Re: Type of form element

On 29 Oct 2005, at 20:59, Richard Lynch wrote:

So you will most likely be using isset($_POST['checkbox_name']) rather than testing for "on"

I classify using isset for checking for the existence of array keys to be a bad habit as in some common cases it will not work as you expect, for example: <input type="checkbox" name="checkbox_name" /> (note it has no value attribute) If it's checked, you would get the equivalent URL of "...?checkbox_name=", so $_REQUEST['checkbox_name'] exists, but may contain NULL, and isset would return false even though it's there. A completely reliable check that will never generate any warnings is: array_key_exists('checkbox_name', $_REQUEST). If you have several checkboxes in an array (using names like name="checkbox_name[option1]"), you would say: if (array_key_exists('checkbox_name', $_REQUEST) and is_array($_REQUEST['checkbox_name'])) {

    if (array_key_exists('option1', $_REQUEST['checkbox_name'])) {
        echo "you selected option 1\n";
    }
    if (array_key_exists('option2', $_REQUEST['checkbox_name'])) {
        echo "you selected option 2\n";
    }
    //etc...

} Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture marcus@synchromedia.co.uk | http://www.synchromedia.co.uk