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 $age."\n";
}
myage(5);
PHP function with Params Default value
Sometimes functions with parameters need to be set with a default value to make it optional.
// Function with Params Default value
function sum($x,$y=5){
$num1=$x;
$num2=$y;
echo $num1+$num2.”\n”;
}
sum(2);
sum(5,9);
Here $y=5 is the default value of parameter $y.
PHP functions with Params (Parameter)
Adding parameter(s) within function called functions with Params.
//functions with params
function sum($x,$y) {
$num1=$x;
$num2=$y;
echo $num1+$num2."<br />";
}
sum(2,3);
sum(4,5);
sum(100,300);
PHP User-Defined Functions
User-defined functions are functions created by the programmer. They’re defined using the function keyword. The functions are different from built in function, and reusable.
// user defined function
function sum() {
$num1=10;
$num2=20;
echo $num1+$num2;
}
sum(); // call the function
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