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<?php
$array1 = array("a" => "verde", "vermelho", "azul");
$array2 = array("b" => "verde", "amarelo", "vermelho");
$result = array_intersect($array1, $array2);
print_r($result);
?>
Success #stdin #stdout 0.01s 82560KB
stdin
Standard input is empty
stdout
Array
(
    [a] => verde
    [0] => vermelho
)