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4.11. Checking if a Key Is in an Array
4.11.2. Solution
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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| 4.10. Printing an Array with Commas |  | 4.12. Checking if an Element Is in an Array |
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