Basic
Advanced
Examples
PHP 8 - What's new in PHP 8
Last modified: April 08, 2022enum
An enum is a special "class" that represents a group of constants. Adding enums will significant improve in PHP
enum Status{
case Pending;
case Active;
case Delete;
}
Example
class Student
{
public setStatus(STatus $status): void
{
//...
}
}
$student->setStatus(Status::Active)
Readonly properties
These properties can be only written once.
Example
class Student
{
public function __construct(
public readonly string $location
)
{}
}
$student = new Student('UK');
//error occur below as it can be only written once
$student->$location = 'USA'
Final class constants
Example
// this is okay
class Animal
{
public const X = "hello";
}
class Cat extends Animal
{
public const X = "bar";
}
// this is NOT okay we add keyword final infront of property
class Animal
{
final public const X = "hello";
}
class Cat extends Animal
{
final public const X = "bar";
// error occur here
}
Null-safe Operator
This provide safety in the method/property chanining when the return value or property can be null
Example
return $student->getAddress()?->getCountry()?->isoCode;
