Array Combine Three or More Arrays with PHP

array combine three or more arrays with php

Personally for readability I would do it this way:

$keys   = array('u1','u2','u3');
$names  = array('Bob','Fred','Joe');
$emails = array('bob@mail.com','fred@mail.com','joe@mail.com');
$ids    = array(1,2,3);
$result = array();

foreach ($keys as $id => $key) {
    $result[$key] = array(
        'name'  => $names[$id],
        'email' => $emails[$id],
        'id'    => $ids[$id],
    );
}

Combine and transpose three arrays with associative keys

utilizing functional helpers

By using array_map and array_combine, you can skip having to handle things like counts, iterators, manual array assignment, and manual array combining.

This solution reduces complexity by using procedures which hide all that complexity behind useful, functional APIs.

$names = ['a', 'b', 'c'];
$types = ['$', '%', '^'];
$prices = [1, 2, 3];

$result = array_map(function ($name, $type, $price) {
  return array_combine(
    ['name', 'type', 'price'],
    [$name, $type, $price]
  );
}, $names, $types, $prices);

echo json_encode($result, JSON_PRETTY_PRINT);

Output (some line-breaks removed for brevity)

[
  {"name": "a", "type": "$", "price": 1},
  {"name": "b", "type": "%", "price": 2},
  {"name": "c", "type": "^", "price": 3}
]

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hiding your own complexity

You can even abstract away your own complexity by defining your own procedure, array_zip_combine — which works like array_combine but accepts multiple input arrays which are first "zipped" before being combined

this solution requires PHP 7+

// PHP 7 offers rest parameter and splat operator to easily apply variadic function
function array_zip_combine (array $keys, ...$arrs) {
  return array_map(function (...$values) use ($keys) {
    return array_combine($keys, $values);
  }, ...$arrs);
}

$result = array_zip_combine(['name', 'type', 'price'], $names, $types, $prices);

same solution for PHP 5.4+

// PHP 5 doesn't offer splat operator so we have to use
// call_user_func_array to apply a variadic function
function array_zip_combine (array $keys /* args */) {
  $f = function () use ($keys) { return array_combine($keys, func_get_args()); };
  return call_user_func_array(
    'array_map',
    array_merge([$f], array_slice(func_get_args(), 1))
  );
}

$result = array_zip_combine(['name', 'type', 'price'], $names, $types, $prices);

Is there a way to combine more than two arrays just like array_combine does?

Use array_merge, to join multiple arrays in PHP.

PHP.net

• array_combine — Creates an array by using one array for keys and another for its values
• array_merge — Merge one or more arrays

Be aware! The behaviour of both is different.

How to combine three arrays without using array_merge or array_combine in php

In PHP 5.6+ You can also use ... when calling functions to unpack an array or
Traversable variable or literal into the argument list:

$array1 = array('likes', 'friends', 'USA');
$array2 = array('USA2', 'lools', 'tools');
$array3 = array('USA3', 'Awesome', 'lop');

array_push($array1, ...$array2, ...$array3);
echo "<pre>";
print_r($array1);
echo "</pre>";

demo

Merge values from multiple arrays in PHP

Use array_merge() to combine arrays, not array_push().

Remove the duplicates at the end after merging everything.

$json = $this->curl_get_marketplace_contents();
$data = json_decode($json, true);
$categories = array();
foreach ($data['themes'] as $theme) {
    $array = explode(",", $theme['categories']);
    $array = array_map('trim', $array);
    $categories = array_merge($array, $categories);
    
};
return array_unique($categories);

Merging 3 arrays in PHP

Simply foreach over the first array and use the index as the key to the other arrays.

foreach ( $array1 as $idx => $val ) {
    $all_array[] = [ $val, $array2[$idx], $array3[$idx] ];
}

Remember this will only work if all 3 arrays are the same length, you might like to check that first

how to merging multiple key and values in PHP

Direct Output

If you just need to output your array directly to the page, you could do something like this:

foreach($original_array['category_id'] as $key => $categoryid) {
    $product = $original_array['product'][$key];
    $category = $original_array['category'][$key];
    
    echo "{$categoryid} , {$product} , {$category}\n";
}

This is pretty simple and only requires a single foreach loop. This is useful if you do not need to use this data multiple times in different places.

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Formatted Array Output

If you may need to use this later in code, I would create a new array with the data in the loop above.
This is probably overkill if you don't ever need to access this data again.

$output = [];
foreach($original_array['category_id'] as $key => $categoryid) {
    $product = $original_array['product'][$key];
    $category = $original_array['category'][$key];
    
    $output[] = ['category_id' => $categoryid, 'product' => $product, 'category' => $category];
}

This would make $output be something like

Array
(
    [0] => Array
        (
            [category_id] => 1
            [product] => Apple
            [category] => Fruit
        )

    [1] => Array
        (
            [category_id] => 2
            [product] => Cow
            [category] => Meat
        )

)

Which, of course, is trivial to output in your required format.

foreach($output as $values) {
    echo "{$values['categoryid']} , {$values['product']} , {$values['category']}";
}

How to add multiple arrays to a subarray?

This is how you would use array_merge()

<?php
    $array1 = array(array("id" => 1, "name" => "world")); 
    $array2 = array("KM" => 2); 
    $array3 = array("count" => 1); 

    print_r(array(array_merge($array1[0], $array2, $array3))); 
?>

Which would output:

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => world
            [KM] => 2
            [count] => 1
        )

)

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