PHP データ処理のヒント: array_unique 関数を使用して配列から重複要素を削除する方法

$fruits = array("apple", "banana", "orange", "apple", "pear");
$result = array_unique($fruits);

print_r($result);

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [4] => pear
)

$numbers = array(1, 2, 3, 4, 3, 5, 2);
$result = array_unique($numbers);

print_r($result);

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [5] => 5
)

$students = array(
    array("name" => "Alice", "age" => 20),
    array("name" => "Bob", "age" => 25),
    array("name" => "Alice", "age" => 20),
    array("name" => "Charlie", "age" => 22)
);
$result = array_unique($students, SORT_REGULAR);

print_r($result);

Array
(
    [0] => Array
        (
            [name] => Alice
            [age] => 20
        )

    [1] => Array
        (
            [name] => Bob
            [age] => 25
        )

    [3] => Array
        (
            [name] => Charlie
            [age] => 22
        )

)