Question

I have a form, and I need to check out if some values are integer. This seems unexepctedly complicated.

I tried:

if (is_int($value)) 

this doen’t work: any value return false, because the text input always sends a string type variable

if (is_numeric($value))

this works, but only check if variable is numeric. I want to know if it is an integer, so I don’t want that 1.3 is accepted.

if (is_int( (int) $value ))

Tried to use is_int, and force cast $value as integer. This doesn’t work either

So, unless there is some other solution which I’m not aware of, I guess the only way is to use
ereg("^[0-9]*$",$value)

Is there any problem with this (performance?), and aren’t there really more straightforward solutions?

Kind regards.

Answer 1

As noted by mario, ctype_digit() is the single, function way to go:

if (ctype_digit($_POST['value'])) {
  $for_santity = (int)$_POST['value'];
}

Simple. Fast. Reliable.