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Warning, this is NOT safe way!

First, Make sure that your php is NOT running under safe_mode (check your php.ini)

useradd.php
<?php /* * Filename: useradd.php * # this script can add linux user through php, BUT this is NOT safe ! # * # http://www.upblog.net/add-linux-user-through-php/ # * Author: alex (kukathe#gmail.com) * Date: 2008-05-07 */ error_reporting(E_ALL); $user = array(   'username'      => 'test1',   'password'      => '123456', );       echo "<pre>"; print_r($user); echo "</pre>"; echo "<h3> Exec Command </h3>"; $command = '/usr/bin/sudo /usr/sbin/useradd -g testgroup -p `openssl passwd -1 -salt "12345678" '.$user['password'].'` -s /bin/bash -m '.$user['username']; echo "<p>".$command."</p>"; echo shell_exec($command);