| http://www.w3.org/ns/prov#value | - The following is an example of how to test if a variable is set, whether or not it is NULL. It makes use of the fact that an unset variable will throw an E_NOTICE error, but one initialized as NULL will not. <?phpfunction var_exists($var){ if (empty($GLOBALS['var_exists_err'])) { return true; } else { unset($GLOBALS['var_exists_err']); return false; }}function var_existsHandler($errno, $errstr, $e
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