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## Logical Operators

Logical Operators
Example | Name | Result
--- | --- | ---
$a and $b | And | `TRUE` if both $a and $b are `TRUE`.
$a or $b | Or | `TRUE` if either $a or $b is `TRUE`.
$a xor $b | Xor | `TRUE` if either $a or $b is `TRUE`, but not both.
! $a | Not | `TRUE` if $a is not `TRUE`.
$a && $b | And | `TRUE` if both $a and $b are `TRUE`.
$a || $b | Or | `TRUE` if either $a or $b is `TRUE`.

The reason for the two different variations of "and" and "or" operators is that they operate at different precedences. (See Operator Precedence.)

Example #1 Logical operators illustrated

`<?php
// foo() will never get called as those operators are short-circuit
$a = (false && foo());
$b = (true || foo());
$c = (false and foo());
$d = (true or foo());
// "||" has a greater precedence than "or"
$e = false || true; // $e will be assigned to (false || true) which is true
$f = false or true; // $f will be assigned to false
var_dump($e, $f);
// "&&" has a greater precedence than "and"
$g = true && false; // $g will be assigned to (true && false) which is false
$h = true and false; // $h will be assigned to true
var_dump($g, $h);
?>`

Powyższy przykład wyświetli coś podobnego do:

    bool(true)
    bool(false)
    bool(false)
    bool(true)

Incrementing/Decrementing Operators
String Operators
Operators
PHP Manual