How to check for a value in a multi dimensional array - php

Question

My Array is below
$sample_arr = Array
(
[0] => Array
(
[index] => 0
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 4
[qty] => 50
[ref] => ref
)
[1] => Array
(
[index] => 1
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 20
[ref] => ref 2
)
[2] => Array
(
[index] => 2
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 21
[ref] => ref 2
)
)
As you can see in the above array there is article_Id twice in the array with value 6
I would like to find the details of the second row so that I can make the second row qty 41 i.e my result array will be like the one below
I have tried the in_array function but still there is something missing
I also tried with the foreach but the problem is that how to get the first appearance row qty? i.e in the $sample_arr when the user adds the third record with article_Id 6 the second row must be updated as shown below
$result_arr = Array
(
[0] => Array
(
[index] => 0
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 4
[qty] => 50
[ref] => ref
)
[1] => Array
(
[index] => 1
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 41
[ref] => ref goes here
)
)

Answer 1

Looks like article ID is unique. So, we can kep storing data in this $newArray variable with the key as article ID.
Every time, it's checked if a record containing the article id exists. If so, the quantity is added. If not, it's appended to the $newArray.
$newArray = array();
foreach($sample_arr as $arr) {
if (isset($newArray[$arr['article_Id']])) {
$newArray[$arr['article_Id']]['qty'] += $arr['qty'];
$newArray[$arr['article_Id']]['ref'] = 'Ref goes here'; // If this the string that replaces the ref
} else {
$newArray[$arr['article_Id']] = $arr;
}
}
$newArray = array_values($newArray);
Output:
Array
(
[0] => Array
(
[index] => 0
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 4
[qty] => 50
[ref] => ref
)
[1] => Array
(
[index] => 1
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 41
[ref] => ref 2
)
)

Answer 2

Try the following:
$new_merged_array = array();
if(!empty($sample_arr )){
foreach($sample_arr as $sample_ar){
if(!empty($sample_ar) && isset($sample_ar['article_Id'])){
if(isset($new_merged_array[$sample_ar['article_Id']])){
$new_merged_array[$sample_ar['article_Id']]['qty'] += $sample_ar['qty'];
}else{
$new_merged_array[$sample_ar['article_Id']] = $sample_ar;
}
}
}
}
print_r($new_merged_array);
Output will be:
Array(
[4] => Array
(
[index] => 0
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 4
[qty] => 50
[ref] => ref
)
[6] => Array
(
[index] => 1
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 41
[ref] => ref 2
)
)
Another way:
$new_merged_array = $sample_array = array();
if(!empty($sample_arr )){
foreach($sample_arr as $sample_ar){
if(!empty($sample_ar) && isset($sample_ar['article_Id'])){
if(isset($new_merged_array[$sample_ar['article_Id']])){
$new_merged_array[$sample_ar['article_Id']]['qty'] += $sample_ar['qty'];
}else{
$new_merged_array[$sample_ar['article_Id']] = $sample_ar;
}
}
}
}
if(!empty($new_merged_array )){
foreach($new_merged_array as $new_merged_arr){
$sample_array[] = $new_merged_arr;
}
}
print_r($sample_array);
Output will be:
Array(
[0] => Array
(
[index] => 0
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 4
[qty] => 50
[ref] => ref
)
[1] => Array
(
[index] => 1
[in_id] => 309
[date] => 2016-08-01
[article_Id] => 6
[qty] => 41
[ref] => ref 2
)
)

Answer 3

$sample_arr = array
(
0 => array
(
'index'=> 0,
'in_id' => 309,
'date' => '2016-08-01',
'article_Id' => 4,
'qty' => 50,
'ref' => 'ref'
),
1 => array
(
'index' => 1,
'in_id' => 309,
'date' => '2016-08-01',
'article_Id' => 6,
'qty' => 20,
'ref' => 'ref 2'
),
2 => array
(
'index' => 2,
'in_id' => 309,
'date' => '2016-08-01',
'article_Id' => 6,
'qty' => 21,
'ref' => 'ref 2'
)
);
$articleArray = [];
foreach($sample_arr as $key=>$value){
$articleId = $value['article_Id'];
if(array_key_exists($articleId,$articleArray)){
$articleArray[$articleId]['qty'] = $articleArray[$articleId]['qty'] + $value['qty'];
}else{
$articleArray[$articleId] = $value;
}
}
$articleArray = array_values($articleArray);
print_r($sample_arr);
print_r($articleArray);
Demo

Answer 4

in_array() does not work on multidimensional arrays. You could write a recursive function to do that for you:
function in_array_r($needle, $haystack, $strict = false) {
foreach ($haystack as $item) {
if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) {
return true;
}
}
return false;
}
Usage:
$b = array(array("Mac", "NT"), array("Irix", "Linux"));
echo in_array_r("Irix", $b) ? 'found' : 'not found';