Question

I want to validate a form using PHP. Below is the sample of my form:

<form>
    <select name="select_box">
        <option value="0">Please Select</option>
        <option value="1">OPT 1</option>
        <option value="2">OPT 2</option>
    </select>
    <input type="submit" value="Go!" />
</form>

Answer 1

<?php 
if(isset($_REQUEST['select_box']) && $_REQUEST['select_box'] == '0') { 
  echo 'Please select a country.'; 
} 
?>