Conversion of SplFileInfo instances to boolean
| From: | Christoph Becker | Date: | Wed, 03 Dec 2014 20:35:41 +0000 |
| Subject: | Conversion of SplFileInfo instances to boolean | ||
| Groups: | php.internals | ||
| Request: | Send a blank email to internals+get-79399@lists.php.net to get a copy of this message | ||
Hello internals,
today I stumbled over issue #65213[1] which has been reported as a bug,
but was changed to a feature request without any hint why the conversion
of SplFileInfo instances to boolean throws a catchable fatal error.
Even worse, due to optimizations in OPcache (and maybe other optimizers
as well), this does not always happen. Consider the following snippet:
<?php
$o = new SplFileObject('.');
if (!$o) {
} else {
var_dump(!$o);
}
Without any optimization this throws the error in line 4 (the if
clause); with OPcache the error is thrown in line 6. Apparently that is
caused by a optimization where BOOL_NOT,JMPZ is converted to NOP,JMPNZ[2].
IOW: with OPcache enabled
if (!$o) works fine, but without OPcache it
is an error. IMHO both should behave identically.
[1] <https://bugs.php.net/bug.php?id=65213>
[2] <http://lxr.php.net/xref/PHP_5_5/ext/opcache/Optimizer/block_pass.c#816>
--
Christoph M. Becker