Bug #80348 [NEW]: 10.000% inneficiency when using array_intersect_key and array_intersect_ukey

From: gilperon at gmail dot com Operating system: All PHP version: 7.4.12 Package: *General Issues Bug Type: Bug Bug description:10.000% inneficiency when using array_intersect_key and array_intersect_ukey Description: ------------ Please run the test script. In my computer it outputs this: 1-> 0.0002131462097168 2-> 0.02832914352417 It's a 10.000% difference (100 * 0.0002 / 0.02) when using 2 supposedly very similar functions, with only a small difference that one allows a callback to be used. I really need to use array_intersect_ukey but the performance hit is huge. I tried creating my own PHP implementation of array_intersect_ukey and it runs a lot faster, but still is much slower than array_intersect_key and I really need something similar to array_intersect_key in terms of speed (it can even be 10x slower, but not 100x or worse. Test script: --------------- <?php $a = array(); $b = array(); for ($i=0;$i<1000;$i++) { $a[$i] = true; $b[2*$i + 1] = true; } $z = microtime(true); for ($i=0;$i<10;$i++) { $temp = array_intersect_key($a,$b); } echo "\n 1-> " . (microtime(true) - $z); $z = microtime(true); for ($i=0;$i<10;$i++) { $temp = array_intersect_ukey($a,$b,function($key1,$key2) { if ($key1 === $key2) { return 0; } else{ return $key2 - $key1; } }); } echo "\n 2-> " . (microtime(true) - $z); ?> Expected result: ---------------- Both functions should run at similar speeds. Actual result: -------------- One function runs 10.000% slower than the other. -- Edit bug report at https://bugs.php.net/bug.php?id=80348&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80348&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80348&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80348&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80348&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80348&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80348&r=support Expected behavior: https://bugs.php.net/fix.php?id=80348&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80348&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80348&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80348&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80348&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80348&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80348&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80348&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80348&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80348&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80348&r=mysqlcfg