[php-src] Issue #12320: Class not found when defined after use, if it contains a __toString method

Issue: https://github.com/php/php-src/issues/12320 Author: tobia ### Description The following code: ```php <?php new A(); echo "OK"; class A { public function __toString() { return "A"; } } ``` Resulted in this output: ``` Uncaught Error: Class "A" not found ``` But I expected this output instead: ``` OK ``` Here is a simple way to test multiple versions in Bash: for ver in 7.4.33 8.0.0alpha1 8.2.10 8.2.11RC1 8.3.0RC2; do echo $ver:; docker run --rm php:$ver -r 'new A; echo "OK\n"; class A { function __toString() { return "A"; } }'; echo; done Result: ``` 7.4.33: OK 8.0.0alpha1: Fatal error: Uncaught Error: Class 'A' not found in Command line code:1 Stack trace: #0 {main} thrown in Command line code on line 1 8.2.10: Fatal error: Uncaught Error: Class "A" not found in Command line code:1 Stack trace: #0 {main} thrown in Command line code on line 1 8.2.11RC1: Fatal error: Uncaught Error: Class "A" not found in Command line code:1 Stack trace: #0 {main} thrown in Command line code on line 1 8.3.0RC2: Fatal error: Uncaught Error: Class "A" not found in Command line code:1 Stack trace: #0 {main} thrown in Command line code on line 1 ``` As you can see, this bug was introduced in the 8.x branch, because all 8.x versions are affected, from the first alpha to the latest RCs, including all stable versions I tried. 7.x and earlier are unaffected. I did not test if other magic methods have the same effect. ### PHP Version 8.x ### Operating System _No response_