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array_unique

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

array_unique — Removes duplicate values from an array

Опис

array_unique(array $array, int $flags = SORT_STRING): array

Takes an input array and returns a new array without duplicate values.

Note that keys are preserved. If multiple elements compare equal under the given flags, then the key and value of the first equal element will be retained.

Зауваження: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2, i.e. when the string representation is the same, the first element will be used.

Параметри

array

The input array.

flags

The optional second parameter flags may be used to modify the comparison behavior using these values:

Comparison type flags:

Значення, що повертаються

Returns the filtered array.

Журнал змін

Версія Опис
7.2.0 If flags is SORT_STRING, formerly array has been copied and non-unique elements have been removed (without packing the array afterwards), but now a new array is built by adding the unique elements. This can result in different numeric indexes.

Приклади

Приклад #1 array_unique() example

<?php

$input = ["a" => "green", "red", "b" => "green", "blue", "red"];
$result = array_unique($input);
print_r($result);

?>

Поданий вище приклад виведе:

Array
(
    [a] => green
    [0] => red
    [1] => blue
)

Приклад #2 array_unique() and types

<?php

$input = [4, "4", "3", 4, 3, "3"];
$result = array_unique($input);
var_dump($result);

?>

Поданий вище приклад виведе:

array(2) {
  [0] => int(4)
  [2] => string(1) "3"
}

Примітки

Зауваження: Note that array_unique() is not intended to work on multi dimensional arrays.

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