[stupalov]

Since v3.19.2 (cbc1cb3, part of #721), Dispatcher::execute() passes every string callback to parseStringClassAndMethod(), so a route or event mapped to a plain global function name no longer works:

function hello($name) { echo "hello $name"; }

Flight::route('/hello/@name', 'hello');
// InvalidArgumentException: Invalid string format 'hello', use 'ClassName::method' or 'ClassName->method'.

verifyValidFunction() still lists 'existingFunction' as a valid callable, and up to v3.19.1 execute() only parsed strings containing -> or ::, so this looks like an unintended regression. We hit it on upgrade: our whole API registers routes by function name.

The fix calls an existing function name directly and leaves Class->method / Class::method strings on the existing parse path, so Class::nonStaticMethod is still instantiated as before, including on PHP 7.4 where is_callable() would accept it as a static call.

Added DispatcherTest::testExecuteGlobalFunctionString; it fails on v3.19.4 with the exception above.

Checked locally: phpunit on PHP 7.4.33 and 8.5.10 (501 tests), phpcs clean on the changed files, phpstan reports the same errors as on v3.19.4 (nothing new). I did not run composer test-server.

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