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PHP Function Return Types

Basic Return Types

function getAge(): int {
    return 25;
}
function isAdult(int $age): bool {
    return $age >= 18;
}
echo getAge();
echo isAdult(11)

Nullable Return Type

function findUsername(int $id): ?string {
    if ($id === 1) {
    return "JohnDoe";
    }
    return null; // It's valid because of the ? before string
}
echo findUsername(2);

Return Type of void

function logMessage(string $message): void {
    echo $message;
}
logMessage("Hello");

Union Return Types

function sum($num1,$num2):int|string{
    return $num1+$num2;
}
echo sum("33","20");

 

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PHP Anonymous Functions (or Closures)

Anonymous Functions (or Closures)

  • These are functions without a name. They can be stored in variables or passed as arguments to other
    functions.

Creation & Execution Directly.

// Anonymous Functions (or Closures)

(function(){
echo "Hello Anonymous";
}) ();

 

 

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PHP Variadic Functions

Variadic Functions

  • Functions that accept an indefinite number of arguments.
  • They use the (…) spread operator
// Variadic Functions
// spread operator is ...
// spread operator does not support echo

function WorldCountryList(...$country){
print_r($country);
}
WorldCountryList("Bangladesh","India","Nepal");