JS Conditions function has contains

which works right in the editor to check if the string is in the control that has array as value

				'conditions' => array(
					'terms' => array(
						array(
							'name' => 'meta_elements',
							'operator' => 'contains',
							'value' => 'author',
						),
					)
				)

this option does not exists in the php version of the Conditions class

Although this works in the editor to show/hide conditional controls, the value is always null in the frontend because the missing cases.

A simple in_array would match both switches

			case 'contains':
				return false !== in_array($right_value,$left_value);
			case '!contains':
				return false === in_array( $right_value, $left_value );