Bug #73947 [NEW]: preg_match() behavior change

From: thekid@php.net Operating system: Windows PHP version: master-Git-2017-01-16 (snap) Package: PCRE related Bug Type: Bug Bug description:preg_match() behavior change Description: ------------ Optional patterns, if not matched, seem to return NULL instead of empty strings in certain situations. Test script: --------------- var_dump([preg_match("!([a-z]+)://([^@]+@)?([a-z]+)!", "http://domain", $matches), $matches]); Expected result: ---------------- array(2) { [0]=> int(1) [1]=> array(4) { [0]=> string(13) "http://domain" [1]=> string(4) "http" [2]=> string(0) "" [3]=> string(6) "domain" } } Actual result: -------------- array(2) { [0]=> int(1) [1]=> array(4) { [0]=> string(13) "http://domain" [1]=> string(4) "http" [2]=> NULL [3]=> string(6) "domain" } } -- Edit bug report at https://bugs.php.net/bug.php?id=73947&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73947&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73947&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73947&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73947&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73947&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73947&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73947&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73947&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73947&r=support Expected behavior: https://bugs.php.net/fix.php?id=73947&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73947&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73947&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73947&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73947&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73947&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73947&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73947&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73947&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73947&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73947&r=mysqlcfg