Recipe 4.11 Checking if a Key Is in an Array
4.11.1 Problem
You want to know if an array contains
a certain key.
4.11.2 Solution
Use isset( ):
if (isset($array['key'])) { /* there is a value for 'key' in $array */ }
4.11.3 Discussion
You can check the definedness of an array element just as
you'd for any other variable. See the Introduction
to Chapter 5 for more information about the truth
value of variables.
4.11.4 See Also
Documentation on isset( ) at
http://www.php.net/isset.
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