note 47396 added to function.isset

Using isset($array['key']) is useful, but be careful! using isset($array['key']['subkey']) doesn't work as one could expect, if $array['key'] is a string it seems that 'subkey' is converted to (integer) 0 and $array['key']['subkey'] is evaluated as the first char of the string. The solution is to use is_array($array['key']) && isset($array['key']['subkey']) Here is a small code to show this: <?php $ex = array('one' => 'val1','two' => 'val2'); echo '$ex = ';print_r($ex); echo "<br />"; echo " isset(\$ex['one']['three']) : "; if (isset($ex['one']['three'])) echo 'true'; else echo 'false'; echo "<br />"; echo "is_array(\$ex['one']) && isset(\$ex['one']['three']) : "; if (is_array($ex['one']) && isset($ex['one']['three'])) echo 'true'; else echo 'false'; ?> shows: $ex = Array ( [one] => val1 [two] => val2 ) isset($ex['one']['three']) : true is_array($ex['one']) && isset($ex['one']['three']) : false ---- Manual Page -- http://www.php.net/manual/en/function.isset.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47396 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47396&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47396&report=yes Search -- http://master.php.net/manage/user-notes.php