Codeignitor Essential Function

// input form
<?php echo form_input('name', set_value('name', $user->name)); ?>
// input form get data
<?php echo $this->input->post('name'); ?>

// rules from validation
public $rules_admin = array(
        'email' => array(
            'field' => 'email',
            'label' => 'Email',
            'rules' => 'trim|required|valid_email|callback__unique_email|xss_clean'
            ),
        'name' => array(
            'field' => 'name',
            'label' => 'Name',
            'rules' => 'required'
            ),
        'password' => array(
            'field' => 'password',
            'label' => 'Password',
            'rules' => 'trim|required|matches[password_confirm]'),
        'password_confirm' => array(
            'field' => 'password_confirm',
            'label' => 'Password Confirm',
            'rules' => 'trim|required|matches[password]')
        );