Bug #77461 [NEW]: perfomance slowdown

From: legale dot legale at gmail dot com Operating system: linux PHP version: 7.3.1 Package: mbstring related Bug Type: Bug Bug description:perfomance slowdown Description: ------------ There is a problem with mbfl library functions. UTF-16, UTF-16BE, UTF-16LE encodings are parsed by the slow path (variable width multibyte encodings). Test script: --------------- <?php function bmark() { $args = func_get_args(); $len = count($args); if ($len < 3) { trigger_error("At least 3 args expected. Only $len given.", 256); return false; } $cnt = array_shift($args); $fun = array_shift($args); $start = microtime(true); $i = 0; while ($i < $cnt) { $i++; $res = call_user_func_array($fun, $args); } $end = microtime(true) - $start; return $end; } $i = 1000; $str32 = mb_convert_encoding(str_repeat("строка", $i), "UTF-32", "UTF-8"); $str16 = mb_convert_encoding(str_repeat("строка", $i), "UTF-16", "UTF-8"); echo "str16: " . bmark($i, "mb_substr", $str16, 0, null, "UTF-16") . PHP_EOL; echo "str32: " . bmark($i, "mb_substr", $str32, 0, null, "UTF-32") . PHP_EOL; ?> Expected result: ---------------- UTF-16 and UTF-32 parsing speed should be mostly the same. Actual result: -------------- str16: 0.13957190513611 str32: 0.026632070541382 -- Edit bug report at https://bugs.php.net/bug.php?id=77461&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77461&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77461&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77461&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77461&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77461&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77461&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77461&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77461&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77461&r=support Expected behavior: https://bugs.php.net/fix.php?id=77461&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77461&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77461&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77461&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77461&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77461&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77461&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77461&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77461&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77461&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77461&r=mysqlcfg