1.2.858. Not Or Tilde¶
There are two NOT operator in PHP :
!and~. The first is a logical operator, and returns a boolean. The second is a bit-wise operator, and flips each bit.
Although they are distinct operations, there are situations where they provide the same results. In particular, when processing booleans.
Yet, ! and ~ are not the same. ~ has a higher priority, and will not yield to instanceof, while ! does.
The analyzed code has less than 10% of one of them : for consistency reasons, it is recommended to make them all the same.
<?php
// be consistent
if (!$condition) {
doSomething();
}
if (~$condition) {
doSomething();
}
?>
See also Bitwise Operators, Logical Operators and Operators Precedences.
1.2.858.1. Suggestions¶
Use the ! in logical expressions
Use the ~ in bitwise expressions, with integers for example
1.2.858.2. Specs¶
Short name |
Structures/NotOrNot |
Rulesets |
|
Exakat since |
1.8.9 |
PHP Version |
All |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Precision |
Very high |
Features |
logical-operator, bitwise-operator |
Available in |