Question

I’d like to validate $_POST’s contain, that must be number. How can i check out $_POST’s contain with PHP?

for example (what i want as the result):

1876 //true
2.34 // false
erfka // false
1djs33 // false

Answer 1

ctype_digit is your friend. It checks that only digits are contained in the variable, not periods or anything other. ctype_digit doesn’t even allow negative numbers, but just digits.

It actually also checks that there is a number contained. The empty string is evaluated to false with ctype_digit.