WP_Theme::get( string $header ): string|array|false

870	public function get( $header ) {871		if ( ! isset( $this->headers[ $header ] ) ) {872			return false;873		}874 875		if ( ! isset( $this->headers_sanitized ) ) {876			$this->headers_sanitized = $this->cache_get( 'headers' );877			if ( ! is_array( $this->headers_sanitized ) ) {878				$this->headers_sanitized = array();879			}880		}881 882		if ( isset( $this->headers_sanitized[ $header ] ) ) {883			return $this->headers_sanitized[ $header ];884		}885 886		// If themes are a persistent group, sanitize everything and cache it. One cache add is better than many cache sets.887		if ( self::$persistently_cache ) {888			foreach ( array_keys( $this->headers ) as $_header ) {889				$this->headers_sanitized[ $_header ] = $this->sanitize_header( $_header, $this->headers[ $_header ] );890			}891			$this->cache_add( 'headers', $this->headers_sanitized );892		} else {893			$this->headers_sanitized[ $header ] = $this->sanitize_header( $header, $this->headers[ $header ] );894		}895 896		return $this->headers_sanitized[ $header ];897	}