note 77845 added to function.empty

There's a faster and easier to write method than (isset($a) && strlen($a)) -- isset($a{0}). It evaluates to false if $a is not set or if it has zero length (ie. it's first character is not set). My tests indicate that it's about 33% faster. ---- Server IP: 209.41.74.194 Probable Submitter: 71.87.92.92 ---- Manual Page -- http://www.php.net/manual/en/function.empty.php Edit -- https://master.php.net/note/edit/77845 Del: integrated -- https://master.php.net/note/delete/77845/integrated Del: useless -- https://master.php.net/note/delete/77845/useless Del: bad code -- https://master.php.net/note/delete/77845/bad+code Del: spam -- https://master.php.net/note/delete/77845/spam Del: non-english -- https://master.php.net/note/delete/77845/non-english Del: in docs -- https://master.php.net/note/delete/77845/in+docs Del: other reasons-- https://master.php.net/note/delete/77845 Reject -- https://master.php.net/note/reject/77845 Search -- https://master.php.net/manage/user-notes.php