Bug #15380 Updated: Invalid Type Conversion In XOR Operand

ID: 15380 Updated by: derick@php.net Reported By: jury@elkor.lv -Status: Assigned +Status: Closed Bug Type: Scripting Engine problem Operating System: ANY PHP Version: 4.2.0-dev Assigned To: derick New Comment: 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 Previous Comments: ------------------------------------------------------------------------ [2002-02-27 07:49:25] derick@php.net Not critical, assinging to me to check it out. ------------------------------------------------------------------------ [2002-02-05 10:52:10] 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! ------------------------------------------------------------------------ [2002-02-05 05:38:12] 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 04:54:00] jury@elkor.lv Invalid Calculation when you make XOR operation between strings like: "12" ^ "9". It needs to change type from "String" => "Double" ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=15380&edit=1