note 105690 added to function.echo

Why does this happen on my test PHP snippet? <?php echo 0500; ?> Output is 0320 Can you tell me why I echo one number without quotes, and I get returned of a different number? ---- Server IP: 208.69.120.55 Probable Submitter: 68.89.244.223 ---- Manual Page -- http://www.php.net/manual/en/function.echo.php Edit -- https://master.php.net/note/edit/105690 Del: integrated -- https://master.php.net/note/delete/105690/integrated Del: useless -- https://master.php.net/note/delete/105690/useless Del: bad code -- https://master.php.net/note/delete/105690/bad+code Del: spam -- https://master.php.net/note/delete/105690/spam Del: non-english -- https://master.php.net/note/delete/105690/non-english Del: in docs -- https://master.php.net/note/delete/105690/in+docs Del: other reasons-- https://master.php.net/note/delete/105690 Reject -- https://master.php.net/note/reject/105690 Search -- https://master.php.net/manage/user-notes.php