WP_Font_Utils::get_font_face_slug( array $settings ): string

104	public static function get_font_face_slug( $settings ) {105		$defaults = array(106			'fontFamily'   => '',107			'fontStyle'    => 'normal',108			'fontWeight'   => '400',109			'fontStretch'  => '100%',110			'unicodeRange' => 'U+0-10FFFF',111		);112		$settings = wp_parse_args( $settings, $defaults );113		if ( function_exists( 'mb_strtolower' ) ) {114			$font_family = mb_strtolower( $settings['fontFamily'] );115		} else {116			$font_family = strtolower( $settings['fontFamily'] );117		}118		$font_style    = strtolower( $settings['fontStyle'] );119		$font_weight   = strtolower( $settings['fontWeight'] );120		$font_stretch  = strtolower( $settings['fontStretch'] );121		$unicode_range = strtoupper( $settings['unicodeRange'] );122 123		// Convert weight keywords to numeric strings.124		$font_weight = str_replace( array( 'normal', 'bold' ), array( '400', '700' ), $font_weight );125 126		// Convert stretch keywords to numeric strings.127		$font_stretch_map = array(128			'ultra-condensed' => '50%',129			'extra-condensed' => '62.5%',130			'condensed'       => '75%',131			'semi-condensed'  => '87.5%',132			'normal'          => '100%',133			'semi-expanded'   => '112.5%',134			'expanded'        => '125%',135			'extra-expanded'  => '150%',136			'ultra-expanded'  => '200%',137		);138		$font_stretch     = str_replace( array_keys( $font_stretch_map ), array_values( $font_stretch_map ), $font_stretch );139 140		$slug_elements = array( $font_family, $font_style, $font_weight, $font_stretch, $unicode_range );141 142		$slug_elements = array_map(143			function ( $elem ) {144				// Remove quotes to normalize font-family names, and ';' to use as a separator.145				$elem = trim( str_replace( array( '"', "'", ';' ), '', $elem ) );146 147				// Normalize comma separated lists by removing whitespace in between items,148				// but keep whitespace within items (e.g. "Open Sans" and "OpenSans" are different fonts).149				// CSS spec for whitespace includes: U+000A LINE FEED, U+0009 CHARACTER TABULATION, or U+0020 SPACE,150				// which by default are all matched by \s in PHP.151				return preg_replace( '/,\s+/', ',', $elem );152			},153			$slug_elements154		);155 156		return sanitize_text_field( implode( ';', $slug_elements ) );157	}