Bug #81431 [Com]: header_register_calback no longer allows die() to stop executing outputting

Edit report at https://bugs.php.net/bug.php?id=81431&edit=1 ID: 81431 Comment by: twosee@php.net Reported by: raoul_vanmaaren at live dot nl Summary: header_register_calback no longer allows die() to stop executing outputting Status: Open Type: Bug Package: Output Control PHP Version: 8.0.10 Block user comment: N Private report: N New Comment: I think this is caused by the unwind_exit mechanism which was introduced in 8.0. I try to explain it briefly: PHP8.x+ versions use the exception mechanism to implement exit, so the C code will continue to execute. We can verify this behavior with this example: https://3v4l.org/43HMf. I don’t know where to check for exceptions that would be more appropriate, but the behavior after applied the patch I provided is most in line with my intuition. Previous Comments: ------------------------------------------------------------------------ [2021-09-15 10:03:53] twosee@php.net The following patch has been added/updated: Patch Name: bug81431.patch Revision: 1631700233 URL: https://bugs.php.net/patch-display.php?bug=81431&patch=bug81431.patch&revision=1631700233 ------------------------------------------------------------------------ [2021-09-12 19:14:35] raoul_vanmaaren at live dot nl With output buffering on, for some reason, the expected result is produced. This is similar behaviour as previous versions. With output buffering off, it seems to behave in a different manner than the previous versions and prodduces the unexpected result. https://3v4l.org/pv9jE ------------------------------------------------------------------------ [2021-09-11 11:58:49] sjon@php.net the output buffering calls don't seem to be relevant, see https://3v4l.org/Jsq2U ------------------------------------------------------------------------ [2021-09-11 10:17:39] raoul_vanmaaren at live dot nl Description: ------------ In PHP 8.0.0 - 8.0.10, a die statement within the header_register_callback function will not prevent the trigger from being outputted. In previous versions this was the case. This is with the standard settings. I am not sure if this is caused by the performance upgrades and if this is intended or not. However, I cannot find any documentation either. Test script: --------------- <?php ob_start(); // make sure ob_level is set to 1 function callback() { echo "In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: "; die(); } header_register_callback("callback"); ob_end_clean(); echo "Trigger."; echo "Execution died before this echo statement."; Expected result: ---------------- In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: Actual result: -------------- In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: Trigger. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81431&edit=1