How can implementing interfaces in PHP help in achieving code reusability and flexibility?

Implementing interfaces in PHP helps in achieving code reusability and flexibility by allowing classes to share a common set of methods without being tightly coupled. This means that classes can be easily swapped out for one another as long as they adhere to the interface contract. This promotes a more modular and maintainable codebase. 

<?php
// Define the interface
interface Logger {
    public function log($message);
}

// Implement the interface in a class
class FileLogger implements Logger {
    public function log($message) {
        // Log message to a file
    }
}

// Implement the interface in another class
class DatabaseLogger implements Logger {
    public function log($message) {
        // Log message to a database
    }
}

// Usage example
$fileLogger = new FileLogger();
$fileLogger->log("Logging to a file");

$databaseLogger = new DatabaseLogger();
$databaseLogger->log("Logging to a database");
?>

Keywords

interfaces code reusability flexibility PHP implementation

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