How to merge or combine 2 arrays based on their keys in php

Question

i have 2 array and i want to merge or combine them...

Array
(
    [0] => Array
        (
            [year] => 2015
            [value] => 32
        )

    [1] => Array
        (
            [year] => 2016
            [value] => 54
        )    
)

Array
(
    [0] => Array
        (
            [year] => 2015
            [value] => 95
        )

    [1] => Array
        (
            [year] => 2016
            [value] => 2068
        )

)

i want them to look like this...

Array(
    [2015]=>array(
        [0] => 32
        [1] => 95
    )
    [2016]=>array(
        [0] => 54
        [1] => 2068
    )
)

it this possible? if ever, how?.... thanks so much

Possible duplicate of [PHP - How to merge arrays inside array](http://stackoverflow.com/questions/17041278/php-how-to-merge-arrays-inside-array) — Lekhnath, Jul 14 '16 at 12:24
Please give it a try first and share your effort. We're here to help each other learn, not do each other's work. — BeetleJuice, Jul 14 '16 at 12:24
You might start by loooking at how you created these 2 arrays in the first place, and create them correctly at that stage rather than fixing them later — RiggsFolly, Jul 14 '16 at 12:28

score 3 · Accepted Answer · answered Jul 14 '16 at 12:34

 $a = array(
     0 => array
         (
            "year" => 2015,
            "value" => 32
         ),
     1 => array
         (
            "year" => 2016,
            "value" => 54
         )  
 );

 $b = array(
     0 => array
        (
           "year" => 2015,
           "value" => 300
        ),
    1 => array
       (
           "year" => 2016,
           "value" => 5400
       )  
);

$c = array_merge($a,$b);

$output = array();
foreach($c as $key=>$val)
{
    $output[$val['year']][] = $val['value'];
}

echo '<pre>';
print_r($output);
exit;

Try this code..

@user3082963 You really should select an answer if it solves your problem. — BeetleJuice, Jul 14 '16 at 13:53

BeetleJuice · Answer 2 · 2016-07-14T12:43:07.387

1

If the original arrays are $a and $b, run this code and the result you want will be in $result

$sources = array_merge($a,$b);
$result = [];
foreach($sources as $data){
    $yr = $data['year'];
    if(!isset($result[$yr])) $result[$yr]=[];
    $result[$yr][]=$data['value'];
}

Live demo

edited Jul 14 '16 at 12:43

answered Jul 14 '16 at 12:32

BeetleJuice

39,516
19
105
165

score 0 · Answer 3 · answered Jul 14 '16 at 12:28

0

Try:

$newArr = array();
foreach($array1 as $key1=>$arr1) {
  $newArr[$arr1['year']][] = $arr1['value'];
  $newArr[$arr1['year']][] = $array2[$key]['value'];
}

answered Jul 14 '16 at 12:28

Dhara Parmar

8,021
1
16
27

that works only if both arrays are the same size, or and same configuration – Edgars Aivars Jul 14 '16 at 12:29
While this code snippet may solve the question, [including an explanation](//meta.stackexchange.com/questions/114762/explaining-entirely-code-based-answers) really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Please also try not to crowd your code with explanatory comments, as this reduces the readability of both the code and the explanations! – Blue Jul 14 '16 at 13:31

score 0 · Answer 4 · answered Jul 14 '16 at 12:39

You can also do something like this,

<?php
$test1 = [["year"=>2015,"value"=>32],["year"=>2016,"value"=>54]];
$test2 = [["year"=>2015,"value"=>95],["year"=>2016,"value"=>2068]];

$newarray=array();
foreach($test1 as $key1=>$value1){
  $temp = [$value1['value']];
  foreach($test2 as $key2=>$value2){
    if($value1['year']==$value2['year']){
    $temp[] = $value2['value'];
    }
    $newarray[$value1['year']] = $temp;
  }
}

print_r($newarray);
?>

check here : https://eval.in/605323

output is :

Array
(
    [2015] => Array
        (
            [0] => 32
            [1] => 95
        )

    [2016] => Array
        (
            [0] => 54
            [1] => 2068
        )

)

How to merge or combine 2 arrays based on their keys in php

4 Answers4

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