WP_Site_Health::get_test_utf8mb4_support() WordPress Method

	public function get_test_utf8mb4_support() {
		global $wpdb;

		if ( ! $this->mysql_server_version ) {
			$this->prepare_sql_data();
		}

		$result = array(
			'label'       => __( 'UTF8MB4 is supported' ),
			'status'      => 'good',
			'badge'       => array(
				'label' => __( 'Performance' ),
				'color' => 'blue',
			),
			'description' => sprintf(
				'<p>%s</p>',
				__( 'UTF8MB4 is the character set WordPress prefers for database storage because it safely supports the widest set of characters and encodings, including Emoji, enabling better support for non-English languages.' )
			),
			'actions'     => '',
			'test'        => 'utf8mb4_support',
		);

		if ( ! $this->is_mariadb ) {
			if ( version_compare( $this->mysql_server_version, '5.5.3', '<' ) ) {
				$result['status'] = 'recommended';

				$result['label'] = __( 'utf8mb4 requires a MySQL update' );

				$result['description'] .= sprintf(
					'<p>%s</p>',
					sprintf(
						/* translators: %s: Version number. */
						__( 'WordPress&#8217; utf8mb4 support requires MySQL version %s or greater. Please contact your server administrator.' ),
						'5.5.3'
					)
				);
			} else {
				$result['description'] .= sprintf(
					'<p>%s</p>',
					__( 'Your MySQL version supports utf8mb4.' )
				);
			}
		} else { // MariaDB introduced utf8mb4 support in 5.5.0.
			if ( version_compare( $this->mysql_server_version, '5.5.0', '<' ) ) {
				$result['status'] = 'recommended';

				$result['label'] = __( 'utf8mb4 requires a MariaDB update' );

				$result['description'] .= sprintf(
					'<p>%s</p>',
					sprintf(
						/* translators: %s: Version number. */
						__( 'WordPress&#8217; utf8mb4 support requires MariaDB version %s or greater. Please contact your server administrator.' ),
						'5.5.0'
					)
				);
			} else {
				$result['description'] .= sprintf(
					'<p>%s</p>',
					__( 'Your MariaDB version supports utf8mb4.' )
				);
			}
		}

		if ( $wpdb->use_mysqli ) {
			// phpcs:ignore WordPress.DB.RestrictedFunctions.mysql_mysqli_get_client_info
			$mysql_client_version = mysqli_get_client_info();
		} else {
			// phpcs:ignore WordPress.DB.RestrictedFunctions.mysql_mysql_get_client_info,PHPCompatibility.Extensions.RemovedExtensions.mysql_DeprecatedRemoved
			$mysql_client_version = mysql_get_client_info();
		}

		/*
		 * libmysql has supported utf8mb4 since 5.5.3, same as the MySQL server.
		 * mysqlnd has supported utf8mb4 since 5.0.9.
		 */
		if ( false !== strpos( $mysql_client_version, 'mysqlnd' ) ) {
			$mysql_client_version = preg_replace( '/^\D+([\d.]+).*/', '$1', $mysql_client_version );
			if ( version_compare( $mysql_client_version, '5.0.9', '<' ) ) {
				$result['status'] = 'recommended';

				$result['label'] = __( 'utf8mb4 requires a newer client library' );

				$result['description'] .= sprintf(
					'<p>%s</p>',
					sprintf(
						/* translators: 1: Name of the library, 2: Number of version. */
						__( 'WordPress&#8217; utf8mb4 support requires MySQL client library (%1$s) version %2$s or newer. Please contact your server administrator.' ),
						'mysqlnd',
						'5.0.9'
					)
				);
			}
		} else {
			if ( version_compare( $mysql_client_version, '5.5.3', '<' ) ) {
				$result['status'] = 'recommended';

				$result['label'] = __( 'utf8mb4 requires a newer client library' );

				$result['description'] .= sprintf(
					'<p>%s</p>',
					sprintf(
						/* translators: 1: Name of the library, 2: Number of version. */
						__( 'WordPress&#8217; utf8mb4 support requires MySQL client library (%1$s) version %2$s or newer. Please contact your server administrator.' ),
						'libmysql',
						'5.5.3'
					)
				);
			}
		}

		return $result;
	}