[SOLVED] is_numeric not working

[Ninjakreborn]

This whole time I thought it did, the client said he could still enter letter values.  I did that, it wasn't working for some reasons letter's are still going through.  What is a good way to make 100% sure the value is a number.

[jimmi8]

wow, really? You could always use a regular expression i suppose but is_numeric should work shouldnt it. R u sure the codes right?

[Ninjakreborn]

Yes, it should work however, it's not.

 

Generic tests (ALL numbers) works.

 

Then when I retested, checked on php.net it'sn ot meant to be fullproof.  It's not meant to work as a definitive.  if you have number's, and hten some letter's it let's it got through depending on the combination.

Anybody have something they use that is fullproof?

[jimmi8]

well i didnt know that!

 

like i said a reg exp is probably good here.

 

Theres a good one at php.net on the is_numeric page in the comments bit:

 

http://uk.php.net/is_numeric

 

hope that helps

[Balmung-San]

I would use if(!ereg("[0-9]+",$data)){ //send out an error

 

Or shorten the regex more into "\d+".

 

This will make sure that $data is any number of digits long. If you wanted to limit it you could use "[0-9]{min,max}". However, this won't allow for negatives vs. positives. But you could easily add that by putting a "-" in the very beginning of your character set, i.e. "[-0-9]+" should check all numbers as okay, whether or not they're negative.

[hvle]

// should be true
var_dump(is_numeric('0123.45e052'));
var_dump(is_numeric('0xFF'));

// should be false
var_dump(is_numeric('0123.45e'));
var_dump(is_numeric('01e23.456'));

 

output:

bool(true)

bool(true)

bool(false)

bool(false)

 

as expected, I think is_numeric is fullproof

[jimmi8]

yeah so it checks if a string has a numeric value in it...not that its just numbers only which i think is what the issue is here!

 

Its kinda foolproof but doesnt check if the string is wholely numeric

[Jenk]

No, it accepts valid scientific notation's, as well as plain numbers.

 

Use ctype_digit() for number checking, or a simple:

if (strval($var) === strval(intval($var)))

[Ninjakreborn]

You were right originally, it ended up being a problem with the array from the very beginning.

I am marking this as solved, thanks for the help.  You helped me track down the problem.