How to use the post data in the validation rules?

This code does not work:



$this->temp_validate = array();//global var for validation

function hard_validation($str, $param)

{

    list($table, $field) = explode('.', $param);

   

    if ( ...... hard validation $post_array['field1'], $post_array['field2'], $post_array['field3'], $post_array['field4'] .....) {

	    ......

	    return true;

    }

    else {

	    $this->form_validation->set_message('hard_validation', 'My Error Message');

	    return false;

    }

}

function callback_validation_slug($post_array, $primary_key) {

   

    //save post in global va

    if (isset($primary_key)) {

	    $this->temp_validate["id"] = $primary_key;

    }

    else {

	    if (isset($post_array['id'])) {

	    $this->temp_validate["id"] = $post_array['id'];

	    }

	    else {

		    // insert object, id not set

	    }

    }

    $this->temp_validate["field1"] = $post_array['field1'];

    $this->temp_validate["field2"] = $post_array['field2'];

    $this->temp_validate["field3"] = $post_array['field3'];

    $this->temp_validate["field4"] = $post_array['field4'];

    return $post_array;

}

function my_table()

{

    $table = __FUNCTION__;

    $this->crud->set_table($table);

    ....

    $this->crud->set_rules("slug","MyFieldName","required|slug|min_length[3]|callback_hard_validation[$table.slug]");

    $this->crud->callback_before_update(array($this, "callback_validation_slug"));

    $this->crud->callback_before_insert(array($this, "callback_validation_slug"));

    .....

}

What to do?
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How to use the post data in the validation rules?

shum