Which is the most suitable function?

[newbtophp]

Which is the most suitable function, for validing the id (id is an auto increment in sql), is_int, ctype_digit, or is_numeric?

 

<?php

//always numbers...
$id = $_GET['id'];

if(is_int($id)){

//proceed...
}


if(ctype_digit($id)){

//proceed...

}


if(is_numeric($id)){

//proceed...

}

?>

 

[premiso]

is_int would be my preference, but you could also just static cast the get data to an integer and be safe:

 

$id = (int)$_GET['id'];

 

Will force the get variable to be converted to an int. Either or should be fine.

 

EDIT:

Since you expect an INT, use that to check it. If you wanted any number, double int etc, then is_numeric would be the method of choice. Just an FYI, you check the exact type you are expecting, if only that type is allowed.

[wildteen88]

As you are getting the id from the url? All values in the query string are sent as strings. is_int will expect an integer value. So you're better of using is_numeric when checking to see if $_GET['id'] is a number. You'd then type cast $_GET['id'] (or use intval) to convert it to an integer. For example

 

if(isset($_GET['id']) && is_numeric($_GET['id']))
{
    $id = (int) $_GET['id'];
}

[newbtophp]

Thanks, both of you

 

I'll be using the INT type cast, for sure.