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<?php
		//  form-validation
		$config = array(
			//  正确写法
			array(
				'field' => 'username',
				'label' => 'Username',
				'rules' => 'required|is_unique[user.username]',
				'errors' => array(
					'is_unique' => 'The user name has been taken.'
				)
			),
			//  错误写法
			array(
				'field' => 'username',
				'label' => 'Username',
				'rules' => 'required | is_unique[user.username]', //要求真是严格, 根本不知道在这里出错
				'errors' => array(
					'is_unique' => 'The user name has been taken.'
				)
			)
		);
		
		$this->form_validation->set_rules($config);