Function Params for Multiple Type Hinting
// Multiple type hinting in one parameter
function myage(int|float|string $age){
echo $age;
}
myage("forty eight");
Here the $age parameter can be integer, float or string.
PHP Data Type Hinting of Parameter(s)
Type Hinting
- Primitive types: int, float, bool, string.
- Classes and interfaces: Any class or interface name.
- Arrays: with the array keyword.
- Callable: for functions or objects that implement the invoke method.
- Nullable types: by prefixing with a ?.
- Iterables: with the iterable keyword, which includes both arrays and objects implementing the
Traversable interface. - Union types: introduced in PHP 8, where a parameter can accept multiple types.
// Type Hinting - int, float, bool, string
function myage(int $age){
echo $age."\n";
}
myage(5);