Merging Two Multidimensional Arrays on Specific Key

Merging two multidimensional arrays on specific key

You can just do a nested loop and check if the id values match, then add title to $first (or name to $second)

foreach($first as $key => $value){
    foreach($second as $value2){
        if($value['id'] === $value2['id']){
            $first[$key]['title'] = $value2['title'];
        }               
    }
}

Combine Two Multidimensional Arrays on matching key values in PHP

<?php
// Your array
$arr1 = [
  [
  'course_id' => 10,
  'topic' => 'Booda-hood, advice and an important pit.',
  'lesson_id' => 10
  ],
  [
  'course_id' => 10,
  'topic' => 'Booda-hood, advice and an important pit.',
  'lesson_id' => 11
  ]
];

$arr2 = [
  [
  'id' => 10,
  'description' => '10 Lorem Ipsum is blablabla',
  'course_title' => '10 Lorem Ipsum is blablabla'
  ],
  [
  'id' => 11,
  'description' => '11 Lorem Ipsum is blablabla',
  'course_title' => '11 Lorem Ipsum is blablabla'
  ]
];
 
// Combining arrays implementation 

foreach ( $arr2 as $k=>$v )
{
  // rename array2 `id` to `lesson_id`
  $arr2[$k]['lesson_id'] = $arr2[$k] ['id'];
  unset($arr2[$k]['id']);
}

// array_replace_recursive — Replaces elements from passed arrays into the first array recursively   
print_r(array_replace_recursive($arr1, $arr2));
?>

OUTPUT

[
  {
    "course_id": 10,
    "topic": "Booda-hood, advice and an important pit.",
    "lesson_id": 10,
    "description": "10 Lorem Ipsum is blablabla",
    "course_title": "10 Lorem Ipsum is blablabla"
  },
  {
    "course_id": 10,
    "topic": "Booda-hood, advice and an important pit.",
    "lesson_id": 11,
    "description": "11 Lorem Ipsum is blablabla",
    "course_title": "11 Lorem Ipsum is blablabla"
  }
]

Hope this helps!

Ref - array_replace_recursive

Merge two multidimensional arrays with same key pair

I think this can work for you:

$arr_1 = array(333 => array('a1' => 1));
$arr_2 = array(333 => array('a2' => 2), 444 => array('a3' => 3));

$arr_res = array_replace_recursive($arr_1, $arr_2);
var_dump($arr_res);

How to merge two multi dimensional arrays by key value in php?

In this case, I walk the arrays and construct the desired output.

$output = [];
$allMerged = array_merge($arr1, $arr2);
array_walk($allMerged, 
  function($item, $key) use (&$output) {
    print_r($item);
    if ( array_key_exists($item['month'], $output) ) {
        if ( isset($item['info']) ) {
            $output[$item['month']]['info'] = $item['info'];
        } else {
            $output[$item['month']] = $item;
        }
    } else {
        $output[$item['month']] = $item;
    }
});
print_r($output);

How can I merge between two multidimensional array respected their keys

Pretty simple, just loop the second array and merge using the key to the first array:

foreach($array2 as $key => $val) {
    $array1[$key]['event_detail'] = array_merge($array1[$key]['event_detail'],
                                                $val['event_detail']);
}

PHP library function to merge multidimensional arrays into one based on key?

I found the answer based on the same question :

$first = array_column($data['all_client'], null, 'client_id');
$second = array_column($data['all_client_document'], null, 'client_id');
$result = array_values(array_replace_recursive($first, $second));

It reproduces as what I want also and simpler, thanks anyone!

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