note 106092 added to language.operators.assignment

In response to user inca below, the &= operator is a bitwise operator, not a logical operator. Lazy evaluation applies only to logical operations. To clarify, the following two lines of code are equivalent. Both always call bar(), and both always assign a numeric value to $foo: $foo &= bar(); $foo = $foo & bar(); The following line of code is different from the the above two. It only calls bar() if $foo is (converted to) true, and always assigns a boolean value (true or false) to $foo: $foo = $foo && bar(); This will make a difference if you use the identical comparison operators: if ($foo === true) { // This will never be the case if you assigned the result of & or &= to $foo } if ($foo === 1) { // This will never be the case if you assigned the result of && to $foo } The same rules apply to the |=, | and || operators. ---- Server IP: 69.147.83.197 Probable Submitter: 203.161.90.233 ---- Manual Page -- http://www.php.net/manual/en/language.operators.assignment.php Edit -- https://master.php.net/note/edit/106092 Del: integrated -- https://master.php.net/note/delete/106092/integrated Del: useless -- https://master.php.net/note/delete/106092/useless Del: bad code -- https://master.php.net/note/delete/106092/bad+code Del: spam -- https://master.php.net/note/delete/106092/spam Del: non-english -- https://master.php.net/note/delete/106092/non-english Del: in docs -- https://master.php.net/note/delete/106092/in+docs Del: other reasons-- https://master.php.net/note/delete/106092 Reject -- https://master.php.net/note/reject/106092 Search -- https://master.php.net/manage/user-notes.php