Bug #78513 [NEW]: compact('0') (any int) will generate an array with inaccessible key

From: tandre Operating system: Linux/Any PHP version: Irrelevant Package: Arrays related Bug Type: Bug Bug description:compact('0') (any int) will generate an array with inaccessible key Description: ------------ compact('0') (or any other number) will generate an array with inaccessible keys if a variable with that value is defined. I can't think of any reason to actually do this in real code, but I'd also expect all functions to return arrays with accessible keys. Note that ext/opcache/Optimizer/zend_func_info.c may need to be changed depending on how this is fixed, to add MAY_BE_ARRAY_KEY_LONG. F1("compact", MAY_BE_NULL | MAY_BE_ARRAY | MAY_BE_ARRAY_KEY_STRING | MAY_BE_ARRAY_OF_REF | MAY_BE_ARRAY_OF_ANY), I'd suggest limiting the fix to development php versions(php 7.4/8.0). https://bugs.php.net/bug.php?id=61655 was a similar issue with inaccessible array keys, but had a different cause (casting object to array) Test script: --------------- <?php call_user_func(function () { ${0} = 'value'; $result = compact('0'); var_export($result); var_export($result[0]); }); Expected result: ---------------- Should emit the following output, with an integer array key (0, not '0') that can be accessed. array( 0 => 'value' )'value' Alternatively, it could throw/return an error value. Actual result: -------------- php test.php array ( '0' => 'value', )Notice: Undefined offset: 0 in /home/tyson/test.php on line 6 NULL -- Edit bug report at https://bugs.php.net/bug.php?id=78513&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78513&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78513&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78513&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78513&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78513&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78513&r=support Expected behavior: https://bugs.php.net/fix.php?id=78513&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78513&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78513&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78513&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78513&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78513&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78513&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78513&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78513&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78513&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78513&r=mysqlcfg