Check if variable is a number and positive integer in PHP?

Question

For example, say:

How do I check if variable

Answer 1

is_int is only for type detection. And request parameters are string by default. So it won't work. http://php.net/is_int

A type independent working solution:

if(preg_match('/^\d+$/D',$post_id) && ($post_id>0)){
   print "Positive integer!";
}