Bug #70255 [Opn->Nab]: Bitwise AND behaviour in if statement

Edit report at https://bugs.php.net/bug.php?id=70255&edit=1 ID: 70255 Updated by: requinix@php.net Reported by: cattyv10 at gmail dot com Summary: Bitwise AND behaviour in if statement -Status: Open +Status: Not a bug Type: Bug Package: *General Issues Operating System: Linux, (Windows maybe?) PHP Version: 5.4.44 Block user comment: N Private report: N New Comment: == has higher precedence than & so you're effectively writing if( (1) & (1 == 1) & (1) ) { // 1&true&1 -> 1&1&1 -> 1&1 -> 1 -> true if( (1) & (3 == 1) & (1) ) { // 1&false&1 -> 1&0&1 -> 0&1 -> 0 -> false if( (2) & (2 == 2) & (2) ) { // 2&true&2 -> 2&1&2 -> 0&2 -> 0 -> false http://php.net/manual/en/language.operators.precedence.php Use parentheses. Previous Comments: ------------------------------------------------------------------------ [2015-08-13 00:17:36] cattyv10 at gmail dot com Description: ------------ Strange behaviour with bitwise AND when used in if statements. Test script: --------------- <?php if(1&1 == 1&1) { echo "equal\n"; }else{ echo "not equal\n"; } //equal 0001 & 0001 if(1&3 == 1&3) { echo "equal\n"; }else{ echo "not equal\n"; } //not equal???? 0001 & 0011 if(2&2 == 2&2) { echo "equal\n"; }else{ echo "not equal\n"; } //not equal???? 0010 & 0010 ?> Expected result: ---------------- equal equal equal Actual result: -------------- equal not equal not equal ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70255&edit=1