Bug #79517 [NEW]: Cannot specify "void" as return type of arrow function

From: pinkumohikan+phpbugs at gmail dot com Operating system: macOS Mojave PHP version: 7.4.5 Package: Unknown/Other Function Bug Type: Bug Bug description:Cannot specify "void" as return type of arrow function Description: ------------ When 'void' is specified as return type of arrow function, fatal error will be caused. Even if it returns void, it will not be fatal error if the return type is not specified. Test script: --------------- function returnVoid(): void { } var_dump(array_map(fn (int $n) => returnVoid(), [1, 2, 3])); var_dump(array_map(fn (int $n): void => returnVoid(), [1, 2, 3])); Expected result: ---------------- array(3) { [0]=> NULL [1]=> NULL [2]=> NULL } array(3) { [0]=> NULL [1]=> NULL [2]=> NULL } Actual result: -------------- array(3) { [0]=> NULL [1]=> NULL [2]=> NULL } PHP Fatal error: A void function must not return a value in php shell code on line 1 -- Edit bug report at https://bugs.php.net/bug.php?id=79517&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79517&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79517&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79517&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79517&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79517&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79517&r=support Expected behavior: https://bugs.php.net/fix.php?id=79517&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79517&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79517&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79517&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79517&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79517&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79517&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79517&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79517&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79517&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79517&r=mysqlcfg