code: protected static function unify_params( $type, $field, $default = '' ) {
  
  		$data = array_column( self::$data[ $type ], $field );
  
  		switch ( $field ) {
  			case 'media':
  			case 'footer':
  			case 'version':
  				foreach ( $data as $key => $value ) {
  					if ( $data[0] !== $value ) {
  						return $default;
  					}
  				}
  
  				return ( isset( $data[0] ) && $data[0] ) ? $data[0] : $default;
  
  			default:
  				$params = [];
  
  				foreach ( $data as $key => $value ) {
  					$params = array_merge( $params, $value );
  				}
  
  				return array_unique( $params );
  		}
  	}
docs: Obtain all the parameters of a particular field and unify them.
  
  @since 1.0.4
  
  @param string $type    → script|style.
  @param string $field   → field to unify.
  @param string $default → default param.
  
  @return array → unified parameters