#! Require PHP >= 8.0
#! This is a Sample
<?php
declare(strict_types = 1);
#[Attribute]
class Foo
{
function __construct(){
echo "Running " . __METHOD__ . PHP_EOL;
}
}
#[Attribute(Attribute::TARGET_CLASS|Attribute::IS_REPEATABLE)]
class Bar {
function __construct(?string ...$args){
echo "Running " . __METHOD__ ,
" args: " . implode(", ", $args) . PHP_EOL;
}
}
#[Attribute(Attribute::TARGET_ALL)]
class Baz {
function __construct(
private string $parameter
){
echo "Running " . __METHOD__ ,
" arg: " . $this->parameter . PHP_EOL;
}
}
#[Foo] // [0]
#[Bar] // [1]
#[Bar("Banana")] // [2]
#[Bar("Banana", "Apple", "Lemon", "Grape")] // [3]
#[Baz("The Only One")] // [4]
class Qux
{
}
// Getting class attribute with ReflectionClass
$ref = new ReflectionClass(Qux::class);
$attrs = $ref->getAttributes(); // Array of attributes
$attrs[0]->newInstance(); // "Running Foo::__construct"
$attrs[1]->newInstance(); // "Running Bar::__construct args: "
$attrs[2]->newInstance(); // "Running Bar::__construct args: Banana"
$attrs[3]->newInstance(); // "Running Bar::__construct args: Banana, Apple, Lemon, Grape"
$attrs[4]->newInstance(); // "Running Baz::__construct arg: The Only One"