PHP: Best way to check if input is a valid number?

Question

What is the best way of checking if input is numeric?

• 1-
• +111+
• 5xf
• 0xf

Those kind of numbers should not be valid. Onl

Answer 1

I use

if(is_numeric($value) && $value > 0 && $value == round($value, 0)){

to validate if a value is numeric, positive and integral

http://php.net/is_numeric

I don't really like ctype_digit as its not as readable as "is_numeric" and actually has less flaws when you really want to validate that a value is numeric.