ErrorException: Undefined index: known

[AndyB]

I have the following code in my Register Email add-on:

					// get location
					$tags = get_meta_tags('http://www.geobytes.com/IpLocator.htm?GetLocation&template=php3.txt&IpAddress=' . $ipAddress);

					// define location only if we have data
					if ($tags['known'] == 'true')
					{
						$location = $tags['city'] . ', ' . $tags['region'] . ', ' . $tags['country'];
					}

The following line:

if ($tags['known'] == 'true')

very rarely will produce a server error message. What is the proper way to code this so in case the index is undefined, it will not produce an error message?

Thank you.

 

[Chris D]

Use isset() or empty()

 

[AndyB]

Thank you, Chris.