Bug #81442 [Com]: Deprecation warning(?) does not trigger error handler

Edit report at https://bugs.php.net/bug.php?id=81442&edit=1 ID: 81442 Comment by: rkaiser at gmail dot com Reported by: rkaiser at gmail dot com Summary: Deprecation warning(?) does not trigger error handler Status: Not a bug Type: Bug Package: Unknown/Other Function Operating System: CentOS 7.7 PHP Version: 8.0.10 Block user comment: N Private report: N New Comment: Ah, fair enough. If I include test() in a separate file it does hit the error handler. That said, it still doesn't hit the handler (the first time) in that case if opcache is enabled. From your comment in https://bugs.php.net/bug.php?id=80058 it sounds like this is open bug https://bugs.php.net/bug.php?id=73665. I will add a note there that it's still an issue in 8.0.10. Previous Comments: ------------------------------------------------------------------------ [2021-09-15 19:16:31] nikic@php.net An error handler cannot catch a *compile-time* deprecation warning in the same file. It will work just fine for warnings in other files though. ------------------------------------------------------------------------ [2021-09-15 18:50:32] rkaiser at gmail dot com Description: ------------ If you have a function with parameter with a default value preceding a required parameter (https://www.php.net/manual/en/migration80.deprecated.php), you get a deprecation warning (or notice? not clear which it is). However this warning doesn't get caught by set_error_handler() for some reason. I first noticed this while using opcache (see https://bugs.php.net/bug.php?id=73665) but then noticed it repros even without opcache enabled. Test script: --------------- set_error_handler(function ($errno, $errstr, $errfile, $errline) { // This never hits die('caught in error handler'); }); function test($a = 1, $b ) { echo 'this executes'; } // Displays "Deprecated: Required parameter $b follows optional parameter $a" test(null, null); Expected result: ---------------- I would expect the error handler to catch this warning. Actual result: -------------- Function executes and displays the warning. If set_error_handler() is not supposed to catch this, is there another mechanism in PHP 8 to catch this warning at runtime? It's often not practical to fix the references in 3rd party code that hasn't been updated for PHP 8 yet. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81442&edit=1