global $wpdb;
		$options = array();
		$res     = $wpdb->get_col( "SELECT SQL_NO_CACHE option_name FROM $wpdb->options WHERE option_name LIKE 'dgwt_wcas_%'" );

		if ( ! empty( $res ) && is_array( $res ) ) {
			$options = $res;
		}

		return $options;
	}

	/**
	 * Load necessary user files to handle current_user_can() in SHORTINIT mode
	 *
	 * @return void
	 */
	public static function loadUserFiles__premium_only() {
		require_once ABSPATH . WPINC . '/default-constants.php';
		wp_plugin_directory_constants();
		wp_cookie_constants();
		require_once ABSPATH . WPINC . '/rest-api.php';
		require_once ABSPATH . WPINC . '/kses.php';
		require_once ABSPATH . WPINC . '/class-wp-user.php';
		require_once ABSPATH . WPINC . '/class-wp-roles.php';
		require_once ABSPATH . WPINC . '/class-wp-role.php';
		require_once ABSPATH . WPINC . '/class-wp-session-tokens.php';
		require_once ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php';
		require_once ABSPATH . WPINC . '/user.php';
		require_once ABSPATH . WPINC . '/pluggable.php';
		require_once ABSPATH . WPINC . '/capabilities.php';
	}

	/**
	 * Does the "Shop manager" role have access to the plugin settings?
	 *
	 * @return bool
	 */
	public static function shopManagerHasAccess() {
		return defined( 'DGWT_WCAS_ALLOW_SHOP_MANAGER_ACCESS' ) && DGWT_WCAS_ALLOW_SHOP_MANAGER_ACCESS;
	}

	/**
	 * Clear phrase before processing regex expression.
	 * Some user inputs might contain special characters which should be escaped.
	 *
	 * @return string
	 */
	public static function escPhraseForRegex( $phrase ) {

		$phrase = preg_replace_callback( "/([!@#$&()\-\[\]{}\\`.+,\/\"\\'])/", function ( $matches ) {
			return '\\' . $matches[0];
		}, $phrase );

		return $phrase;
	}

	/**
	 * Esc not allowed HTML tags for No Results text
	 *
	 * @return string
	 */
	public static function ksesNoResults( $content ) {

		$content = wp_kses( $content, array(
			'div'  => array(
				'class' => array(),
			),
			'span' => array(
				'class' => array(),
			),
			'a'    => array(
				'href' => array(),
			),
			'br'   => array(),
			'p'    => array(),
			'em'   => array(),
			'b'    => array(),
			'ol'   => array(),
			'ul'   => array(),
			'li'   => array(),
			'h1'   => array(),
			'h2'   => array(),
			'h3'   => array(),
			'h4'   => array(),
			'h5'   => array(),
			'h6'   => array()
		) );

		return $content;
	}

	/**
	 * Convert text to Greeklish
	 *
	 * @param string $text
	 *
	 * @return string
	 */
	public static function convertToGreeklish__premium_only( $text ) {
		$greekLatinMap = array(
			'ευα' => 'eva',
			'ευη' => 'evi',
			'ευε' => 'eve',
			'ευκ' => 'efk',
			'ευμ' => 'evm',
			'χτ'  => 'kt',
			'ντ'  => 'nt',
			'ευ'  => 'ef',
			'ά'   => 'a',
			'ώ'   => 'o',
			'έ'   => 'e',
			'ό'   => 'o',
			'ί'   => 'i',
			'ή'   => 'i',
			'ϊ'   => 'i',
			'ϋ'   => 'i',
			'ύ'   => 'i',
			'λλ'  => 'l',
			'σσ'  => 's',
			'τζ'  => 'g',
			'γγ'  => 'g',
			'γκ'  => 'g',
			'κκ'  => 'k',
			'μμ'  => 'm',
			'νν'  => 'n',
			'φφ'  => 'f',
			'ρρ'  => 'r',
			'ττ'  => 't',
			'αι'  => 'e',
			'οι'  => 'i',
			'ει'  => 'i',
			'υι'  => 'i',
			'ου'  => 'ou',
			'σ'   => 's',
			'τ'   => 't',
			'υ'   => 'i',
			'φ'   => 'f',
			'χ'   => 'x',
			'ψ'   => 'ps',
			'ω'   => 'o',
			'α'   => 'a',
			'β'   => 'v',
			'γ'   => 'g',
			'δ'   => 'd',
			'ε'   => 'e',
			'ζ'   => 'z',
			'η'   => 'i',
			'θ'   => '',
			'ι'   => 'i',
			'κ'   => 'k',
			'λ'   => 'l',
			'μ'   => 'm',
			'ν'   => 'n',
			'ξ'   => 'ks',
			'ο'   => 'o',
			'ρ'   => 'r',
			'π'   => 'p',
			'oi'  => 'i',
			'mb'  => 'mp',
			'ei'  => 'i',
			'll'  => 'l',
			'gk'  => 'g',
			'kk'  => 'k',
			'ff'  => 'f',
			'mm'  => 'm',
			'nn'  => 'n',
			'rr'  => 'r',
			'tt'  => 't',
			'ph'  => 'f',
			'oy'  => 'ou',
			'ai'  => 'e',
			'ss'  => 's',
			'th'  => '',
			'w'   => 'o',
			'h'   => 'i',
			'd'   => 'nt',
			'b'   => 'mp',
			'c'   => 'k',
			'y'   => 'i',
		);

		return strtr( mb_strtolower( $text ), $greekLatinMap );
	}

	/**
	 * Check if the text contains Greek characters
	 *
	 * @param string $text
	 *
	 * @return bool
	 */
	public static function isGreekText__premium_only( $text ) {
		preg_match_all( '/[\p{Greek}]+/u', $text, $matches, PREG_SET_ORDER, 0 );

		return ! empty( $matches );
	}

	/**
	 * Remove Greek accents
	 *
	 * @param string $text The text to process.
	 *
	 * @return string
	 */
	public static function removeGreekAccents( $text ) {
		$chars = array(
			'Ά' => 'Α',
			'ά' => 'α',
			'Έ' => 'Ε',
			'έ' => 'α',
			'Ί' => 'Ι',
			'ί' => 'ι',
			'ΐ' => 'ϊ',
			'Ύ' => 'Υ',
			'ύ' => 'υ',
			'ΰ' => 'ϋ',
			'Ή' => 'Η',
			'ή' => 'η',
			'Ό' => 'Ο',
			'ό' => 'ο',
			'Ώ' => 'Ω',
			'ώ' => 'ω',
		);

		return strtr( $text, $chars );
	}

	/**
	 * Test if phrase contains blacklisted term
	 *
	 * @param string $phrase Search phrase.
	 *
	 * @return bool
	 */
	public static function phraseContainsBlacklistedTerm( $phrase ) {
		$blacklistedTerms = apply_filters( 'dgwt/wcas/blacklisted_terms', array() );
		if ( is_array( $blacklistedTerms ) ) {
			foreach ( $blacklistedTerms as $term ) {
				if ( mb_stripos( $phrase, $term ) !== false ) {
					return true;
				}
			}
		}

		if (
			apply_filters( 'dgwt/wcas/blacklisted_terms/check_js', true ) &&
			self::containsJsScript( $phrase )
		) {
			return true;
		}

		return false;
	}

	/**
	 * Get specific label of the post type
	 *
	 * @param string|\WP_Post_Type $postType
	 * @param string $label
	 *
	 * @return string
	 */
	public static function getPostTypeLabel( $postType, $label ) {

		$text  = '';
		$obj   = null;
		$label = sanitize_key( $label );

		if ( is_string( $postType ) ) {
			$obj = get_post_type_object( $postType );
		}

		if ( is_object( $postType ) && is_a( $postType, 'WP_Post_Type' ) ) {
			$obj = $postType;
		}

		if ( ! empty( $obj->labels ) && ! empty( $obj->labels->$label ) ) {
			$text = $obj->labels->$label;
		}

		return $text;
	}

	/**
	 * Check if the string contains JS script
	 *
	 * @param string $text
	 *
	 * @return bool
	 */
	public static function containsJsScript( $text ) {
		return ! empty( $text ) && preg_match( '/<script[^>]*?>/', $text );
	}

	/**
	 * Remove content of <script> and <style> tag.
	 * Based on {@see wp_strip_all_tags()}.
	 *
	 * @param string $text
	 *
	 * @return bool
	 */
	public static function stripScripts( $text ) {
		if ( empty( $text ) ) {
			return '';
		}

		return preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $text );
	}

	/**
	 * Format HTML output
	 *
	 * @param string $html
	 * @param string $context Available contexts: name, sku, rating, price, description, stock_status, read_more, attribute_label, attribute_value
	 *
	 * @return string
	 */
	public static function secureHtmlOutput( $html, $context = '' ) {
		$output = wp_kses_post( $html );

		return apply_filters( 'dgwt/wcas/secure_html_output', $output, $context, $html );
	}
}