Bug #75893 [NEW]: file_get_contents $http_response_header variable bugged with opcache

From: rla at systime dot dk Operating system: Ubuntu Linux 16.04 PHP version: 7.2.1 Package: opcache Bug Type: Bug Bug description:file_get_contents $http_response_header variable bugged with opcache Description: ------------ The issue: When using file_get_contents to request an http URL a magical $http_response_header variable is set in the local context. This variable (array) works as expected when accessed directly, but if we assign it to a temporary variable ($status_code_string in the example), the value is lost. Preconditions: This issue only happens when the opcache is enabled (eg. opcache.enable = 1 and opcache.enable_cli=1 for cli testing). The bug itself was discovered in php-fpm, but providing a demonstration for that is more tricky. I'm unsure of exactly how it's possible, but the issue only seems to trigger on the second run. The issue is present in PHP 7.2.1. The issue does not seem to be present in PHP 7.2.0. The issue is not present in PHP 7.1.13. Test script: --------------- <?php class debug { public static function bug() { $url = 'http://php.net'; $response = file_get_contents($url); $status_code_string = $http_response_header[0]; print('indirect ' . $status_code_string . "\n"); print('direct ' . $http_response_header[0] . "\n"); print(is_null($http_response_header[0]) . "\n"); print(is_null($status_code_string) . "\n"); } } $debug = new debug(); $debug::bug(); Expected result: ---------------- The $status_code_string variable should be equivalent to $http_response_header[0]. Neither of the variables should return true for is_null. Actual result: -------------- Only $http_response_header[0] contains the expected response. Both variables return true for is_null! -- Edit bug report at https://bugs.php.net/bug.php?id=75893&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75893&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75893&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75893&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75893&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75893&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75893&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75893&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75893&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75893&r=support Expected behavior: https://bugs.php.net/fix.php?id=75893&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75893&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75893&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75893&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75893&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75893&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75893&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75893&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75893&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75893&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75893&r=mysqlcfg