如何使用检查CodeIgniter中的复选框？

I have checkbox which is created as below in CI:

echo form_checkbox(array(
    'name' => 'active',
    'id' => 'active',
    'value' => '1'
));

I also have other fields such as Name which have a required field validation applied. So, when I leave Name as blank and tick the active checkbox, then it shows error for name. But it removes the check on active checkbox. I want to keep the active checkbox as checked.

I know about a set_checkbox method in CI, but not sure how to use this in the above. In case of form_input we simply use set_value and all is ok. But with set_checkbox it returns full string checked="checked". So when I use the set_checkbox and form_checkbox as combined as below, then it doesn't work.

echo form_checkbox(array(
    'name' => 'active',
    'id' => 'active',
    'value' => '1',
    'checked' => set_checkbox('active', '1')
));

Any idea how to fix this?

The checked attribute on form_checkbox accepts TRUE/FALSE value. A simple comparison to see if the value is set will work.

echo form_checkbox(array(
    'name' => 'active',
    'id' => 'active',
    'value' => '1',
    'checked' => ( $this->input->post('active') == 1 )
));

The set_checkbox method was not made to be used in this style. It's intended to be use inside existing HTML as per this example from the CI User Guide

<input type="checkbox" name="mycheck" value="1" <?php echo set_checkbox('mycheck', '1'); ?> />
<input type="checkbox" name="mycheck" value="2" <?php echo set_checkbox('mycheck', '2'); ?> />

You can set this as

echo form_checkbox(array(
    'name' => 'active',
    'id' => 'active',
    'value' => '1',
    'checked' => ($this->input->post('active') && $this->input->post('active') == 1 )
));

IF you Do not use ($this->input->post('active') && ....) in your condition it will throw an error if you do not check this check-box and submit the form.