Hyperfactorial of a number | function to calculate the value of hyperfactorial ; initialise the val to 1 ; returns the hyperfactorial of a number ; Driver code
< ? php function boost_hyperfactorial ( $ num ) { $ val = 1 ; for ( $ i = 1 ; $ i <= $ num ; $ i ++ ) { $ val = $ val * pow ( $ i , $ i ) ; } return $ val ; } $ num = 5 ; echo boost_hyperfactorial ( $ num ) ; ? >