Set all radio buttons to either true or false in osCommerce, or just the one as true?

I added some radio buttons to a PHP form in osCommerce. I plan on开发者_如何学运维 adding a bunch more but in the meantime I have four right now. I'm wondering if I need to set all the radio buttons as true/false or just the single instance I want as true.

Here's the code I have:

if (!isset($pInfo->tab_id)) $pInfo->tab_id = '1';

switch ($pInfo->tab_id) {
  case '0': $none_tab_id = true; $shirt_tab_id = false; 
            $coverall_tab_id = false; $glove_tab_id = false; 
            break;
  case '1': $coverall_tab_id = true; $shirt_tab_id = false; 
            $none_tab_id = false; $glove_tab_id = false; 
            break;
  case '2': $coverall_tab_id = false; $shirt_tab_id = true; 
            $none_tab_id = false; $glove_tab_id = false; 
            break;
  case '3': $glove_tab_id = true; $coverall_tab_id = false; 
            $shirt_tab_id = false; $none_tab_id = false; 
            break;
   default: $coverall_tab_id = false; $shirt_tab_id = true; 
            $none_tab_id = false;
}     

.

<?php 

echo '&nbsp;None' . tep_draw_radio_field('tab_id', '0', $none_tab_id) . 
     '&nbsp;coveralls' . tep_draw_radio_field('tab_id', '1', $coverall_tab_id) .
     '&nbsp;Shirts' .tep_draw_radio_field('tab_id', '2', $shirt_tab_id) . 
     '&nbsp;Gloves' . tep_draw_radio_field('tab_id', '3', $glove_tab_id); 

?>

osCommerce defines the tep_draw_radio_field function as this:

tep_draw_radio_field($name, $value = '', $checked = false, $compare = '')

Is it necessary to set all the variables to false in each case or if can I just set the one I want to true?

In the tep_draw_radio_field() function the only required parameter is the name variable, of which the radio button will use.

The rest of the arguments are optional and have defaults already set for them.

You don't need to code all of the radio buttons to either true or false. The default argument is false and any that aren't explicitly set when you call the function will be set as such.

Just set the one you need to be true as true. When you do, make doubly sure that it's also the third argument.

Why not just do something like this?

if (!isset($pInfo->tab_id)) $pInfo->tab_id = '1';

$none_tab_id = ($pInfo->tab_id == '0');
$coverall_tab_id = ($pInfo->tab_id == '1');
$shirt_tab_id = ($pInfo->tab_id == '2');
$glove_tab_id = ($pInfo->tab_id == '3');

if(!($none_tab_id || $coverall_tab_id || $glove_tab_id || $shirt_tab_id)) {
    $shirt_tab_id = true;
}

You could tighten up the switch statement:

$none_tab_id = false; 
$shirt_tab_id = false;                 
$coverall_tab_id = false; 
$glove_tab_id = false; 
switch ($pInfo->tab_id) {
  case '0': $none_tab_id = true; 
            break;
  case '1': $coverall_tab_id = true; 
            break;
  case '2': $shirt_tab_id = true; 
            break;
  case '3': $glove_tab_id = true;  
            break;
   default: $shirt_tab_id = true; 

}   

You don't need to code all of the radio buttons to either true or false. The default argument is false and any that aren't explicitly set when you call the function will be set as such.

Just set the one you need to be true as true. When you do, make doubly sure that it's also the third argument.