Number validation

[DarkPrince2005]

Hi Everyone

 

Ive written that validates a couple of fields after form submission, but would like to check that the values off an input box are only numbers. does anyone know how?

[scotmcc]

Use a regular expression...

 

preg_match('/\d{3}/', 123)

 

Or, do it in JavaScript... It is usually a good idea to validate the input on the page rather than make the user wait to have you reload the page just to tell the user that he or she needed to use a specific input.

 

See: http://us.php.net/manual/en/function.preg-match.php

[DarkPrince2005]

Unfortunately javascript isn't an option as it is a mobi site

[oni-kun]

Unfortunately javascript isn't an option as it is a mobi site

 

Use regular expressions, or ever is_numeric , is_float, is_double ..How hard can this be?

[Hussam]

depends on what kind of numbers you are looking for, use one of these functions:

 

is_numeric($value);

is_float($value);

is_double($value);

 

I am not sure if there is more, but these are good enough.

 

you can use is_int($value) to check if the type of the variable is integer.

 

good luck.

[thebadbad]

ctype_digit() will strictly check for numbers (in a string) only.