Best way to check for positive integer (PHP)?

Question

I need to check for a form input value to be a positive integer (not just an integer), and I noticed another snippet using the code below:

$i = $user_input_value; if (!is_numeric($i) || $i < 1 || $i != round($i)) {   return TRUE; } 

I was wondering if there's any advantage to using the three checks above, instead of just doing something like so:

$i = $user_input_value; if (!is_int($i) && $i < 1) {   return TRUE; } 

Answer 1

Not sure why there's no suggestion to use filter_var on this. I know it's an old thread, but maybe it will help someone out (after all, I ended up here, right?).

$filter_options = array(      'options' => array( 'min_range' => 0)  );   if( filter_var( $i, FILTER_VALIDATE_INT, $filter_options ) !== FALSE) {    ... } 

You could also add a maximum value as well.

$filter_options = array(     'options' => array( 'min_range' => 0,                         'max_range' => 100 ) ); 

Learn more about filters.