suggestion for IF / THEN / ELSE operator

Hello, my name is Alessandro Rosa and I'm a PHP developer from Italy. Is there any chance for you to consider the development of the following variation of the IF / THEN / ELSE ? if ( $_a in { 2, 3, 4 } ) where { 2, 3, 4 } is an array of values. Yes, I know I could supply it by creating an array and passing it to the in_array() function, but sometimes it's quite fast to write such an expression above to be evaluated, instead of creating an array, populating it then calling in_array for check. Thank you, Alessandro Rosa