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(PHP 4 >= 4.0.6, PHP 5)
array_filter — Filtra os elementos da array usando uma função de callback
Itera sobre cada valor de input passando-os para a função callback . Se a função callback retornar true, o valor atual de input é retornado na matriz resultado. Os índices das matrizes são preservados.
O array a ser iterado
A função callback a ser usada
Se nenhum callback é fornecido, todas entradas de input iguais a FALSE (veja convertendo para booleano) serão removidas.
Retorna o array filtrado.
Exemplo #1 Exemplo de array_filter()
<?php
function impar($var)
{
return($var & 1);
}
function par($var)
{
return(!($var & 1));
}
$array1 = array("a" => 1, "b" => 2, "c" => 3, "d" => 4, "e" => 5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
echo "Impares: \n";
print_r(array_filter($array1, "impar"));
echo "Pares: \n";
print_r(array_filter($array2, "par"));
?>
O exemplo acima irá imprimir:
Impares:
Array
(
[a] => 1
[c] => 3
[e] => 5
)
Pares:
Array
(
[0] => 6
[2] => 8
[4] => 10
[6] => 12
)
Exemplo #2 array_filter() sem callback
<?php
$entry = array(
0 => 'foo',
1 => false,
2 => -1,
3 => null,
4 => ''
);
print_r(array_filter($entry));
?>
O exemplo acima irá imprimir:
Array ( [0] => foo [2] => -1 }
Se o array é modificado por uma função callback (e.g. elemento adicionado, deletado ou apagado) o comportamento desta função é indefinido.
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