Dev {Tricks}

July 12, 2024 by dev

PHP nullable type hints

The parameter may be empty. That is null.

// Nullable type hints – ?

function sum(?string $age){
echo $age;
}
sum(“4.5”);
sum(null);

July 12, 2024 by dev

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.

July 12, 2024 by dev

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);

July 12, 2024 by dev

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.

July 12, 2024 by dev

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);