Bug #79729 [Opn]: Strings missing last character (Apache + OPcache)

Edit report at https://bugs.php.net/bug.php?id=79729&edit=1 ID: 79729 Updated by: nikic@php.net Reported by: ca at lsp dot net Summary: Strings missing last character (Apache + OPcache) Status: Open Type: Bug Package: opcache Operating System: Windows 10 PHP Version: 7.3.19 Block user comment: N Private report: N New Comment: Does opcache.optimization_level=0 fix the issue? Previous Comments: ------------------------------------------------------------------------ [2020-06-24 10:18:17] ca at lsp dot net Description: ------------ I observed a very strange behaviour in combination with Apache + OPcache today. My colleague was using the test instance of our PHP application this morning (no deployment since yesterday), and it was working fine, until suddenly the following error appeared (and didn't disappear anymore): ``` Error: Uncaught --> Smarty: Plugin 'cut_hea' not callable ``` The string "cut_hea" doesn't exist in our code base, but instead comes from a class constant string array containing the element "cut_head": ``` class SmartyModifiers { const MODIFIERS = [ "cut_head", ... ]; public static function cut_head( ... ) { ... } } ``` This class constant is being used as follows: ``` foreach (SmartyModifiers::MODIFIERS as $modifier) { $ref = SmartyModifiers::class . '::' . $modifier; $this->registerPlugin("modifier", $modifier, $ref); } ``` The error was logged inside the registerPlugin method, because SmartyModifiers::cut_hea (without the "d") doesn't exist and is therefore not callable. Now, as if this wasn't strange enough, the corresponding Sentry event also contained the same anomaly: ``` There was 1 error encountered while processing this event * environmen: Discarded unknown attribute ``` (Note the missing "t" in "environmen" vs. "environment".) To mitigate the issue, I tried to opcache_reset() and restart the Apache server, but both didn't solve the issue. The only solution I found was to disable zend_extension=php_opcache.dll temporarily (disable, restart, enable, restart). Our OPcache configuration is as follows, following the recommendations from [1]: ``` [opcache] zend_extension=php_opcache.dll opcache.memory_consumption=128 opcache.interned_strings_buffer=8 opcache.max_accelerated_files=4000 opcache.revalidate_freq=60 opcache.fast_shutdown=1 opcache.enable_cli=1 ``` [1] https://www.php.net/manual/de/opcache.installation.php ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79729&edit=1