Topic: Checking for a whole number.

[MasterACE14]

maybe, you convert the number to a string, explode() the number, use substr() and check whether past the decimal point is equal to 00 or not.

I dunno, worth a try lol

Regards ACE

[GingerRobot]

Or maybe you just stick with Barand's solution.

[hitman6003]

hitman6003, I'm not positive, but I think that you may still have floating point inaccuracies with that....

I just retried, and discovered that this is the most decimal places it will recognize before rounding:

Code: [Select]

$a['small_float'] = (float) 4.000000000000001;
Prior to that it works.

It may work with more decimal places on a 64 bit system.

[berridgeab]

Sorry to bump a post from two years ago but when I googled my question this was one of the first links that came up and it didnt solve my answer. This may prove useful to anyone trying to evaluate a whole number.

For example I needed to check the quantity a customer was entering within a shopping cart. If it wasn't a true whole number I needed to output an error.

Casting (int) doesn't help becuase Hexadecimal values still gets evaluated to its true integer value.


////////////////////////////////////////////////////////////////////////////////////////////// 
//is_wholeNumber(string $value)
//Returns TRUE if a WHOLE NUMBER
//Returns FALSE if anything else (Float, String, Hex, etc)
//////////////////////////////////////////////////////////////////////////////////////////////   
function is_wholeNumber($value)
{

if(preg_match ("/[^0-9]/", $value))

{

return FALSE;

}

return TRUE;
}


*EDIT*
opps, sorry, forgot credit to original author
http://davidwalsh.name/php-validatie-numeric-digits

[Pikachu2000]

Since by default all form data is of the string type, you can simply use ctype_digit(). No pattern necessary.

[berridgeab]

Ah yes, I should have read his comments, my bad    been a long day