I have a PHP file about MQTT publish. When I run this PHP file in the terminal it run properly and no error everything was fine, But when I open it via a browser I get an error like this:
Warning: stream_socket_client(): unable to connect to tcp://xxx.xxx.xxx.xxx:1883 (Permission denied) in /var/www/mydomain/html/PLC-controller/phpMQTT.php on line 148
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