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Bug #15380 Invalid Type Conversion In XOR Operand
Submitted: 2002-02-05 04:54 UTC Modified: 2002-02-27 08:17 UTC
From: jury at elkor dot lv Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.2.0-dev OS: ANY
Private report: No CVE-ID: None
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From: jury at elkor dot lv
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 [2002-02-05 04:54 UTC] jury at elkor dot lv 
Invalid Calculation when you make XOR operation between strings like: "12" ^ "9".

It needs to change type from "String" => "Double"

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 [2002-02-05 05:38 UTC] yohgaki@php.net 
Verified with 4.2.0-dev. (ZE1)
This bug can make nasty bug in script that is really hard to find.

status = Critical
 [2002-02-05 10:52 UTC] sander@php.net 
Some results (exactly the same with ZE1 and 2):
echo "12" ^ "9"; // output: nothing
echo "hello"."12" ^ "9"; // output: Q
echo "hello12" ^ "9"; // output: Q
echo "hello".("12" ^ "9"); // output: hell
Yes, that's hell and not hello!
 [2002-02-27 07:49 UTC] derick@php.net 
Not critical, assinging to me to check it out.
 [2002-02-27 08:17 UTC] derick@php.net 
Actually, it's not a bug, but an undocumented feature.
What hapens is this:

When both operands are strings, the characters in those strings are XORed like this:

result[0] = string1[0] ^ string2[0]
result[1] = string1[1] ^ string2[1]

For your example this is:
result[0] = '1' ^ '9'

which is:
#8 (the backspace character).

I'm fixing the documentation now.

Derick
 
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