等价运算符如何在PHP中使用数组？

$array1 = array("a", "b", "c");
$array2 = array("a", "b", "c");
$array3 = array("a", "b", "d");

if ($array1 == $array2) {
    echo "Array1 and Array2 are equal.";
}

if ($array1 == $array3) {
    echo "Array1 and Array3 are equal.";
} else {
    echo "Array1 and Array3 are not equal.";
}

Array1 and Array2 are equal.
Array1 and Array3 are not equal.

$array1 = array("a", "b", "c");
$array2 = array("a", "b", "c");
$array2["key"] = "value";

if ($array1 == $array2) {
    echo "Array1 and Array2 are equal.";
} else {
    echo "Array1 and Array2 are not equal.";
}

Array1 and Array2 are equal.