#40755 [Opn->Bgs]: Increment/Decrement operator calculation oddity

ID: 40755 Updated by: derick@php.net Reported By: henson dot garth at gmail dot com -Status: Open +Status: Bogus Bug Type: Math related Operating System: Linux PHP Version: 5.2.1 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php Using and modifying the same variable when using post/pre- decrement/increment is undefined (and not only in PHP). Previous Comments: ------------------------------------------------------------------------ [2007-03-08 01:43:13] henson dot garth at gmail dot com Description: ------------ The increment/decrement operators seem to calculate out of order compared to other languages and even previous versions of PHP. I compared this report numerous times against a 4.3.11 install that I am running to verify the inconsistency. In the case of PHP 5.2.x, the increment operator seems to be processed in an inappropriate order to the rest of the statement. In 4.3.11, everything is presented just as expected (as my Expected results display below). Reproduce code: --------------- $a = array(); // Begin Test 1 $b = 0; $a[$b++] = $b; var_dump($a); $a = array(); // Begin Test 2 $b = 0; $a[$b] = $b++; var_dump($a); $a = array(); // Begin Test 3 $b = 10; $a[$b--] = $b; var_dump($a); $a = array(); // Begin Test 4 $b = 10; $a[$b] = $b--; var_dump($a); Expected result: ---------------- array(1){[0] => int(1)} array(1){[0] => int(0)} array(1){[10] => int(9)} array(1){[10] => int(10)} Actual result: -------------- array(1){[0] => int(1)} array(1){[1] => int(0)} array(1){[10] => int(9)} array(1){[9] => int(10)} ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40755&edit=1