Check if a large number is divisible by 25 or not | Function to find that number divisible by 25 or not . ; If length of string is single digit then it 's not divisible by 25 ; Driver code
< ? php function isDivisibleBy25 ( $ str ) { $ n = strlen ( $ str ) ; if ( $ n == 1 ) return false ; return ( ( $ str [ $ n - 1 ] - '0' == 0 && $ str [ $ n - 2 ] - '0' == 0 ) || ( ( $ str [ $ n - 2 ] - '0' ) * 10 + ( $ str [ $ n - 1 ] - '0' ) ) % 25 == 0 ) ; } $ str = "76955" ; $ x = isDivisibleBy25 ( $ str ) ? " Yes " : " No ▁ " ; echo ( $ x ) ; ? >