php - checkbox group don't work - codeigniter -

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i'm using codeigniter , need work checkbox group. in view:

<fieldset>     <input type="checkbox" id="country" name="country[]" value="cat" />cats <br />     <input type="checkbox" id="country" name="country[]" value="dog" />dogs<br /> </fieldset>

in controller:

foreach ($this->input->post('country') $country) {     echo $country; };

when i'm check or not check - echo "";

try this

<fieldset>     <input type="checkbox" id="country" name="country" value="cat" />cats <br />     <input type="checkbox" id="country" name="country" value="dog" />dogs<br />     </fieldset>

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