How can I output an array with logger?

You can pass in an array parameter as the second argument:

// You can also pass context parameters like this
$logger->log(
    'This is a {message}', 
    [ 
        'message' => 'parameter' 
    ]
);

https://docs.phalcon.io/latest/en/logging

Or you could json_encode your array to procude a string:

$logger->log(json_encode(['some'=>'array']));

With json_encode is OK, but How can I do that into all loggers without put it in all loggers json_encode? I mean, the parent or something like that.

You can pass in an array parameter as the second argument:

// You can also pass context parameters like this
$logger->log(
   'This is a {message}', 
   [ 
       'message' => 'parameter' 
   ]
);

https://docs.phalcon.io/latest/en/logging

Or you could json_encode your array to procude a string:

$logger->log(json_encode(['some'=>'array']));

Thank you Lajos!

You could create your own FormatterInterface

https://docs.phalcon.io/latest/en/api/Phalcon_Logger_Formatter

https://github.com/phalcon/cphalcon/blob/master/phalcon/logger/formatter/json.zep

(the last link is an example of encoding ALL fields as json, not just the context array, you would have to modify it to suit your needs)