another.php

<?php

return array(
    'zfr_cors' => array(
        array(
            'rule' => '*',
            'allowed_origins' => array(),
            'allowed_methods' => array(),
            // ...
        ),
        
        array(
            'rule' => 'admin*',
            'allowed_origins' => array(),
            'allowed_methods' => array(),
            // ...
        )    
    )  
);

foo.php

<?php

return array(
    'zfr_cors' => array(
        'defaults' => array(
            'allowed_origins' => array(),
            'allowed_methods' => array(),
            // ...
        ),
        
        'routes' => array(
            array(
                'rule' => 'admin*',
                'allowed_origins' => array(),
                'allowed_methods' => array(),
                // ...
            )    
        )
    )  
);