How to check if a variable is numeric?

Question

The PHP PDO method lastInsertId () actually returns a numeric value, but it can also return something completely different, like some weird SQLSTATE code or something else. In any case, it returns a non-numeric value, I would like to register an error. Is there a way to safely verify this?

Answer 1

Use

is_int($value) 

or

 is_numeric($value) 

Answer 2

is_numeric returns true for numeric strings and false otherwise. Similar function ctype_digit .

Answer 3

is_int or is_numeric is a good way.

You can also try to cast the result to (int) and check if it is > 0 .