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[2004-12-26 07:06 UTC] gardan at gmx dot com
Description:
------------
When executing the posted code, PHP 5.0.2 and 5.0.3rc-2 crash and kill apache on the first echo. When uncommenting the first echo, it crashes on the second one.
Like this
echo($test["ab_cd"]);
echo($test->{"ab_cd"});
it works.
Reproduce code:
---------------
class arr implements ArrayAccess {
public $x = array("ab_cd" => "hello");
function offsetExists($offset) { return isset($this->x[$offset]); }
function offsetSet($offset, $value) { $this->x[$offset] = $value; }
function offsetGet($offset) { return $this->x[$offset]; }
function offsetUnset($offset) { unset($this->x[$offset]); }
function __get($offset) { return $this->x[$offset]; }
}
$test = new arr;
echo($test["ab_cd"]); // works
echo($test->{"ab_cd"}); // works
echo($test["ab"."_cd"]); // crash
echo($test->{"ab"."_cd"}); // crash
Expected result:
----------------
hellohellohellohello
Actual result:
--------------
hellohello <crash>
Windows Apache Log:
Parent: child process exited with status 3221225477 -- Restarting
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Last updated: Sun Nov 30 17:00:01 2025 UTC |
I can partially confirm this for 5.0.3 running on Windows XP. The behaviour is very unpredictable. Following you'll find some test cases and the behaviour on my system. class arr implements ArrayAccess { public $x = array("ab_cd" => "hello"); function offsetExists($offset) { return isset($this->x[$offset]); } function offsetSet($offset, $value) { $this->x[$offset] = $value; } function offsetGet($offset) { return $this->x[$offset]; } function offsetUnset($offset) { unset($this->x[$offset]); } function __get($offset) { return $this->x[$offset]; } } $test = new arr; case 1: -------------------- echo($test["ab"."_cd"]); // crashs case 2: -------------------- echo($test["ab_cd"]); // works echo($test["ab"."_cd"]); // works case 3: echo($test["ab_cd"]); // works echo($test->{"ab_cd"}); // works echo($test["ab"."_cd"]); // crashs sounds stupid, but you'll confirm it, i guessConsider this bug confirmed using Apache/2.0.52 (Gentoo/Linux) PHP/5.0.3 but is not re-producible in a small amount of code. In my case, performing strange acts got around the bug when using the array access more than once with three other variable assignments in-between the first call and second: - The first dot-concatenated call worked fine. - The second segfaulted Apache, unless: - The first call is commented out, or - The second call is placed right below the first, or - One line of three lines is commented out. - All array accesses are changed to use sprintf not dot concatenation. It doesn't matter which line of the three simple, static variable assignments is commented. This bug drove me crazy all today. I'm going to have nightmares about this bug. ;)