Check if value is increment of 5

[dc_jt]

Hi I have a form where a user enters a value and I need to check if the value is an increment of 5 i.e 5,10,15,20,25 etc.

 

I am thinking of dividing the value they enter by 5 and if it is a round number then it is correct if not then it is incorrect but does anyone know how to check this? Is there an is_round() function or anything similar?

 

Thanks

[mattal999]

I think I'll have a go at making you a function:

 

<?php

is_divisible_by($number, $divby) {
    $number = $number / $divby;
    if(is_int($number)) {
        return true;
    } else {
        return false;
    }
}

?>

 

Untested code.

[ToonMariner]

<?php
if (!($foo%5))
{
    // this IS a multiple of 5 as %foo%5 will evaluate to 0 ie false
}
else
{
    // %foo%5 >0 so a remainer exists
}
?>

[dc_jt]

Thanks for the quick replies. ToonMariner's almost works but it accepts values such as 10.50 which it shouldnt. Is there a way around this?

 

Thanks

[dc_jt]

Infact it looks as though mattal999 works fine, thanks!

[mattal999]

Infact it looks as though mattal999 works fine, thanks!

 

No problem. Just noticed that I forgot the function declaration.

 

<?php

function is_divisible_by($number, $divby) {
    $number = $number / $divby;
    if(is_int($number)) {
        return true;
    } else {
        return false;
    }
}

?>

[dc_jt]

Infact it looks as though mattal999 works fine, thanks!

 

No problem. Just noticed that I forgot the function declaration.

 

<?php

function is_divisible_by($number, $divby) {
    $number = $number / $divby;
    if(is_int($number)) {
        return true;
    } else {
        return false;
    }
}

?>

 

Dont worry I added that myself Thanks again.

[Adam]

10.50 would work because PHP converts all numbers to integers before using with modulus (%), effectively leaving 10. You could just add to the if condition though and save yourself the need for a function (unless you plan on re-using this code several times?) or to simplify the function:

 

if (!$x % 5 || strstr($x, '.'))
{
    echo 'not a multiple!';
}
else
{
    echo 'is a multiple!';
}