remove duplicate values from multidimensional array by single value - php

Question

Ok the thing is, Ive read and tried a lot of solutions found here based on complete duplicateness, BUT I need something a little bit different and cant figure it out...
Because I only want to get and remove the duplicate value if only 1 of the array values is duplicate.
And also later combine the two but that's not that difficult.
$a = array(
array(
'id' => 1,
'qty' => 1
),
array(
'id' => 0,
'qty' => 1
),
array(
'id' => 1,
'qty' => 2
)
);
What I want the outcome to be:
$b = array(
array(
'id' => 1,
'qty' => 3
),
array(
'id' => 0,
'qty' => 1
)
);

Answer 1

You can do something like the following:
<?php
$a = array(
array(
'id' => 1,
'qty' => 1
),
array(
'id' => 0,
'qty' => 1
),
array(
'id' => 1,
'qty' => 2
)
);
$idsList = array();
$res = array();
foreach ($a as $arr){
if (!in_array($arr['id'], $idsList)){
$res[$arr['id']] = $arr;
$idsList[] = $arr['id'];
}
else{
$res[$arr['id']]['qty'] += $arr['qty'];
}
}
echo "<pre>";
print_r($res);
To get array like that:
Array
(
[1] => Array
(
[id] => 1
[qty] => 3
)
[0] => Array
(
[id] => 0
[qty] => 1
)
)
Checkout This DEMO: http://codepad.org/UP0G7WnE

Answer 2

$a = array(
array(
'id' => 1,
'qty' => 1
),
array(
'id' => 0,
'qty' => 1
),
array(
'id' => 1,
'qty' => 2
)
);
$b = array();
$ids = array();
for($i = 0; $i < count($a); $i++)
{
if(in_array($a[$i]['id'], $ids))
{
$j = array_search($a[$i]['id'], array_values($ids));
$b[$j]['qty'] += $a[$i]['qty'];
}
else
{
$b[$i]['id'] = $a[$i]['id'];
$b[$i]['qty'] = $a[$i]['qty'];
$ids[] = $a[$i]['id'];
}
}
echo "<pre>";
print_r($b);

Answer 3

This could be a solution:
$temp = array();
foreach ($a as $data){
if (isset($temp[$data['id']])){
$temp[$data['id']] += $data['qty'];
} else {
$temp[$data['id']] = $data['qty'];
}
}
// Format array
$b = array();
foreach ($temp as $id => $qty){
$b[] = array(
'id' => $id,
'qty' => $qty
);
}
Output will be:
Array
(
[0] => Array
(
[id] => 1
[qty] => 3
)
[1] => Array
(
[id] => 0
[qty] => 1
)
)