Bug #77515 [NEW]: A generator is closed by making a call to Generator::valid
From: knyjoh at gmail dot com
Operating system:
PHP version: 7.3.1
Package: *General Issues
Bug Type: Bug
Bug description:A generator is closed by making a call to Generator::valid
Description:
------------
A generator is closed by making a call to Generator::valid
It is not the expected behavior that a call to valid() will actually
change a state. If it is considered a correct behavior it should be
documented.
Note that the same problem exists with the current() function.
In example 1 it is clear that when reaching the loop the generator is
not closed, because the loop does not fail. Traversing a closed
generator is not allowed and would throw an exception, which means that
the generator must be open at this stage.
In example 2 however, when reaching the loop an exception is thrown
"Cannot traverse an already closed generator". The generator has
therefore been closed by the call to valid().
Test script:
---------------
1. <?php
2.
3. function generator() {
4. if (false) {
5. yield 1; // Force generator
6. }
7. }
8.
9. // Example 1
10. $values = generator();
11. foreach ($values as $value) {} // This is ok
12.
13. // Example 2
14. $values = generator();
15. $values->valid();
16. foreach ($values as $value) {} // This is not ok
Actual result:
--------------
Fatal error: Uncaught Exception: Cannot traverse an already closed
generator in /in/ab0KK:16
Stack trace:
#0 {main}
thrown in /in/ab0KK on line 16
--
Edit bug report at https://bugs.php.net/bug.php?id=77515&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77515&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77515&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77515&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=77515&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=77515&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=77515&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=77515&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=77515&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=77515&r=support
Expected behavior: https://bugs.php.net/fix.php?id=77515&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=77515&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=77515&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=77515&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77515&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=77515&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=77515&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=77515&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=77515&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=77515&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=77515&r=mysqlcfg
Thread (3 messages)
- knyjoh at gmail dot com