ROR.
	 * Uses string YOAST_SEO_DEBUG_ANALYSIS_WORKER as log level for the Analysis
	 * Worker. Defaults to INFO.
	 * Can be: TRACE, DEBUG, INFO, WARN or ERROR.
	 *
	 * @return string The log level to use.
	 */
	public static function get_analysis_worker_log_level() {
		if ( defined( 'YOAST_SEO_DEBUG' ) && YOAST_SEO_DEBUG ) {
			return defined( 'YOAST_SEO_DEBUG_ANALYSIS_WORKER' ) ? YOAST_SEO_DEBUG_ANALYSIS_WORKER : 'INFO';
		}

		return 'ERROR';
	}

	/**
	 * Returns the home url with the following modifications:
	 *
	 * In case of a multisite setup we return the network_home_url.
	 * In case of no multisite setup we return the home_url while overriding the WPML filter.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return string The home url.
	 */
	public static function get_home_url() {
		// Add a new filter to undo WPML's changing of home url.
		add_filter( 'wpml_get_home_url', array( 'WPSEO_Utils', 'wpml_get_home_url' ), 10, 2 );

		$url = home_url();

		// If the plugin is network activated, use the network home URL.
		if ( self::is_plugin_network_active() ) {
			$url = network_home_url();
		}

		remove_filter( 'wpml_get_home_url', array( 'WPSEO_Utils', 'wpml_get_home_url' ), 10 );

		return $url;
	}

	/**
	 * Returns the original URL instead of the language-enriched URL.
	 * This method gets automatically triggered by the wpml_get_home_url filter.
	 *
	 * @codeCoverageIgnore
	 *
	 * @param string $home_url The url altered by WPML. Unused.
	 * @param string $url      The url that isn't altered by WPML.
	 *
	 * @return string The original url.
	 */
	public static function wpml_get_home_url( $home_url, $url ) {
		return $url;
	}

	/**
	 * Checks if the current installation supports MyYoast access tokens.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return bool True if access_tokens are supported.
	 */
	public static function has_access_token_support() {
		return class_exists( 'WPSEO_MyYoast_Client' );
	}

	/**
	 * Prepares data for outputting as JSON.
	 *
	 * @param array $data The data to format.
	 *
	 * @return false|string The prepared JSON string.
	 */
	public static function format_json_encode( $data ) {
		$flags = 0;
		if ( version_compare( PHP_VERSION, '5.4', '>=' ) ) {
			// @codingStandardsIgnoreLine This is used in the wp_json_encode call, which checks for this.
			$flags = ( $flags | JSON_UNESCAPED_SLASHES );
		}
		if ( self::is_development_mode() ) {
			$flags = ( $flags | JSON_PRETTY_PRINT );

			/**
			 * Filter the Yoast SEO development mode.
			 *
			 * @api array $data Allows filtering of the JSON data for debug purposes.
			 */
			$data = apply_filters( 'wpseo_debug_json_data', $data );
		}

		return wp_json_encode( $data, $flags );
	}

	/**
	 * Output a Schema blob.
	 *
	 * @param array  $graph The Schema graph array to output.
	 * @param string $class The (optional) class to add to the script tag.
	 *
	 * @return bool
	 */
	public static function schema_output( $graph, $class = 'yoast-schema-graph' ) {
		if ( ! is_array( $graph ) || empty( $graph ) ) {
			return false;
		}

		// phpcs:ignore WordPress.Security.EscapeOutput -- Escaping happens in WPSEO_Utils::schema_tag, which should be whitelisted.
		echo self::schema_tag( $graph, $class );
		return true;
	}

	/**
	 * Returns a script tag with Schema blob.
	 *
	 * @param array  $graph The Schema graph array to output.
	 * @param string $class The (optional) class to add to the script tag.
	 *
	 * @return false|string A schema blob with script tags.
	 */
	public static function schema_tag( $graph, $class = 'yoast-schema-graph' ) {
		if ( ! is_array( $graph ) || empty( $graph ) ) {
			return false;
		}

		$output = array(
			'@context' => 'https://schema.org',
			'@graph'   => $graph,
		);
		return "<script type='application/ld+json' class='" . esc_attr( $class ) . "'>" . self::format_json_encode( $output ) . '</script>' . "\n";
	}

	/**
	 * Extends the allowed post tags with accessibility-related attributes.
	 *
	 * @param array $allowed_post_tags The allowed post tags.
	 * @codeCoverageIgnore
	 *
	 * @return array The allowed tags including post tags, input tags and select tags.
	 */
	public static function extend_kses_post_with_a11y( $allowed_post_tags ) {
		static $a11y_tags;

		if ( isset( $a11y_tags ) === false ) {
			$a11y_tags = array(
				'button'   => array(
					'aria-expanded' => true,
					'aria-controls' => true,
				),
				'div'      => array(
					'tabindex' => true,
				),
				// Below are attributes that are needed for backwards compatibility (WP < 5.1).
				'span'     => array(
					'aria-hidden' => true,
				),
				'input'    => array(
					'aria-describedby' => true,
				),
				'select'   => array(
					'aria-describedby' => true,
				),
				'textarea' => array(
					'aria-describedby' => true,
				),
			);

			// Add the global allowed attributes to each html element.
			$a11y_tags = array_map( '_wp_add_global_attributes', $a11y_tags );
		}

		return array_merge_recursive( $allowed_post_tags, $a11y_tags );
	}

	/**
	 * Extends the allowed post tags with input, select and option tags.
	 *
	 * @param array $allowed_post_tags The allowed post tags.
	 * @codeCoverageIgnore
	 *
	 * @return array The allowed tags including post tags, input tags, select tags and option tags.
	 */
	public static function extend_kses_post_with_forms( $allowed_post_tags ) {
		static $input_tags;

		if ( isset( $input_tags ) === false ) {
			$input_tags = array(
				'input' => array(
					'accept'          => true,
					'accesskey'       => true,
					'align'           => true,
					'alt'             => true,
					'autocomplete'    => true,
					'autofocus'       => true,
					'checked'         => true,
					'contenteditable' => true,
					'dirname'         => true,
					'disabled'        => true,
					'draggable'       => true,
					'dropzone'        => true,
					'form'            => true,
					'formaction'      => true,
					'formenctype'     => true,
					'formmethod'      => true,
					'formnovalidate'  => true,
					'formtarget'      => true,
					'height'          => true,
					'hidden'          => true,
					'lang'            => true,
					'list'            => true,
					'max'             => true,
					'maxlength'       => true,
					'min'             => true,
					'multiple'        => true,
					'name'            => true,
					'pattern'         => true,
					'placeholder'     => true,
					'readonly'        => true,
					'required'        => true,
					'size'            => true,
					'spellcheck'      => true,
					'src'             => true,
					'step'            => true,
					'tabindex'        => true,
					'translate'       => true,
					'type'            => true,
					'value'           => true,
					'width'           => true,

					/*
					 * Below are attributes that are needed for backwards compatibility (WP < 5.1).
					 * They are used for the social media image in the metabox.
					 * These can be removed once we move to the React versions of the social previews.
					 */
					'data-target'     => true,
					'data-target-id'  => true,
				),
				'select' => array(
					'accesskey'       => true,
					'autofocus'       => true,
					'contenteditable' => true,
					'disabled'        => true,
					'draggable'       => true,
					'dropzone'        => true,
					'form'            => true,
					'hidden'          => true,
					'lang'            => true,
					'multiple'        => true,
					'name'            => true,
					'onblur'          => true,
					'onchange'        => true,
					'oncontextmenu'   => true,
					'onfocus'         => true,
					'oninput'         => true,
					'oninvalid'       => true,
					'onreset'         => true,
					'onsearch'        => true,
					'onselect'        => true,
					'onsubmit'        => true,
					'required'        => true,
					'size'            => true,
					'spellcheck'      => true,
					'tabindex'        => true,
					'translate'       => true,
				),
				'option' => array(
					'class'    => true,
					'disabled' => true,
					'id'       => true,
					'label'    => true,
					'selected' => true,
					'value'    => true,
				),
			);

			// Add the global allowed attributes to each html element.
			$input_tags = array_map( '_wp_add_global_attributes', $input_tags );
		}

		return array_merge_recursive( $allowed_post_tags, $input_tags );
	}

	/**
	 * Gets an array of enabled features.
	 *
	 * @return string[] The array of enabled features.
	 */
	public static function retrieve_enabled_features() {
		$enabled_features = array();
		if ( defined( 'YOAST_SEO_ENABLED_FEATURES' ) ) {
			$enabled_features = preg_split( '/,\W*/', YOAST_SEO_ENABLED_FEATURES );
		}
		// Make the array of enabled features filterable, so features can be enabled at will.
		$enabled_features = apply_filters( 'wpseo_enable_feature', $enabled_features );

		return $enabled_features;
	}

	/* ********************* DEPRECATED METHODS ********************* */

	/**
	 * Returns the language part of a given locale, defaults to english when the $locale is empty.
	 *
	 * @see WPSEO_Language_Utils::get_language()
	 *
	 * @deprecated 9.5
	 * @codeCoverageIgnore
	 *
	 * @param string $locale The locale to get the language of.
	 *
	 * @return string The language part of the locale.
	 */
	public static function get_language( $locale ) {
		_deprecated_function( __METHOD__, 'WPSEO 9.5', 'WPSEO_Language_Utils::get_language' );
		return WPSEO_Language_Utils::get_language( $locale );
	}

	/**
	 * Returns the user locale for the language to be used in the admin.
	 *
	 * WordPress 4.7 introduced the ability for users to specify an Admin language
	 * different from the language used on the front end. This checks if the feature
	 * is available and returns the user's language, with a fallback to the site's language.
	 * Can be removed when support for WordPress 4.6 will be dropped, in favor
	 * of WordPress get_user_locale() that already fallbacks to the site's locale.
	 *
	 * @see WPSEO_Language_Utils::get_user_locale()
	 *
	 * @deprecated 9.5
	 * @codeCoverageIgnore
	 *
	 * @return string The locale.
	 */
	public static function get_user_locale() {
		_deprecated_function( __METHOD__, 'WPSEO 9.5', 'WPSEO_Language_Utils::get_user_locale' );

		return WPSEO_Language_Utils::get_user_locale();
	}
}