Bug #77275 [NEW]: OPcache optimization problem for ArrayAccess->offsetGet(string)

From: kentaro at ranvis dot com Operating system: Windows 10 PHP version: 7.3.0 Package: opcache Bug Type: Bug Bug description:OPcache optimization problem for ArrayAccess->offsetGet(string) Description: ------------ In a certain condition, a call to the class method offsetGet() via $instance['literalString'] is turned into $instance[anotherLiteral] when OPcache is enabled. Steps to reproduce: 1. On Windows x64, extract php-7.3.0-nts-Win32-VC15-x64.zip into the current directory 2. Save test script as test.php 3. Make sure no PHP built-in server is running (as shared memory matters?) 4. Launch PHP built-in server by running a command: php -c php.ini-development -d extension_dir=ext -d zend_extension=php_opcache.dll -S 127.0.0.1:8000 5. Open browser and go to http://127.0.0.1:8000/test.php The output is: string(1) "a" 6. Touch test.php to update the modification time, and wait 3 seconds (opcache.revalidate_freq) 7. Reload the browser and confirm the output Test script: --------------- <?php namespace Foo; class Bar { public function get() {} } class Record implements \ArrayAccess { public function offsetSet($offset, $value) { throw new \Exception; } public function offsetGet($offset) { var_dump($offset); } public function offsetExists($offset) { throw new \Exception; } public function offsetUnset($offset) { throw new \Exception; } } class Baz { public function run() { $a = pow(1, 2); $b = new Bar(); $c = new Bar(); $d = new Bar(); $id = $b->get('a', 'b', 'c'); $rec = new Record(); $id = $rec['a']; } } (new Baz())->run(); Expected result: ---------------- The output is: string(1) "a" Actual result: -------------- The output is: string(1) "b" -- Edit bug report at https://bugs.php.net/bug.php?id=77275&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77275&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77275&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77275&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77275&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77275&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77275&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77275&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77275&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77275&r=support Expected behavior: https://bugs.php.net/fix.php?id=77275&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77275&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77275&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77275&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77275&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77275&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77275&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77275&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77275&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77275&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77275&r=mysqlcfg