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<?php

function redirect_user_on_role()
{
	//retrieve current user info 
	global $current_user;
     	get_currentuserinfo();
 	//If login user role is Subscriber
     	if ($current_user->user_level == 0)
     	{
        	wp_redirect( home_url() ); exit;
     	}
 	//If login user role is Contributor
 	else if ($current_user->user_level > 1)
 	{
        	 wp_redirect( home_url() ); exit;
     	}
  	//If login user role is Editor
     	else if ($current_user->user_level >8)
     	{
		wp_redirect( home_url() ); exit;
     	}
 	// For other rolse 
	else
     	{
      		$redirect_to = 'http://google.com/';
        	return $redirect_to;
 	}
}
add_action('admin_init','redirect_user_on_role');

?>