Codeigniter Passing Extra Parameters to Custom Validation Rule

According to this documentation, how can I pass second parameter to the rule method?

This is my custom rule

PHP Code:

public function email_exists($email, $exclude_id=NULL)
{
    if ( $exclude_id !== NULL ) $this->db->where_not_in('id', $exclude_id);

    $result = $this->db->select('id')->from('users')->where('email', $email)->get();

    if ( $result->num_rows() > 0 ) {
        $this->form_validation->set_message('email_exists', '{field} has been used by other user.');
        return FALSE;
    } else {
        return TRUE;
    }
} 


and this is how i call it from controller

PHP Code:

$rules = [
    [
        'field' => 'email',
        'label' => 'Email',
        'rules' => [
            'required',
            'trim',
            'valid_email',
            'xss_clean',
            ['email_exists', [$this->m_user, 'email_exists']]
        ]
    ]
];

$this->form_validation->set_rules($rules); 


How can I pass second parameter to email_exists method?

Maybe something like this:

PHP Code:

$second_param = 'whatever';

$rules = [
    [
        'field' => 'email',
        'label' => 'Email',
        'rules' => [
            'required',
            'trim',
            'valid_email',
            'xss_clean',
            [
                'email_exists', 
                function( $str ) use ( $second_param ){
                    return $this->m_user->email_exists( $str, $second_param ); 
                }
            ]
        ]
    ]
]; 


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Community Auth For CodeIgniter 3

Maybe something like this:

PHP Code:

$second_param = 'whatever';

$rules = [
    [
        'field' => 'email',
        'label' => 'Email',
        'rules' => [
            'required',
            'trim',
            'valid_email',
            'xss_clean',
            [
                'email_exists', 
                function( $str ) use ( $second_param ){
                    return $this->m_user->email_exists( $str, $second_param ); 
                }
            ]
        ]
    ]
]; 


It works. Thanks a lot sir.