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[2012-12-27 10:37 UTC] rstoll at tutteli dot ch
Description: ------------ see test script. Seems like the weak logic operators do not have any effect. My PHP version is 5.4.7 Was already mentioned in https://bugs.php.net/bug.php?id=46530&edit=2 Test script: --------------- $a = false or true; var_dump($a); //boolean false $a = true or false; var_dump($a); //boolean true - that's ok $a = true xor true; var_dump($a); //boolean true $a = false xor true; var_dump($a); //boolean false $a = true and false; var_dump($a); //boolean true Expected result: ---------------- //or boolean true boolean true - this one worked as expected //xor boolean false boolean true //and boolean false PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Tue Apr 23 08:01:30 2024 UTC |
The OR, XOR, AND operators are special variants of the usual logic operator with different precedence. In particular they have lower precedence than '='. That's why all your assignments are interpreted like this: ($a = false) or true; Instead you should be using the normal && and || operators, those will be correctly interpreted as $a = (false || true); The reason we have the lower-precedence variants is to allow things like $result = mysql_query(...) or die(mysql_error()); This is obviously a very bad example, but probably also the one most used. It basically allows you to combine an assignment with an error check. This behavior is consistent with other languages that implement both the normal || and && operators as well as the OR and AND operators.