note 90245 added to language.types.array

Responding to genix at arctoz dot de, bear in mind that isset() returns FALSE if an array element has been explicitly assigned NULL. In most cases this is not a problem, however if you do at some point need to make a distinction between NULL and unset array elements you should use array_key_exists() instead of isset(). <?php $array = Array('foo' => null); // Outputs 'Foo does not exist' because $array['foo'] is NULL if (isset($array['foo'])) echo 'Foo exists'; else 'Foo does not exist'; // Outputs 'Foo exists' ...because it does if (array_key_exists($array, 'foo')) echo 'Foo exists'; else 'Foo does not exist'; ?> ---- Server IP: 69.147.83.197 Probable Submitter: 76.2.25.104 ---- Manual Page -- http://www.php.net/manual/en/language.types.array.php Edit -- https://master.php.net/note/edit/90245 Del: integrated -- https://master.php.net/note/delete/90245/integrated Del: useless -- https://master.php.net/note/delete/90245/useless Del: bad code -- https://master.php.net/note/delete/90245/bad+code Del: spam -- https://master.php.net/note/delete/90245/spam Del: non-english -- https://master.php.net/note/delete/90245/non-english Del: in docs -- https://master.php.net/note/delete/90245/in+docs Del: other reasons-- https://master.php.net/note/delete/90245 Reject -- https://master.php.net/note/reject/90245 Search -- https://master.php.net/manage/user-notes.php