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<?php

// display message ina dmin from module
$this->message('This is my message');
 
// Edit Modules Settings
$old_data = wire('modules')->getModuleConfigData('YOU_MODULE_CLASS');
$new_data = array('development_mode' => '0');
$data = array_merge($old_data, $new_data);
$module = 'YOU_MODULE_CLASS';
wire('modules')->saveModuleConfigData($module, $data);