I have a PHP form. The form works but I'm trying to test to see if a value other than the first item has been selected. I can't figure out how to write the If statement.

$products = array(
 '' => 1,
 'Item 2' => 2,
 'Item 3' => 3,
 'Item 4' => 4,
 'Item 5' => 5,
 'Item 6' => 6
);

$html = generateSelect('products', $products);

function generateSelect($name = '', $options = array()) {
 $html = '<select name="'.$name.'">';
 foreach ($options as $option => $value) {
  $html .= '<option value='.$value.'>'.$option.'</option>';
 }
 $html .= '</select>';
 return $html;
}

In my table, the drop down box is displayed:

<tr>
<td style="width:{$left_col_width}; text-align:left; vertical-align:center; padding:{$cell_padding}; font-weight:bold; {$product[3]}">{$product[0]}</td>
<td style="text-align:left; vertical-align:top; padding:{$cell_padding};"><select name="{$product[1]}">
 <option value="1"></option>
 <option value="2">Item 2</option>
 <option value="3">Item 3</option>
 <option value="4">Item 4</option>
 <option value="5">Item 5</option>
 <option value="6">Item 6</option>
</select></td>
</tr>

I use the following if statement to check to see if someone has entered a phone number. if they have not entered a phone number, then the "Phone:" text turns red. How do I do an if statement similar to this to verify that someone has selected a product option from the drop down box?

  if(!empty($_POST['phone'])) {
   $phone[2] = clean_var($_POST['phone']);
   if (function_exists('htmlspecialchars')) $phone[2] = htmlspecialchars($phone[2], ENT_QUOTES);
  }
  else {
    $error = 1;
    $phone[3] = 'color:#d20128;';
  } 

it seems simple but I can't figure it out.