whole positive number

[echousername]

i need to make sure a string is a whole positive number. i was using is_numeric but that passes negative numbers. this seems very basic but it can't find i with searches of php.net or this forum, thanks.

[WinterDragon]

what about MAKING the negative numbers into positive numbers? You could use abs() to do that. I am still looking for a way to check for negative numbers though... so bare with me.

[darkshady]

if(is_numeric($var) AND $var >= 0){
// whatever
}

[echousername]

actually for what i'm doing abs() will work fine.

thanks

[WinterDragon]

LOL I would have posted alot sooner had I known that... Oh well, glad it works... I had a fix for it when I got home anyways..

[laserlight]

I think is_numeric() will return true for floating point numbers...

maybe use is_numeric() along with abs() along with settype() or gettype()?

[tomhath]

I'd use a regular expression to ensure the string contains only digits and is a reasonable length, something like this (starting at the beginning of the string in $var, require from 1 to 8 digits, followed by the end of the string). Anything else is either a typo or someone deliberately trying to make your code fail.

if (preg_match("/^\\d{1,8}$/",  $var) ) 
...