' ) . '</option>';
	}

	// Order by name.
	uksort( $output, 'strnatcasecmp' );

	/**
	 * Filters the languages available in the dropdown.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param string[] $output     Array of HTML output for the dropdown.
	 * @param string[] $lang_files Array of available language files.
	 * @param string   $current    The current language code.
	 */
	$output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current );

	echo implode( "\n\t", $output );
}

/**
 * Displays an admin notice to upgrade all sites after a core upgrade.
 *
 * @since 3.0.0
 *
 * @global int    $wp_db_version WordPress database version.
 * @global string $pagenow       The filename of the current screen.
 *
 * @return void|false Void on success. False if the current user is not a super admin.
 */
function site_admin_notice() {
	global $wp_db_version, $pagenow;

	if ( ! current_user_can( 'upgrade_network' ) ) {
		return false;
	}

	if ( 'upgrade.php' === $pagenow ) {
		return;
	}

	if ( (int) get_site_option( 'wpmu_upgrade_site' ) !== $wp_db_version ) {
		$upgrade_network_message = sprintf(
			/* translators: %s: URL to Upgrade Network screen. */
			__( 'Thank you for Updating! Please visit the <a href="%s">Upgrade Network</a> page to update all your sites.' ),
			esc_url( network_admin_url( 'upgrade.php' ) )
		);

		wp_admin_notice(
			$upgrade_network_message,
			array(
				'type'               => 'warning',
				'additional_classes' => array( 'update-nag', 'inline' ),
				'paragraph_wrap'     => false,
			)
		);
	}
}

/**
 * Avoids a collision between a site slug and a permalink slug.
 *
 * In a subdirectory installation this will make sure that a site and a post do not use the
 * same subdirectory by checking for a site with the same name as a new post.
 *
 * @since 3.0.0
 *
 * @param array $data    An array of post data.
 * @param array $postarr An array of posts. Not currently used.
 * @return array The new array of post data after checking for collisions.
 */
function avoid_blog_page_permalink_collision( $data, $postarr ) {
	if ( is_subdomain_install() ) {
		return $data;
	}
	if ( 'page' !== $data['post_type'] ) {
		return $data;
	}
	if ( ! isset( $data['post_name'] ) || '' === $data['post_name'] ) {
		return $data;
	}
	if ( ! is_main_site() ) {
		return $data;
	}
	if ( isset( $data['post_parent'] ) && $data['post_parent'] ) {
		return $data;
	}

	$post_name = $data['post_name'];
	$c         = 0;

	while ( $c < 10 && get_id_from_blogname( $post_name ) ) {
		$post_name .= mt_rand( 1, 10 );
		++$c;
	}

	if ( $post_name !== $data['post_name'] ) {
		$data['post_name'] = $post_name;
	}

	return $data;
}

/**
 * Handles the display of choosing a user's primary site.
 *
 * This displays the user's primary site and allows the user to choose
 * which site is primary.
 *
 * @since 3.0.0
 */
function choose_primary_blog() {
	?>
	<table class="form-table" role="presentation">
	<tr>
	<?php /* translators: My Sites label. */ ?>
		<th scope="row"><label for="primary_blog"><?php _e( 'Primary Site' ); ?></label></th>
		<td>
		<?php
		$all_blogs    = get_blogs_of_user( get_current_user_id() );
		$primary_blog = (int) get_user_meta( get_current_user_id(), 'primary_blog', true );
		if ( count( $all_blogs ) > 1 ) {
			$found = false;
			?>
			<select name="primary_blog" id="primary_blog">
				<?php
				foreach ( (array) $all_blogs as $blog ) {
					if ( $blog->userblog_id === $primary_blog ) {
						$found = true;
					}
					?>
					<option value="<?php echo $blog->userblog_id; ?>"<?php selected( $primary_blog, $blog->userblog_id ); ?>><?php echo esc_url( get_home_url( $blog->userblog_id ) ); ?></option>
					<?php
				}
				?>
			</select>
			<?php
			if ( ! $found ) {
				$blog = reset( $all_blogs );
				update_user_meta( get_current_user_id(), 'primary_blog', $blog->userblog_id );
			}
		} elseif ( 1 === count( $all_blogs ) ) {
			$blog = reset( $all_blogs );
			echo esc_url( get_home_url( $blog->userblog_id ) );
			if ( $blog->userblog_id !== $primary_blog ) { // Set the primary blog again if it's out of sync with blog list.
				update_user_meta( get_current_user_id(), 'primary_blog', $blog->userblog_id );
			}
		} else {
			_e( 'Not available' );
		}
		?>
		</td>
	</tr>
	</table>
	<?php
}

/**
 * Determines whether or not this network from this page can be edited.
 *
 * By default editing of network is restricted to the Network Admin for that `$network_id`.
 * This function allows for this to be overridden.
 *
 * @since 3.1.0
 *
 * @param int $network_id The network ID to check.
 * @return bool True if network can be edited, false otherwise.
 */
function can_edit_network( $network_id ) {
	if ( get_current_network_id() === (int) $network_id ) {
		$result = true;
	} else {
		$result = false;
	}

	/**
	 * Filters whether this network can be edited from this page.
	 *
	 * @since 3.1.0
	 *
	 * @param bool $result     Whether the network can be edited from this page.
	 * @param int  $network_id The network ID to check.
	 */
	return apply_filters( 'can_edit_network', $result, $network_id );
}

/**
 * Prints thickbox image paths for Network Admin.
 *
 * @since 3.1.0
 *
 * @access private
 */
function _thickbox_path_admin_subfolder() {
	?>
<script type="text/javascript">
var tb_pathToImage = "<?php echo esc_js( includes_url( 'js/thickbox/loadingAnimation.gif', 'relative' ) ); ?>";
</script>
	<?php
}

/**
 * @param array $users
 * @return bool
 */
function confirm_delete_users( $users ) {
	$current_user = wp_get_current_user();
	if ( ! is_array( $users ) || empty( $users ) ) {
		return false;
	}
	?>
	<h1><?php esc_html_e( 'Users' ); ?></h1>

	<?php if ( 1 === count( $users ) ) : ?>
		<p><?php _e( 'You have chosen to delete the user from all networks and sites.' ); ?></p>
	<?php else : ?>
		<p><?php _e( 'You have chosen to delete the following users from all networks and sites.' ); ?></p>
	<?php endif; ?>

	<form action="users.php?action=dodelete" method="post">
	<input type="hidden" name="dodelete" />
	<?php
	wp_nonce_field( 'ms-users-delete' );
	$site_admins = get_super_admins();
	$admin_out   = '<option value="' . esc_attr( $current_user->ID ) . '">' . $current_user->user_login . '</option>';
	?>
	<table class="form-table" role="presentation">
	<?php
	$allusers = (array) $_POST['allusers'];
	foreach ( $allusers as $user_id ) {
		if ( '' !== $user_id && '0' !== $user_id ) {
			$delete_user = get_userdata( $user_id );

			if ( ! current_user_can( 'delete_user', $delete_user->ID ) ) {
				wp_die(
					sprintf(
						/* translators: %s: User login. */
						__( 'Warning! User %s cannot be deleted.' ),
						$delete_user->user_login
					)
				);
			}

			if ( in_array( $delete_user->user_login, $site_admins, true ) ) {
				wp_die(
					sprintf(
						/* translators: %s: User login. */
						__( 'Warning! User cannot be deleted. The user %s is a network administrator.' ),
						'<em>' . $delete_user->user_login . '</em>'
					)
				);
			}
			?>
			<tr>
				<th scope="row"><?php echo $delete_user->user_login; ?>
					<?php echo '<input type="hidden" name="user[]" value="' . esc_attr( $user_id ) . '" />' . "\n"; ?>
				</th>
			<?php
			$blogs = get_blogs_of_user( $user_id, true );

			if ( ! empty( $blogs ) ) {
				?>
				<td><fieldset><p><legend>
				<?php
				printf(
					/* translators: %s: User login. */
					__( 'What should be done with content owned by %s?' ),
					'<em>' . $delete_user->user_login . '</em>'
				);
				?>
				</legend></p>
				<?php
				foreach ( (array) $blogs as $key => $details ) {
					$blog_users = get_users(
						array(
							'blog_id' => $details->userblog_id,
							'fields'  => array( 'ID', 'user_login' ),
						)
					);

					if ( is_array( $blog_users ) && ! empty( $blog_users ) ) {
						$user_site     = "<a href='" . esc_url( get_home_url( $details->userblog_id ) ) . "'>{$details->blogname}</a>";
						$user_dropdown = '<label for="reassign_user" class="screen-reader-text">' .
								/* translators: Hidden accessibility text. */
								__( 'Select a user' ) .
							'</label>';
						$user_dropdown .= "<select name='blog[$user_id][$key]' id='reassign_user'>";
						$user_list      = '';

						foreach ( $blog_users as $user ) {
							if ( ! in_array( (int) $user->ID, $allusers, true ) ) {
								$user_list .= "<option value='{$user->ID}'>{$user->user_login}</option>";
							}
						}

						if ( '' === $user_list ) {
							$user_list = $admin_out;
						}

						$user_dropdown .= $user_list;
						$user_dropdown .= "</select>\n";
						?>
						<ul style="list-style:none;">
							<li>
								<?php
								/* translators: %s: Link to user's site. */
								printf( __( 'Site: %s' ), $user_site );
								?>
							</li>
							<li><label><input type="radio" id="delete_option0" name="delete[<?php echo $details->userblog_id . '][' . $delete_user->ID; ?>]" value="delete" checked="checked" />
							<?php _e( 'Delete all content.' ); ?></label></li>
							<li><label><input type="radio" id="delete_option1" name="delete[<?php echo $details->userblog_id . '][' . $delete_user->ID; ?>]" value="reassign" />
							<?php _e( 'Attribute all content to:' ); ?></label>
							<?php echo $user_dropdown; ?></li>
						</ul>
						<?php
					}
				}
				echo '</fieldset></td></tr>';
			} else {
				?>
				<td><p><?php _e( 'User has no sites or content and will be deleted.' ); ?></p></td>
			<?php } ?>
			</tr>
			<?php
		}
	}

	?>
	</table>
	<?php
	/** This action is documented in wp-admin/users.php */
	do_action( 'delete_user_form', $current_user, $allusers );

	if ( 1 === count( $users ) ) :
		?>
		<p><?php _e( 'Once you hit &#8220;Confirm Deletion&#8221;, the user will be permanently removed.' ); ?></p>
	<?php else : ?>
		<p><?php _e( 'Once you hit &#8220;Confirm Deletion&#8221;, these users will be permanently removed.' ); ?></p>
		<?php
	endif;

	submit_button( __( 'Confirm Deletion' ), 'primary' );
	?>
	</form>
	<?php
	return true;
}

/**
 * Prints JavaScript in the header on the Network Settings screen.
 *
 * @since 4.1.0
 */
function network_settings_add_js() {
	?>
<script type="text/javascript">
jQuery( function($) {
	var languageSelect = $( '#WPLANG' );
	$( 'form' ).on( 'submit', function() {
		/*
		 * Don't show a spinner for English and installed languages,
		 * as there is nothing to download.
		 */
		if ( ! languageSelect.find( 'option:selected' ).data( 'installed' ) ) {
			$( '#submit', this ).after( '<span class="spinner language-install-spinner is-active" />' );
		}
	});
} );
</script>
	<?php
}

/**
 * Outputs the HTML for a network's "Edit Site" tabular interface.
 *
 * @since 4.6.0
 *
 * @global string $pagenow The filename of the current screen.
 *
 * @param array $args {
 *     Optional. Array or string of Query parameters. Default empty array.
 *
 *     @type int    $blog_id  The site ID. Default is the current site.
 *     @type array  $links    The tabs to include with (label|url|cap) keys.
 *     @type string $selected The ID of the selected link.
 * }
 */
function network_edit_site_nav( $args = array() ) {

	/**
	 * Filters the links that appear on site-editing network pages.
	 *
	 * Default links: 'site-info', 'site-users', 'site-themes', and 'site-settings'.
	 *
	 * @since 4.6.0
	 *
	 * @param array $links {
	 *     An array of link data representing individual network admin pages.
	 *
	 *     @type array $link_slug {
	 *         An array of information about the individual link to a page.
	 *
	 *         $type string $label Label to use for the link.
	 *         $type string $url   URL, relative to `network_admin_url()` to use for the link.
	 *         $type string $cap   Capability required to see the link.
	 *     }
	 * }
	 */
	$links = apply_filters(
		'network_edit_site_nav_links',
		array(
			'site-info'     => array(
				'label' => __( 'Info' ),
				'url'   => 'site-info.php',
				'cap'   => 'manage_sites',
			),
			'site-users'    => array(
				'label' => __( 'Users' ),
				'url'   => 'site-users.php',
				'cap'   => 'manage_sites',
			),
			'site-themes'   => array(
				'label' => __( 'Themes' ),
				'url'   => 'site-themes.php',
				'cap'   => 'manage_sites',
			),
			'site-settings' => array(
				'label' => __( 'Settings' ),
				'url'   => 'site-settings.php',
				'cap'   => 'manage_sites',
			),
		)
	);

	// Parse arguments.
	$parsed_args = wp_parse_args(
		$args,
		array(
			'blog_id'  => isset( $_GET['blog_id'] ) ? (int) $_GET['blog_id'] : 0,
			'links'    => $links,
			'selected' => 'site-info',
		)
	);

	// Setup the links array.
	$screen_links = array();

	// Loop through tabs.
	foreach ( $parsed_args['links'] as $link_id => $link ) {

		// Skip link if user can't access.
		if ( ! current_user_can( $link['cap'], $parsed_args['blog_id'] ) ) {
			continue;
		}

		// Link classes.
		$classes = array( 'nav-tab' );

		// Aria-current attribute.
		$aria_current = '';

		// Selected is set by the parent OR assumed by the $pagenow global.
		if ( $parsed_args['selected'] === $link_id || $link['url'] === $GLOBALS['pagenow'] ) {
			$classes[]    = 'nav-tab-active';
			$aria_current = ' aria-current="page"';
		}

		// Escape each class.
		$esc_classes = implode( ' ', $classes );

		// Get the URL for this link.
		$url = add_query_arg( array( 'id' => $parsed_args['blog_id'] ), network_admin_url( $link['url'] ) );

		// Add link to nav links.
		$screen_links[ $link_id ] = '<a href="' . esc_url( $url ) . '" id="' . esc_attr( $link_id ) . '" class="' . $esc_classes . '"' . $aria_current . '>' . esc_html( $link['label'] ) . '</a>';
	}

	// All done!
	echo '<nav class="nav-tab-wrapper wp-clearfix" aria-label="' . esc_attr__( 'Secondary menu' ) . '">';
	echo implode( '', $screen_links );
	echo '</nav>';
}

/**
 * Returns the arguments for the help tab on the Edit Site screens.
 *
 * @since 4.9.0
 *
 * @return array Help tab arguments.
 */
function get_site_screen_help_tab_args() {
	return array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' =>
			'<p>' . __( 'The menu is for editing information specific to individual sites, particularly if the admin area of a site is unavailable.' ) . '</p>' .
			'<p>' . __( '<strong>Info</strong> &mdash; The site URL is rarely edited as this can cause the site to not work properly. The Registered date and Last Updated date are displayed. Network admins can mark a site as archived, spam, deleted and mature, to remove from public listings or disable.' ) . '</p>' .
			'<p>' . __( '<strong>Users</strong> &mdash; This displays the users associated with this site. You can also change their role, reset their password, or remove them from the site. Removing the user from the site does not remove the user from the network.' ) . '</p>' .
			'<p>' . sprintf(
				/* translators: %s: URL to Network Themes screen. */
				__( '<strong>Themes</strong> &mdash; This area shows themes that are not already enabled across the network. Enabling a theme in this menu makes it accessible to this site. It does not activate the theme, but allows it to show in the site&#8217;s Appearance menu. To enable a theme for the entire network, see the <a href="%s">Network Themes</a> screen.' ),
				network_admin_url( 'themes.php' )
			) . '</p>' .
			'<p>' . __( '<strong>Settings</strong> &mdash; This page shows a list of all settings associated with this site. Some are created by WordPress and others are created by plugins you activate. Note that some fields are grayed out and say Serialized Data. You cannot modify these values due to the way the setting is stored in the database.' ) . '</p>',
	);
}

/**
 * Returns the content for the help sidebar on the Edit Site screens.
 *
 * @since 4.9.0
 *
 * @return string Help sidebar content.
 */
function get_site_screen_help_sidebar_content() {
	return '<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
		'<p>' . __( '<a href="https://developer.wordpress.org/advanced-administration/multisite/admin/#network-admin-sites-screen">Documentation on Site Management</a>' ) . '</p>' .
		'<p>' . __( '<a href="https://wordpress.org/support/forum/multisite/">Support forums</a>' ) . '</p>';
}