Merging two arrays with weight of index in both - php

Question

I have two array like this and want to merge like
Take 1st index Array 1 check
if it is present in Array 2
Insert in Array 3
add weight of Array 1 and Array 2
else if not present
take 1st index of Array 2
Take 1st index of Array 2 and check
if it is present in Array 1
Insert in Array 3
add weight of Array 1 and Array 2
else if not present
take 2nd index of Array 1
Take 2nd index of Array 1 and check
if it is present in Array 2
Insert in Array 3
add weight of Array 1 and Array 2
else if not present
take 1st index of Array 2
Take 1st index of Array 2 and check
Note above logic is for given example
For Example
Array 1
(
[144] => Array
(
[weight] => 2
)
[145] => Array
(
[weight] => 1
)
[177] => Array
(
[weight] => 1
)
)
Array 2
(
[93] => Array
(
[weight] => 4
)
[133] => Array
(
[weight] => 4
)
[144] => Array
(
[weight] => 4
)
[145] => Array
(
[weight] => 4
)
[141] => Array
(
[weight] => 1
)
)
I want result as
Array 3
(
[144] => Array
(
[weight] => 6
)
[145] => Array
(
[weight] => 5
)
[93] => Array
(
[weight] => 4
)
[133] => Array
(
[weight] => 4
)
[177] => Array
(
[weight] => 1
)
[141] => Array
(
[weight] => 1
)
)
Thanks in Advance

Answer 1

$out = array();
foreach ($arr1 as $key => $val) {
if (isset($out[$key]['weight'])) {
$out[$key]['weight'] += $val['weight'];
} else {
$out[$key]['weight'] = $val['weight'];
}
}
foreach ($arr2 as $key => $val) {
if (isset($out[$key]['weight'])) {
$out[$key]['weight'] += $val['weight'];
} else {
$out[$key]['weight'] = $val['weight'];
}
}
print_r($out);
Also, if you have an unknown number of arrays to work with you can do this:
$arrays = array (
$arr1,
$arr2,
$arr3
// ...
};
$out = array();
foreach ($arrays as $array) {
foreach ($array as $key => $val) {
if (isset($out[$key]['weight'])) {
$out[$key]['weight'] += $val['weight'];
} else {
$out[$key]['weight'] = $val['weight'];
}
}
}
print_r($out);

Answer 2

You seems to want second array first,
then append first array
maybe this is works
$a = ...; //first array
$b = ...; // second array
var_export($a);
var_export($b);
$rtn = $tmp = array();
foreach ($b as $idx=>$arr)
{
if (isset($a[$idx]))
{
$rtn[$idx]['weight'] = $arr['weight'] + $a[$idx]['weight'];
unset($a[$idx]);
}
else
{
$tmp[$idx]['weight'] = $arr['weight'];
}
}
$res = $rtn+$tmp+$a;
print_r($res);
result
array (
144 =>
array (
'weight' => 2,
),
145 =>
array (
'weight' => 1,
),
177 =>
array (
'weight' => 1,
),
)array (
93 =>
array (
'weight' => 4,
),
133 =>
array (
'weight' => 4,
),
144 =>
array (
'weight' => 4,
),
145 =>
array (
'weight' => 4,
),
141 =>
array (
'weight' => 1,
),
)Array
(
[144] => Array
(
[weight] => 6
)
[145] => Array
(
[weight] => 5
)
[93] => Array
(
[weight] => 4
)
[133] => Array
(
[weight] => 4
)
[141] => Array
(
[weight] => 1
)
[177] => Array
(
[weight] => 1
)
)

Answer 3

it's very simple task:
array_walk($a, function(&$value, $key, $b){
$value["weight"] += isset($b[$key]["weight"])?$b[$key]["weight"]:0;
}, $b);
$ret = $a+$b
given input:
$a = array(
1 => array(
"weight" => 1
),
2 => array(
"weight" => 5
)
);
$b = array(
1 => array(
"weight" => 2
),
3 => array(
"weight" => 4
)
);
would produce:
array(3) {
[1]=>
array(1) {
["weight"]=>
int(3)
}
[2]=>
array(1) {
["weight"]=>
int(5)
}
[3]=>
array(1) {
["weight"]=>
int(4)
}
}