Bug #79364 [NEW]: When copy empty array, next key is unspecified.

From: yuubiseiharukana at gmail dot com Operating system: Any PHP version: 7.4.3 Package: Arrays related Bug Type: Bug Bug description:When copy empty array, next key is unspecified. Description: ------------ Copy array. When arrays next index=2 and max key=2, next key is both 2. When arrays next index=2 and max key=1, next key is both 2. When arrays next index=2 and max key=0, next key is 0 or 2. Test script: --------------- https://3v4l.org/TYc10 $a = [1, 2]; unset($a[1], $a[0]); $b = $a; $a[] = 3; $b[] = 4; var_dump($a, $b); // $a = [0=>3] $b = [2=>4] When increase variables, only the last one take over key. Expected result: ---------------- Always same key whth $a and $b. Actual result: -------------- Same key when array is not empty. Not same key when array is empty. -- Edit bug report at https://bugs.php.net/bug.php?id=79364&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79364&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79364&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79364&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79364&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79364&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79364&r=support Expected behavior: https://bugs.php.net/fix.php?id=79364&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79364&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79364&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79364&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79364&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79364&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79364&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79364&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79364&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79364&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79364&r=mysqlcfg