you can create a new role and set the manage-posts to it so he could approve/reject posts
then you can remove menu features as you like with this function:
function remove_menus () {
global $menu;
$user = wp_get_current_user();
if ($user->ID == 2) { // change user ID,
$restricted = array(__('Dashboard'), __('Posts'), __('Media'), __('Links'), __('Pages'), __('Appearance'), __('Tools'), __('Users'), __('Settings'), __('Comments'), __('Plugins'));
end ($menu);
while (prev($menu)){
$value = explode(' ',$menu[key($menu)][0]);
if(in_array($value[0] != NULL?$value[0]:"" , $restricted)){unset($menu[key($menu)]);}
}
}
}
add_action('admin_menu', 'remove_menus');
and for him to receive email notification on new registered user you can overwrite the wp_new_user_notification()
function:
if ( !function_exists('wp_new_user_notification') ) {
function wp_new_user_notification($user_id, $plaintext_pass = '') {
$user = new WP_User($user_id);
$user_login = stripslashes($user->user_login);
$user_email = stripslashes($user->user_email);
// The blogname option is escaped with esc_html on the way into the database in sanitize_option
// we want to reverse this for the plain text arena of emails.
$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
$message = sprintf(__('New user registration on your blog %s:'), $blogname) . "\r\n\r\n";
$message .= sprintf(__('Username: %s'), $user_login) . "\r\n\r\n";
$message .= sprintf(__('E-mail: %s'), $user_email) . "\r\n";
//email admin
@wp_mail(get_option('admin_email'), sprintf(__('[%s] New User Registration'), $blogname), $message);
//email new editor
@wp_mail('USER_EMAIL_HERE', sprintf(__('[%s] New User Registration'), $blogname), $message);
if ( empty($plaintext_pass) )
return;
$message = sprintf(__('Username: %s'), $user_login) . "\r\n";
$message .= sprintf(__('Password: %s'), $plaintext_pass) . "\r\n";
$message .= wp_login_url() . "\r\n";
wp_mail($user_email, sprintf(__('[%s] Your username and password'), $blogname), $message);
}
}
change USER_EMAIL_HERE to his email