#31357 [NEW]: PHP gives indulgences when a developer uses wrong escaping

From: wicked at ngs dot ru Operating system: Win XP + SP1 PHP version: 4.3.8 PHP Bug Type: Scripting Engine problem Bug description: PHP gives indulgences when a developer uses wrong escaping Description: ------------ I expect that print "\a"; will fail because there is no entity like \a among \n, \r, \t, \\, \$, \", \[0-7]{1,3} and \x[0-9A-Fa-f]{1,2}. It is like that browsers like IE shows "&abc" as there were written "&amp;abc". It's harmful. More than that, I and some other PHP experts have been puzzleing why this string works: $tokens = preg_split('/(?<!\\\)[&?!]/', $query, -1, PREG_SPLIT_DELIM_CAPTURE); Everybody expected that ) was escaped! Reproduce code: --------------- $tokens = preg_split('/(?<!\\\)[&?!]/', $query, -1, PREG_SPLIT_DELIM_CAPTURE); Expected result: ---------------- PHP fails because of brackets mismatch (one of brackets is escaped). Actual result: -------------- It works :( -- Edit bug report at http://bugs.php.net/?id=31357&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=31357&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=31357&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=31357&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=31357&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=31357&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=31357&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=31357&r=needscript Try newer version: http://bugs.php.net/fix.php?id=31357&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=31357&r=support Expected behavior: http://bugs.php.net/fix.php?id=31357&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=31357&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=31357&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=31357&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=31357&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=31357&r=dst IIS Stability: http://bugs.php.net/fix.php?id=31357&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=31357&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=31357&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=31357&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=31357&r=mysqlcfg