Is there a difference between is_int() and ctype_digit()?

Question

Is one more preferred, or performs better over the other?

Answer 1

is_int() returns true if the argument is an integer type, ctype_digit() takes a string argument and returns true if all the characters in the string are digits.

Example:

           is_int:        ctype_digit:
123        true            false
12.3       false           false
"123"      false           true
"12.3"     false           false

Answer 2

The last thing you should be worrying about is how fast one of these is. There is no way that checking a string for being an integer is going to be a bottleneck in your code.

Answer 3

Thanks. Just needed a sanity check.

Answer 4

If you don't really care if the argument is a int type or a string with numbers, use is_numeric. It will return true for floats also, tho.

Answer 5

Little correction here

ctype_digit returns true for "123" AND for 123.

Ramito