Checking if a string contains an integer

Question

Do you know of a function that can check if a string contains an integer?

Here\'s how I\'d expect it to work:

holds_int(\"23\") // should return true         


        

Answer 1

ctype_digit will do the trick:

ctype_digit($str)

1. $str has to be a string
2. extra spaces are not allowed
3. no decimal points .