checking if a number is divisible by 6 PHP

Question

I want to check if a number is divisible by 6 and if not I need to increase it until it becomes divisible   how can I do that

User · Answer

For micro-optimisation freaks   if   num   6    0       num    6 -  num   6    More evaluations of    but less branching looping   -P

User · Answer

num     6- num 6  6    no need for a while loop  Modulo     returns the remainder of a division  IE 20 6   2  6-2   4  20 4   24  24 is divisible by 6

User · Answer

So you want the next multiple of 6  is that it   You can divide your number by 6  then ceil it  and multiply it again    answer   ceil  foo   6    6

User · Answer

I see some of the other answers calling the modulo twice   My preference is not to ask php to do the same thing more than once  For this reason  I cache the remainder   Other devs may prefer to not generate the extra global variable or have other justifications for using modulo operator twice   Code   Demo    factor   6  for  x   0   x  lt  10     x       battery of 10 tests      number   rand  0   100        echo  Number   number Becomes         if   remainder    number    factor         if not zero          number     factor -  remainder      use cached  remainder instead of calculating again           echo   number n       Possible Output   Number  80 Becomes  84 Number  57 Becomes  60 Number  94 Becomes  96 Number  48 Becomes  48 Number  80 Becomes  84 Number  36 Becomes  36 Number  17 Becomes  18 Number  41 Becomes  42 Number  3 Becomes  6 Number  64 Becomes  66

User · Answer

Why don t you use the Modulus Operator   Try this   while   s   6    0   s      Or is this what you meant    lt      s   lt some number gt     k   s   6    if  k   0      s  s 6- k    gt

User · Answer

if   variable   6    0        echo  This number is divisible by 6         Make divisible by 6    variable     6 -   variable   6     6     faster than while for large divisors

User · Answer

Assuming  foo is an integer    answer    int   floor   foo   5    6    6

User · Answer

Simply run a while loop that will continue to loop  and increase the number  until the number is divisible by 6   while   number   6    0         number

User · Answer

result   initial number    6 - initial number   6

User · Answer

Use the Mod    modulus  operator  if   x   6    0  return 1    function nearest multiple of 6  x        if   x   6    0  return  x           return    x   6    1    6

User · Answer

if   number   6    0       number    6 -   number   6       The modulus operator gives the remainder of the division  so  number   6 is the amount left over when dividing by 6  This will be faster than doing a loop and continually rechecking   If decreasing is acceptable then this is even faster    number -   number   6

[php] checking if a number is divisible by 6 PHP

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