How to remove duplicate entries from associative array in php - php

Question

My array is
Array
(
[0] => Array
(
[id] => 20
[new_id] => 958
[affiliate_id] => 33
)
[1] => Array
(
[id] => 21
[new_id] => 959
[affiliate_id] => 45
)
[2] => Array
(
[id] => 22
[new_id] => 960
[affiliate_id] => 23
)
[3] => Array
(
[id] => 23
[new_id] => 961
[affiliate_id] => 33
)
)
and i want array
Array
(
[0] => Array
(
[id] => 20
[new_id] => 958
[affiliate_id] => 33
)
[1] => Array
(
[id] => 21
[new_id] => 959
[affiliate_id] => 45
)
[2] => Array
(
[id] => 22
[new_id] => 960
[affiliate_id] => 23
)
)
I want to remove duplicates value of affiliate_id . According to first array i am getting affiliate_id's value is 33 for two time. But i want it for one time. So in my second array (which will be my answer) i remove it.

Answer 1

Try something like this, not so pretty as array_ one liners, but still:
$existing_aff_ids = array();
$unique = array();
foreach ($affiliate as $aff) {
if (!isset($existing_aff_ids[$aff['affiliate_id']])) {
$unique[] = $aff;
$existing_aff_ids[$aff['affiliate_id']] = 1;
}
}

Answer 2

Given $affiliates as in your answer, looping over the array and checking for affiliate_id would do the trick
$unique_affiliates = array();
foreach($affiliates as $affiliate) {
$affiliate_key = $affiliate['key'];
/* Variant 1 */
$unique_affiliates[$affiliate_key] = $affiliate;
/* Variant 2 */
if(!isset($unique_affiliates[$affiliate_key])) {
$unique_affiliates[$affiliate_key] = $affiliate;
}
}
All entries in $unique_affiliates will have unique affiliate_keys. Variant 1 will contain the last occurrence of each afffiliate_key (as in your example), whereas variant 2 will add the first occurrence of any affiliate_key and just ignore all subsequent ones.

Answer 3

These are not duplicate values :
1. $input = array_map("unserialize",
array_unique(array_map("serialize", $data))
2. array_values(array_unique($data))
Both this case fails because of the unique id values are there it requires all values to be same to consider it as duplicate.
Solution:Will making the array check the value of the corresponding field.
foreach($data as $key=>$val)
{
if (is_array($val))
{
$val2 = arrayUnique($val);
}
else
{
$val2 = $val;
$newArray=array_unique($data);
$newArray=deleteEmpty($newArray);
break;
}
if (!empty($val2))
{
$newArray[$key] = $val2;
}
}
print_r($newArray);