Typed
PHP 7.4 finally brings typed properties.
declare(strict_types=1);
/**
* Prior to PHP 7.4 ...
*
* Using strict data would have required ...
* to enforce the data integrity.
*
* setBirthDate(DateTime $birthday): void
* getBirthDate(): \DateTime
* To mark property can be null, ...
* prefix its type with a question mark
*/
class A
{
public DateTime $day; // Look Here
public function set($day) : void
{
$this->day = $day;
}
public function get() : String
{
return $this->day->format('d-m-Y');
}
}
class B
{
public ?String $day; // Can be null
public function __construct() {}
}
$a = new A();
$b = new B();
$a->set(new DateTime('2011-12-01'));
var_dump($a->get() == '01-12-2011'); // true
try {
$a->day = null;
$b->day = null;
} catch(TypeError $e) {
echo $e->getMessage(); // Cannot assign null A::day
}
Arrow
Arrow functions are a way of writing shorter functions.
/**
* Arrow functions, less verbose code
*/
$data = [
(object) ['id' => 1, 'name' => 'John'],
(object) ['id' => 2, 'name' => 'Mark'],
];
$A = array_map(fn($v) => $v->id, $data); // PHP > 7.4+
$B = array_map(function ($v) { // PHP < 7.4
return $v->id;
}, $data);
print_r($A); // 1, 2
print_r($B); // 1, 2
Last update: 450 days ago
