Combining two arrays by ID in PHP [duplicate] - php

Question

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Merge two indexed arrays of indexed arrays based on first column value
(2 answers)
Closed 5 months ago.
I need to compare two 2D arrays in PHP. The arrays look like this:
Array one
ID Name
11 Aa
11 Ab
12 Bb
13 Cc
14 Dd
15 Ee
Array two
ID Content
11 Cat
13 Dog
14 Donkey
Now I'd need to combine these two into an array like this:
ID Name Conent
11 Aa Cat
11 Ab Cat
12 Bb
13 Cc Dog
14 Dd Donkey
15 Ee
How can I accomplish this? I have had no luck with array_merge() or $array3 = $array1 + $array2;

Answer 1

A quick way would be to iterate over the first array and append the value from the second:
$array1 = array('11' => 'Aa', '12' => 'Bb', '13' => 'Cc', '14' => 'Dd', '15' => 'Ee');
$array2 = array('11' => 'Cat', '13' => 'Dog', '14' => 'Donkey');
$combined = array();
foreach ($array1 as $key => $val) {
$combined[$key] = $val . (isset($array2[$key]) ? ' '.$array2[$key] : '');
}
This will loop through every key/value in $array1 and add it to the $combined array. If a value in $array2 exists with the same index, it will append it to that value from $array1, separated with a space.
UPDATE: I misread the format of the arrays (again). I assumed ID was the actual index in the array, but as the example array output has both Name and Content, I'm assuming ID is an actual index string value and not the index in the array itself. To stick with the loop scenario, you can iterate through the first array and have a nested loop iterate through the second:
$array1 = array(
array('ID' => '11', 'Name' => 'Aa'),
array('ID' => '12', 'Name' => 'Bb'),
array('ID' => '13', 'Name' => 'Cc'),
array('ID' => '14', 'Name' => 'Dd'),
array('ID' => '15', 'Name' => 'Ee'),
);
$array2 = array(
array('ID' => '11', 'Content' => 'Cat'),
array('ID' => '13', 'Content' => 'Dog'),
array('ID' => '14', 'Content' => 'Donkey')
);
$combined = array();
foreach ($array1 as $arr) {
$comb = array('ID' => $arr['ID'], 'Name' => $arr['Name'], 'Content' => '');
foreach ($array2 as $arr2) {
if ($arr2['ID'] == $arr['ID']) {
$comb['Content'] = $arr2['Content'];
break;
}
}
$combined[] = $comb;
}
This will add every value in $array1 to the combined array and if, and only if, a value in $array2 contains the same ID field will it add it's Content field to the array too. This can be extended to handle any number of fields as well, either by name, or by changing the inner-if block to have $comb += $arr2; instead (which should merge all non-existing indexes).

Answer 2

You will have to make your own function:
function putThemTogether($array1, $array2) {
$output = array();
foreach($array1 as $key => $value) {
if (!isset($output[$key]))
$output[$key] = array();
$output[$key][] = $value;
}
foreach($array2 as $key => $value) {
if (!isset($output[$key]))
$output[$key] = array();
$output[$key][] = $value;
}
return $output;
}
To make this better you could make it take an arbitrary number of arguments.

Answer 3

$result = array_map (
function ($item) { return is_array($item) ? implode(' ', $item) : $item; },
array_merge_recursive($array1, $array2);
);
Note, that both arrays require string keys

Answer 4

Another solution for this is to use array_search and array_column (since PHP 5.5.0).
foreach ($array1 as $key => $val) {
$found_key = array_search($val['ID'], array_column($array2, 'ID'));
if ($found_key !== false) { $array1[$key]['Content'] = $array2[$found_key]['Content']; }
}

Answer 5

Try this I hope It'll work
function merge_two_arrays($array1,$array2) {
$data = array();
$arrayAB = array_merge($array1,$array2);
foreach ($arrayAB as $value) {
// This assumes there is a field called "id"
$id = $value['id'];
if (!isset($data[$id])) {
$data[$id] = array();
}
$data[$id] = array_merge($data[$id],$value);
}
return $data;
}
$master_array = merge_two_arrays($array1,$array2);