Wordpress 4.7 call_user_func_array()
As @Afzal mentioned this line is problematic:
add_action('plugins_loaded', $this->plugin_update());We can replicate the error you got with this simple example:
class Test{ public function init() { add_action( 'plugins_loaded', $this->plugin_update() ); } public function plugin_update() { }}$obj = new Test;$obj->init(); The usual way around this problem is to replace:
add_action( 'plugins_loaded', $this->plugin_update() );with:
add_action( 'plugins_loaded', array( $this, 'plugin_update' ) );