Strict mode in PHP

• Affects how type hints are enforced.
• By default, PHP will try to coerce values of the wrong type to match the expected type.
• In strict mode, PHP will throw a TypeError if the provided value does not exactly match the expected type.

declare(strict_types=1);

function add(int $a, int $b): int {
return $a + $b;
}
echo add("5", "10")