Bug #78970 [NEW]: Compact can't resolve outer scoped variables using short closures

From: stanislav dot goldmann at gmail dot com Operating system: Linux/Any PHP version: 7.4.0 Package: Arrays related Bug Type: Bug Bug description:Compact can't resolve outer scoped variables using short closures Description: ------------ In the proposal of short closures (https://wiki.php.net/rfc/arrow_functions_v2) the following is stated: "When a variable used in the expression is defined in the parent scope it will be implicitly captured by-value." With this example: $y = 1; $fn1 = fn($x) => $x + $y; $fn2 = function ($x) use ($y) { return $x + $y; }; These two behave exactly the same, as expected. However compact doesn't behave that way, as it doesn't recognize a variable from outer scope until it is explicitly called. Test script: --------------- $name = 'foo'; $array = ['bar']; $failing = fn($value) => compact('name', 'value'); $working = fn($value) => compact('name', 'value') + [$name]; var_dump(array_map($failing, $array)); var_dump(array_map($working, $array)); Expected result: ---------------- Short closures using compact should resolve outer scoped variables and behave like "long" closures using an use statement. fn($value) => compact('name', 'value') should work just like function($value) use ($name) { return compact('name', 'value'); } And return the following array(1) { [0]=> array(3) { ["name"]=> string(3) "foo" ["value"]=> string(3) "bar" } } Actual result: -------------- // Notice: compact(): Undefined variable: name array(1) { [0]=> array(1) { ["value"]=> string(3) "bar" } } -- Edit bug report at https://bugs.php.net/bug.php?id=78970&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78970&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78970&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78970&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78970&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78970&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78970&r=support Expected behavior: https://bugs.php.net/fix.php?id=78970&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78970&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78970&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78970&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78970&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78970&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78970&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78970&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78970&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78970&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78970&r=mysqlcfg