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

The most secure way

if(preg_replace('/^(\-){0,1}[0-9]+(\.[0-9]+){0,1}/', '', $value) == ""){
  //if all made of numbers "-" or ".", then yes is number;
}