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language functions ,
include functions ,
variable functions ,
post functions
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| Exemplo | Nome | Resultado |
|---|---|---|
| $a and $b | E | Verdadeiro (TRUE) se tanto $a quanto $b são verdadeiros. |
| $a or $b | OU | Verdadeiro se $a ou $b são verdadeiros. |
| $a xor $b | XOR | Verdadeiro se $a ou $b são verdadeiros, mas não ambos. |
| ! $a | NÃO | Verdadeiro se $a não é verdadeiro. |
| $a && $b | E | Verdadeiro se tanto $a quanto $b são verdadeiros. |
| $a || $b | OU | Verdadeiro se $a ou $b são verdadeiros. |
A razão para as duas variantes dos operandos "and" e "or" é que eles operam com precedências diferentes. (Veja Precedência de Operadores.)
Exemplo #1 Ilustrando operadores lógicos
<?php
// foo() nunca será chamada como estes operadores são short-circuit
$a = (false && foo());
$b = (true || foo());
$c = (false and foo());
$d = (true or foo());
// "||" tem maior precedência que "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);
// "&&" tem maior precedência que "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);
?>
O exemplo acima irá imprimir algo similar a:
bool(true) bool(false) bool(false) bool(true)
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