Find whether a given integer is a power of 3 or not | Returns true if n is power of 3 , else false ; The maximum power of 3 value that integer can hold is 1162261467 ( 3 ^ 19 ) . ; Driver code
< ? php function check ( $ n ) { return 1162261467 % $ n == 0 ; } $ n = 9 ; if ( check ( $ n ) ) echo ( " Yes " ) ; else echo ( " No " ) ; ? >