note 98750 added to function.preg-replace-callback

<<preg_replace_callback returns NULL when pcre.backtrack_limit is reached; this sometimes occurs faster then you might expect. No error is raised either; so don't forget to check for NULL yourself>> It is useful note for me . thank for that . It made me fool around to figure out what my coding going wrong .if backtrack reach its limit ,It wont write info out . ---- Server IP: 69.147.83.197 Probable Submitter: 202.172.41.34 ---- Manual Page -- http://www.php.net/manual/en/function.preg-replace-callback.php Edit -- https://master.php.net/note/edit/98750 Del: integrated -- https://master.php.net/note/delete/98750/integrated Del: useless -- https://master.php.net/note/delete/98750/useless Del: bad code -- https://master.php.net/note/delete/98750/bad+code Del: spam -- https://master.php.net/note/delete/98750/spam Del: non-english -- https://master.php.net/note/delete/98750/non-english Del: in docs -- https://master.php.net/note/delete/98750/in+docs Del: other reasons-- https://master.php.net/note/delete/98750 Reject -- https://master.php.net/note/reject/98750 Search -- https://master.php.net/manage/user-notes.php