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Posted by Marcus Bointon on 10/30/05 13:52
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
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