Is it necessary to specify the data type in PHP when calling a function like new_pwd, and what are the implications of not doing so?

It is not necessary to specify the data type when calling a function in PHP. PHP is a loosely typed language, meaning it can automatically convert data types as needed. However, specifying the data type can help improve code readability and prevent unexpected behavior. If you choose not to specify the data type, be sure to handle any potential type conversion issues that may arise.

function new_pwd(string $password) {
    // function implementation
}

$password = "my_password";
new_pwd($password);