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[2008-03-16 12:33 UTC] pawel dot jacek dot matysiak at gmail dot com
Description:
------------
I've encountered a problem when working with array of objects and using mentioned library function array_unique. It just doesn't work.
Reproduce code:
---------------
<?php
class Test
{
public $x;
public function __construct($x)
{
$this->x = $x;
}
}
$temp[] = new Test(1);
$temp[] = new Test(1);
var_dump($temp);
$temp2 = array_unique($temp);
var_dump($temp2);
?>
Expected result:
----------------
I expected the function to return the array with only one object. It could return unchanged array but I think it would not make any sense.
Actual result:
--------------
error: Catchable fatal error: Object of class Test could not be converted to string in test.php on line 13
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Last updated: Thu May 02 21:01:31 2024 UTC |
Says the documentation: "array_unique() sorts the values treated as string at first, then will keep the first key encountered for every value, and ignore all following keys. It does not mean that the key of the first related value from the unsorted array will be kept." "Note: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same. The first element will be used." Then, this isn't a bug. <?php class foo { public function __toString() { return 'Hi'; } } var_dump(array_unique(array(new foo, new foo))); /* array(1) { [0]=> object(foo)#1 (0) { } } */