WordPress: wp-cron not working and not giving error in log

This is a wp-cron I defined in function.php file, but I don’t get any result in the error log, the event is in the cron list but if I launch it nothing happens. I have define('WP_DEBUG', true); And error log enabled on all levels in php.ini

Does anybody know where am I doing wrong?

function cron_daily_whatever() {
  if (!wp_next_scheduled('check_daily_event')) {
    wp_schedule_event(time(),'daily','check_daily_event');
  }
}

function my_do_this_daily() {
    error_log('check');
}

add_action('wp','cron_daily_whatever');
add_action('check_daily_event','my_do_this_daily');

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SOLUTION I used the snippet

 file_put_contents(WP_CONTENT_DIR . '/my-debug.txt', "Response: ".$res."n", FILE_APPEND);

to debug it. And it now works.

Answer

By the default WP_DEBUG log in wp-content, you should define (‘WP_DEBUG_LOG’,TRUE); as well. Then you’ll need to clear your scheduled event(and set it again) to test today if it has already run once. See https://codex.wordpress.org/Function_Reference/wp_clear_scheduled_hook for that.