[php-src] Issue #20188: Invalid function reference within the same namespace

Issue: https://github.com/php/php-src/issues/20188 Author: infinitum11 ### Description When an eval-defined-namespaced-function is called from within another function of that namespace, it refers to the global function instead of the locally defined function. https://3v4l.org/0PbCO ```php <?php namespace Loader { function register() { eval(<<<EOPHP namespace App; function strlen(\$str) { return 20; } EOPHP ); } } namespace App { function run($str) { echo __NAMESPACE__, PHP_EOL; echo strlen($str), PHP_EOL; } run("foo"); \Loader\register(); run("bar"); } ``` Resulted in this output: ``` App 3 App 3 ``` But I expected this output instead: ``` App 3 App 20 ``` However, if we call the strlen() function from the global scope of the namespace App, we get an expected result https://3v4l.org/mQuUI ```php <?php namespace Loader { function register() { eval(<<<EOPHP namespace App; function strlen(\$str) { return 20; } EOPHP ); } } namespace App { echo __NAMESPACE__, PHP_EOL; echo strlen("foo"), PHP_EOL; \Loader\register(); echo __NAMESPACE__, PHP_EOL; echo strlen("foo"), PHP_EOL; } ``` Resulted in this output: ``` App 3 App 20 ``` ### PHP Version ```plain 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13 ``` ### Operating System _No response_