What are some recommended frameworks for testing PHP code, and how do they compare to each other in terms of usability and effectiveness?

When testing PHP code, some recommended frameworks include PHPUnit, Codeception, and Behat. PHPUnit is the most widely used and provides a comprehensive set of testing tools for unit testing. Codeception is a higher-level testing framework that can handle acceptance, functional, and unit testing. Behat is a behavior-driven development (BDD) framework that focuses on testing the behavior of an application from the end user's perspective.

// Example of using PHPUnit for unit testing in PHP

// Include the PHPUnit framework
require_once 'path/to/vendor/autoload.php';

// Create a test case class
class MyTestCase extends PHPUnit\Framework\TestCase {
    // Define test methods
    public function testAddition() {
        $result = 1 + 2;
        $this->assertEquals(3, $result);
    }
}

// Run the test case
PHPUnit\TextUI\Command::main();