PHP code example of divengine / laze

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

divengine / laze example snippets

use divengine\laze;

// Define a lazy constant
laze::define('MY_CONSTANT', fn() => computeExpensiveValue());

$value = laze::read('MY_CONSTANT');

use divengine\laze;

// Define a lazy constant. Simulate an expensive computation
laze::define('MY_CONSTANT', fn() => return rand(1, 100)); 

// First access, the closure is evaluated
$value = laze::read('MY_CONSTANT');
echo $value; // Outputs the evaluated value

// Subsequent access returns the stored value
$value = laze::read('MY_CONSTANT');
echo $value; // Outputs the same value as before

interface Configurable {
    public function configure(array $settings): void;
}

class AppConfig implements Configurable {
    private array $settings;

    public function configure(array $settings): void {
        $this->settings = $settings;
    }

    public function getSetting(string $key) {
        return $this->settings[$key] ?? null;
    }
}

// 1. Add a constraint to ensure a value implements the Configurable interface
laze::constraint(
    name: 'Must implement Configurable interface',
    fn($key, $value) => $key == 'APP_CONFIG' ? $value instanceof Configurable : true
);

// 2. Define a lazy value that returns a closure
laze::define('MY_FUNCTION', function() {
    return function() {
        return "Function Result";
    };
});

// 3. Define a lazy value with an object instance
laze::define('APP_CONFIG', function() {
    $config = new AppConfig();
    $config->configure([
        'timezone' => 'UTC',
        'locale' => 'en_US'
    ]);
    return $config;
});

// 4. Reuse define and read within each other
laze::define('FINAL_MESSAGE', function() {
    $config = laze::read('APP_CONFIG');
    $timezone = $config->getSetting('timezone');
    return laze::read('MY_FUNCTION')() . " in timezone $timezone";
});

$finalMessage = laze::read('FINAL_MESSAGE');
echo $finalMessage; // Outputs: "Function Result in timezone UTC"

// 5. PHPUnit Test - Redefining a value
class LazeTest extends \PHPUnit\Framework\TestCase {
    public function testAppConfigCanBeMocked() {

        // mock function
        laze::define('MY_FUNCTION', function() {
            return function() {
                return "Mocked Result";
            };
        });

        // mock object
        laze::define('APP_CONFIG', function() {
            $mockConfig = $this->createMock(Configurable::class);
            $mockConfig->method('getSetting')->willReturn('mocked_timezone');
            return $mockConfig;
        });

        $message = laze::read('FINAL_MESSAGE');
        $this->assertEquals("Mocked Result in timezone mocked_timezone", $message);
    }
}

    class LazeTest extends \PHPUnit\Framework\TestCase {

        public $lazeBackup;

        public function setUp(): void {
            parent::setUp();
            $reflection = new ReflectionClass(laze::class);
            $property = $reflection->getProperty('store');
            $property->setAccessible(true);
            $this->lazeBackup = $property->getValue();
        }

        public function tearDown(): void {
            $reflection = new ReflectionClass(laze::class);
            $property = $reflection->getProperty('store');
            $property->setAccessible(true);
            $property->setValue($this->lazeBackup);
            parent::tearDown();
        }
    }