note 124691 added to function.preg-match

After the breaking change in 7.4, be aware that count( $matches ) may be different, depending on PREG_UNMATCHED_AS_NULL flag. With PREG_UNMATCHED_AS_NULL, count( $matches ) will always be the maximum number of subpatterns. However, without PREG_UNMATCHED_AS_NULL the $matches array will omit any unmatched subpatterns at the tail end. Result forthe first two out of three matches with PREG_OFFSET_CAPTURE flag only: array (size=3) 0 => array (size=2) 0 => string 'may/02' (length=6) 1 => int 0 1 => array (size=2) 0 => string 'may' (length=3) 1 => int 0 2 => array (size=2) 0 => string '02' (length=2) 1 => int 4 Result for two out of three matches with additional PREG_UNMATCHED_AS_NULL flags: array (size=4) 0 => array (size=2) 0 => string 'may/02' (length=6) 1 => int 0 1 => array (size=2) 0 => string 'may' (length=3) 1 => int 0 2 => array (size=2) 0 => string '02' (length=2) 1 => int 4 3 => array (size=2) 0 => null 1 => int -1 ---- Server IP: 45.112.84.4 Probable Submitter: 38.142.137.34 (proxied: 173.63.128.218) ---- Manual Page -- http://php.net/manual/en/function.preg-match.php Edit -- https://master.php.net/note/edit/124691 Del: integrated -- https://master.php.net/note/delete/124691/integrated Del: useless -- https://master.php.net/note/delete/124691/useless Del: bad code -- https://master.php.net/note/delete/124691/bad+code Del: spam -- https://master.php.net/note/delete/124691/spam Del: non-english -- https://master.php.net/note/delete/124691/non-english Del: in docs -- https://master.php.net/note/delete/124691/in+docs Del: other reasons-- https://master.php.net/note/delete/124691 Reject -- https://master.php.net/note/reject/124691 Search -- https://master.php.net/manage/user-notes.php