What Do You Mean Truthy? We looked at boolean values in the previous article. Booleans represent true or false. PHP Truthy Booleans, which are values that are not true or false, but when evaluated inside an expression, they can act like they are. The best examples are the integers 0 and 1. If we passed 1 to the if statement, PHP would interpret the number 1 as truthy and would execute the statement inside the body. If you pass 0 to the if statement, PHP would interpret 0 as falsy, so it would not execute the statement inside the if