PHP 函数的最新趋势和功能

// 传统匿名函数
$fn = function($param) {
    // 函数体
};

// 箭头函数
$fn = fn($param) => {
    // 函数体
};

function sum(int $x, int $y): int {
    return $x + $y;
}

// 从数组中提取值
$array = ['name' => 'John', 'age' => 30];
[$name, $age] = $array;

// 从对象中提取值
class Person {
    public $name;
    public $age;
}

$person = new Person();
$person->name = 'Jane';
$person->age = 35;

[$name, $age] = ['name' => $person->name, 'age' => $person->age];

function sum(...$numbers) {
    $total = 0;
    foreach ($numbers as $number) {
        $total += $number;
    }
    return $total;
}

$add = fn(int $x, int $y) => $x + $y;

echo $add(5, 10); // 输出：15