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Doc Bug #63129 array_unique doesn't sort
Submitted: 2012-09-21 09:50 UTC Modified: 2013-07-31 03:59 UTC
Votes:2
Avg. Score:3.0 ± 2.0
Reproduced:1 of 2 (50.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: luckylefti at web dot de Assigned: yohgaki (profile)
Status: Closed Package: Arrays related
PHP Version: Irrelevant OS: Mac OS
Private report: No CVE-ID: None
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 [2012-09-21 09:50 UTC] luckylefti at web dot de 
Description:
------------
array_unique doesn't sort the array by default for me.
I've testid it under php 5.3.15 and 5.3.10

---
From manual page: http://www.php.net/function.array-unique#refsect1-function.array-unique-description
---


Test script:
---------------
$test = array("beta","gamma","alpha", "beta");
var_dump(array_unique($test));


Expected result:
----------------
array(3) {
  [0]=>
  string(5) "alpha"
  [1]=>
  string(4) "beta"
  [2]=>
  string(5) "gamma"
}

Actual result:
--------------
array(3) {
  [0]=>
  string(4) "beta"
  [1]=>
  string(5) "gamma"
  [2]=>
  string(5) "alpha"
}

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 [2013-07-05 09:41 UTC] of dot olivier dot favre at gmail dot com 
This bug report is invalid.

The doc says that (unstable) sorting is used internally for deduplicating the 
array.
It says that the first key-value pair is kept once duplicate values are seen. By 
"first" they mean after the (unstable) sort.
Hence it is clear that as the array keeps some key-value pairs, keys are not 
reassigned and the result is not sorted.

Use array_sort(array_values(array_unique($test))) for your needs instead.
Note: This is not a workaround, it is *the* way of doing what you need.
 [2013-07-31 03:59 UTC] yohgaki@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: yohgaki
 [2013-07-31 03:59 UTC] yohgaki@php.net 
http://jp1.php.net/function.array-unique#refsect1-function.array-unique-
description

Sort flag is available since 5.2.10
 
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