Re: [PHP] getting around the undefined index

On 11/27/06, Ross <ross@xxxxxxxxxxxxx> wrote:

I have not found a satisfactory way of doing this yet!!!!


$text = $_REQUEST['text_size'];
if ($text) {
echo $text;
}


I send the $text_size variable to the browser with lines like...

<a href="<? $_SERVER['PHP_SELF']; ?>?text_size=small" class="size1"
id="one">A</a>


When the page initially loads I get a undefined index error as it does not
exist but is there a way of wrapping in in a switch statement or funtion so
the variable is only used when $_REQUEST['text_size']; actually exists.


Ross

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Try this:

$text = (isset($_REQUEST['text_size']))
? preg_replace("/\W/", "", $_REQUEST['text_size'])
: 'your-default-value';

This will say $text equals a cleaned version of
$_REQUEST['text_size'] if it exists. If it does not exist then use
'your-default-value'.

If you use any data from external resources always remember to
sanitize the data. Otherwise you will end up with XSS vulnerabilities
in your scripts. This is _very_ important.
.

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