How can PHP developers protect their API against unauthorized access?

To protect their API against unauthorized access, PHP developers can implement API key authentication. This involves generating a unique API key for each client that needs access to the API and requiring this key to be included in each request. This way, only clients with a valid API key can access the API. 

// Check if API key is included in the request headers
if(!isset($_SERVER['HTTP_API_KEY']) || $_SERVER['HTTP_API_KEY'] !== 'your_api_key_here'){
    http_response_code(401);
    echo json_encode(array('error' => 'Unauthorized access'));
    exit;
}

Keywords

API security authentication authorization JWT HMAC

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