Bug #81605 [NEW]: Regression in class loading order when __toString() is implemented

From: marco at tremani dot nl Operating system: Windows/Unix PHP version: 8.0.12 Package: Unknown/Other Function Bug Type: Bug Bug description:Regression in class loading order when __toString() is implemented Description: ------------ I'm not sure if this can be called a bug, unexpected or undefined behavior - but behavior for the test case below changed in PHP 8.0. The file below "a.php" implements this pattern: 1. include another file "b.php". 2. declare a class. If that class contains a method "__toString()", the class won't be available yet in b.php. I don't know if this is the direct cause or merely a symptom of compiler behavior. The example is a bit contrived but it demonstrates the changed behavior clearly. It was encountered and extracted when upgrading a legacy php library (nusoap). Test script: --------------- File: a.php ``` <?php include('b.php'); class a { public function __toString() { return ''; } } ``` File: b.php ``` <?php var_dump(class_exists('a')); ``` Expected result: ---------------- > php a.php bool(true) Actual result: -------------- On PHP 7.4: bool(true) On PHP 8.0: bool(false) -- Edit bug report at https://bugs.php.net/bug.php?id=81605&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81605&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81605&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81605&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81605&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81605&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81605&r=support Expected behavior: https://bugs.php.net/fix.php?id=81605&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81605&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81605&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81605&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81605&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81605&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81605&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81605&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81605&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81605&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81605&r=mysqlcfg