Bug #80032 [NEW]: Can't use valid callback as default value for callable parameters

From: antonfedonyuk at gmail dot com Operating system: Any PHP version: 7.4.9 Package: Compile Failure Bug Type: Bug Bug description:Can't use valid callback as default value for callable parameters Description: ------------ Can't use valid callback(string or array) as default value of callable parameters. It's generate fatal error: Default value for parameters with callable type can only be NULL. The guide doesn't contain any notes on this issue. Test script: --------------- <?php function test(callable $callback = 'strtoupper') { return $callback(); } ?> -- Edit bug report at https://bugs.php.net/bug.php?id=80032&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80032&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80032&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80032&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80032&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80032&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80032&r=support Expected behavior: https://bugs.php.net/fix.php?id=80032&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80032&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80032&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80032&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80032&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80032&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80032&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80032&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80032&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80032&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80032&r=mysqlcfg