Create new Magento admin user programmatically. Edit and add the php file below to the root of your Magento folder. Run it in the browser and the user will be created.

create_admin_user.php

<?php
# Create new Magento admin user programmatically.
require_once('./app/Mage.php');
umask(0);
Mage::app();

try {
$user = Mage::getModel('admin/user')
->setData(array(
'username'  => 'admin1',
'firstname' => 'Admin',
'lastname'    => 'Admin',
'email'     => '[email protected]',
'password'  => 'admin123',
'is_active' => 1
))->save();

} catch (Exception $e) {
echo $e->getMessage();
exit;
}

//Assign Role Id
try {
$user->setRoleIds(array(1))  //Administrator role id is 1 ,Here you can assign other roles ids
->setRoleUserId($user->getUserId())
->saveRelations();

} catch (Exception $e) {
echo $e->getMessage();
exit;
}

echo "User created successfully";

?>