Bug #14805 Updated: array_unique works opposed to the manual
ID: 14805
User updated by: pgerzson@freestart.hu
Reported By: pgerzson@freestart.hu
Status: Open
Bug Type: Arrays related
Old Operating System: MS Windows 98
Operating System: MS Windows 98 PWS 4.0
Old PHP Version: 4.0.6
PHP Version: 4.1.1
New Comment:
I tested the examples with PHP 4.1.1 on Apache 1.3.9 under debian
stable. array_unique() does preserve the *first* key
of every related value in this environment.
Simone Cortesi <cortesi@php.net> stated on phpdoc list:
" On my PHP Version 4.0.6 on System Windows 95/98 4.10
" (as it reads with phpinfo), I get...
what I got, but
" On the same machine using Cygwin and PHP/4.0.8-dev
" I get:
the expected result (returning with the first keys).
Previous Comments:
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[2002-01-02 13:20:30] pgerzson@freestart.hu
I forgot to mention that there may be something wrong with
array_unique itself. There are three values of 3 considered equal in the
example above:
2 => "3"(string), 4 => 3(int), 5 => "3" (string)
[manual]
" Two elements are considered equal if and only if (string)
" $elem1 === (string) $elem2. In words: when the string
" representation is the same."
Why does array_unique use the index 4 in this case?
(It's neither the first nor the latest key of value 3)
------------------------------------------------------------------------
[2002-01-02 12:48:29] pgerzson@freestart.hu
The manual (recent version from cvs) states that :
" array_unique() will keep the first key encountered for every value,
and ignore all following keys. "
I've tested the two examples in this page and I've found
this statement is not true.
<?php
$input = array (4,"4","3",4,3,"3");
$result = array_unique ($input);
var_dump($result);
?>
output: /* PHP 4.0.6 Win'98 PWS */
array(2) {
[3]=>
int(4)
[4]=>
int(3)
}
but the manual says it should print:
array(2) {
[0]=>
int(4)
[1]=>
string(1) "3"
}
As you can recognize the latest keys are preserved
for both value 4 and 3.
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Thread (5 messages)