create an ssh class for multiplexing ssh connections and running commands on them in a queue.

<?php

    class SSH {
        private $conn;
        private $host;
        private $port;
        private $username;
        private $password;
        private $commands;

        public function __construct($host, $port, $username, $password) {
            $this->conn = ssh2_connect($host, $port);
            $this->host = $host;
            $this->port = $port;
            $this->username = $username;
            $this->password = $password;
            $this->commands = [];
        }

        public function addCommand($command) {
            $this->commands[] = $command;
        }

        public function execute() {
            array_unshift($this->commands, 'export TERM=xterm;');
            $command = implode('', $this->commands);
            return ssh2_exec($this->conn, $command);
        }
    }

    $ssh = new SSH('192.168.1.1', 22, 'root', 'password');