Bug #67821 [NEW]: Generator can be rewound

From: thekid@php.net Operating system: Any PHP version: 5.5.15 Package: Scripting Engine problem Bug Type: Bug Bug description:Generator can be rewound Description: ------------ A generator can be rewound if and only if its first yielded value has been fetched. As soon as we fetch the second (or any further) yielded value and *then* try to rewind it we actually get the exception. This is inconsistent. Test script: --------------- $f= function() { yield 1; yield 2; yield 3; }; $gen= $f(); foreach ($gen as $val) { var_dump($val); } foreach ($gen as $val) { var_dump($val); } // Exception("Cannot rewind a generator that was already run") # Here's the bug: foreach ($gen as $val) { var_dump($val); break; } foreach ($gen as $val) { var_dump($val); } // No exception Expected result: ---------------- int(1) Exception("Cannot rewind a generator that was already run") Actual result: -------------- int(1) int(1) int(2) int(3) -- Edit bug report at https://bugs.php.net/bug.php?id=67821&edit=1 --