array_unique

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

array_uniqueRemoves duplicate values from an array

Descrierea

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.

Notă: 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.

Parametri

array

The input array.

flags

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

Sorting type flags:

  • 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.

Valorile întoarse

Returns the filtered array.

Istoricul schimbărilor

Versiune Descriere
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.

Exemple

Example #1 array_unique() example

<?php
$input 
= array("a" => "green""red""b" => "green""blue""red");
$result array_unique($input);
print_r($result);
?>

Exemplul de mai sus va afișa:

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

Example #2 array_unique() and types

<?php
$input 
= array(4"4""3"43"3");
$result array_unique($input);
var_dump($result);
?>

Exemplul de mai sus va afișa:

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

A se vedea și

Note

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