What are some best practices for integrating multiple domain checkers into a single PHP script?

When integrating multiple domain checkers into a single PHP script, it is important to organize the code in a modular and maintainable way. One approach is to create separate classes or functions for each domain checker, allowing for easy addition or removal of checkers. Additionally, using interfaces or abstract classes can help standardize the implementation of different checkers. Finally, consider using a configuration file or array to store the list of domain checkers and dynamically instantiate them as needed.

interface DomainChecker {
    public function checkDomain($domain);
}

class DomainChecker1 implements DomainChecker {
    public function checkDomain($domain) {
        // Implementation for domain checker 1
    }
}

class DomainChecker2 implements DomainChecker {
    public function checkDomain($domain) {
        // Implementation for domain checker 2
    }
}

$domainCheckers = [
    new DomainChecker1(),
    new DomainChecker2()
];

$domain = "example.com";

foreach ($domainCheckers as $checker) {
    $result = $checker->checkDomain($domain);
    // Handle the result accordingly
}