Call XMLRPC method supervisor.getAllProcessInfo without php-xmlrpc installed via unix socket

unix_socket_xml_rpc_supervisor_getAllProcessInfo.php

<?php

    function getSupervisorAllProcessInfo(): string
    {
        $xml = '"<?xml version="1.0" encoding="utf-8"?>' .
            '<methodCall><methodName>supervisor.getAllProcessInfo</methodName><params/></methodCall>"';

        $req = "POST /RPC2 HTTP/1.0\r\nContent-Type: text/xml\r\nContent-Length: " . strlen($xml) . "\r\n\r\n$xml";

        $s = stream_socket_client('unix:///var/run/supervisor.sock', $errNo, $errStr);

        if (! $s) {
            $this->logError("Could not connect to unix:///var/run/supervisor.sock($errNo) : $errStr");
            return [];
        }

        fwrite($s, $req . "\r\n");
        $rawResult = fread($s, 102400);
        $result = simplexml_load_string(strstr($rawResult, '<?xml'));

        return (string) $result;
    }