array_unique
Description
The array_unique of Array for PHP removes duplicate values from an array.
Syntax
array_unique(
array $array,
int $flags = SORT_STRING
): arrayParameters
array
The input array.
flags
The optional second parameter flags may be used to modify the sorting behavior using these values:
| Constant | Description |
|---|---|
| SORT_REGULAR | compare items normally (don't change types) |
| SORT_NUMERIC | compare items numerically |
| SORT_STRING | compare items as strings |
| SORT_LOCALE_STRING | compare items as strings, based on the current locale |
Return
Returns the filtered array.
Examples
1 · array
<?
$array = array("a" => "green", "red", "b" => "green", "blue", "red", "4", 4, "3", 3);
$return = array_unique($array);
print_r($return);
?>Array
(
[a] => green
[0] => red
[1] => blue
[3] => 4
[5] => 3
)
2 · flags · SORT_REGULAR
<?
$array = array("a" => "green", "red", "b" => "green", "blue", "red", "4", 4, "3", 3);
$flags = SORT_REGULAR;
$return = array_unique($array, $flags);
print_r($return);
?>Array
(
[a] => green
[0] => red
[1] => blue
[3] => 4
[5] => 3
)
3 · flags · SORT_NUMERIC
<?
$array = array("a" => "green", "red", "b" => "green", "blue", "red", "4", 4, "3", 3);
$flags = SORT_NUMERIC;
$return = array_unique($array, $flags);
print_r($return);
?>Array
(
[a] => green
[3] => 4
[5] => 3
)
4 · flags · SORT_STRING
<?
$array = array("a" => "green", "red", "b" => "green", "blue", "red", "4", 4, "3", 3);
$flags = SORT_STRING;
$return = array_unique($array, $flags);
print_r($return);
?>Array
(
[a] => green
[0] => red
[1] => blue
[3] => 4
[5] => 3
)
5 · flags · SORT_LOCALE_STRING
<?
$category = LC_ALL;
$locale = "en_US";
setlocale($category, $locale);
$array = array("a" => "green", "red", "b" => "green", "blue", "red", "4", 4, "3", 3);
$flags = SORT_LOCALE_STRING;
$return = array_unique($array, $flags);
print_r($return);
?>Array
(
[a] => green
[0] => red
[1] => blue
[3] => 4
[5] => 3
)
Links
Array
- array
- array_change_key_case
- array_chunk
- array_column
- array_combine
- array_count_values
- array_diff
- array_diff_assoc
- array_diff_key
- array_diff_uassoc
- array_diff_ukey
- array_fill
- array_fill_keys
- array_filter
- array_flip
- array_intersect
- array_intersect_assoc
- array_intersect_key
- array_intersect_uassoc
- array_intersect_ukey
- array_key_exists
- array_key_first
- array_key_last
- array_keys
- array_map
- array_merge
- array_merge_recursive
- array_multisort
- array_pad
- array_pop
- array_product
- array_push
- array_rand
- array_reduce
- array_replace
- array_replace_recursive
- array_reverse
- array_search
- array_shift
- array_slice
- array_splice
- array_sum
- array_udiff
- array_udiff_assoc
- array_udiff_uassoc
- array_uintersect
- array_uintersect_assoc
- array_uintersect_uassoc
- array_unshift
- array_values
- array_walk
- array_walk_recursive
- arsort
- asort
- compact
- count
- current
- end
- extract
- in_array
- key
- key_exists
- krsort
- ksort
- list
- natcasesort
- natsort
- next
- pos
- prev
- range
- reset
- rsort
- shuffle
- sizeof
- sort
- uasort
- uksort
- usort
