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language functions ,
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| Exemplo | Nome | Resultado |
|---|---|---|
| $a + $b | União | União de $a e $b. |
| $a == $b | Igualdade | TRUE se $a e $b tem os mesmos pares de chave/valor. |
| $a === $b | Identidade | TRUE se $a e $b tem os mesmos pares de chave/valor na mesma ordem e do mesmo tipo. |
| $a != $b | Desigualdade | TRUE se $a não é igual a $b. |
| $a <> $b | Desigualdade | TRUE se $a não é igual a $b. |
| $a !== $b | Não identidade | TRUE se $a não é identico a $b. |
O operador + acrescenta os elementos da direita no array da esquerda, contudo, chaves duplicadas NÃO são sobrescritas.
<?php
$a = array("a" => "maçã", "b" => "banana");
$b = array("a" =>"pêra", "b" => "framboesa", "c" => "morango");
$c = $a + $b; // Uniao de $a e $b
echo "União de \$a e \$b: \n";
var_dump($c);
$c = $b + $a; // União de $b e $a
echo "União de \$b e \$a: \n";
var_dump($c);
?>
Quando executado, o script produz uma saída assim:
União de $a e $b:
array(3) {
["a"]=>
string(5) "maçã"
["b"]=>
string(6) "banana"
["c"]=>
string(6) "morango"
}
União de $b e $a:
array(3) {
["a"]=>
string(4) "pêra"
["b"]=>
string(10) "framboesa"
["c"]=>
string(6) "morango"
}
Elementos do array são iguais para efeitos de comparação se eles possuem o mesmo valor e chave.
Exemplo #1 Comparando arrays
<?php
$a = array("maçã", "banana");
$b = array(1 => "banana", "0" => "maçã");
var_dump($a == $b); // bool(true)
var_dump($a === $b); // bool(false)
?>
Veja também as seções do manual sobre o tipo Array e funções de manipulação de Arrays.
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