Hyperfactorial of a number | function to calculate the value of hyperfactorial ; initialise the val to 1 ; 1 ^ 1 * 2 ^ 2 * 3 ^ 3. . . . ; returns the hyperfactorial of a number ; Driver code
< ? php function boost_hyperfactorial ( $ num ) { $ val = 1 ; for ( $ i = 1 ; $ i <= $ num ; $ i ++ ) { for ( $ j = 1 ; $ j <= $ i ; $ j ++ ) { $ val *= $ i ; } } return $ val ; } $ num = 5 ; echo boost_hyperfactorial ( $ num ) ; ? >