Array Merge with array value as key

Question

I am trying to convert an multi-dimentional array of product data where the PayPal email is set as one of the array values(can be same for some). I need help on merging those as arrays where the paypal_email key is same. Here is the print_r of the array that I have.

I need the array to merged as a multi-dimentional array with the paypal email as key and other data as values.. For example,

How can I do that?
Thanks

@NigelRen, yes I did. There was so many approaches that I lost track :( — Abhik
– Abhik, Commented Jul 9, 2018 at 5:53
@Abhik, I know the feeling, but non-demonstration of effort leads to negative voting on SO, as it reads: code this for me. — Progrock
– Progrock, Commented Jul 9, 2018 at 6:09
@Progrock, that was not the intention mate, just lost the track of the tries. — Abhik
– Abhik, Commented Jul 9, 2018 at 6:54
@Abhik, I'm sure it wasn't your intention, just warning you, as your question may be downvoted or even closed :) — Progrock
– Progrock, Commented Jul 9, 2018 at 8:02

Kapsonfire · Accepted Answer · 2018-07-09 05:54:38Z

3

$orders = [.....]; //your array
$mappedOrders = [];
foreach($orders as $order) {
    $mail = $order['paypal_email'];
    if(!isset($mappedOrders[$mail])) { $mappedOrders[$mail] = []; }  //create new array in map if $mail index not exists
    $mappedOrders[$mail][] = $order;  // push order into array for mapped array
}

var_dump($mappedOrders);

answered Jul 9, 2018 at 5:54

Kapsonfire

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Goma · Accepted Answer · 2018-07-09 05:57:47Z

3

Do a loop with array key checking

$result = [];

foreach ($array as $value) {
    $email = $value['paypal_email'];          // Get email

    if (!array_key_exists($email, $result)) { // Check if already on the result array
        $result[$email] = [];                 // Create new array with email as key if not
    }

    $result[$email][] = $value;               // push value to email key
}

print_r($result);

answered Jul 9, 2018 at 5:57

Goma

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4 Comments

Kapsonfire Over a year ago

hihi almost same answer... upvote of course in this case it doesnt matter if array_key_exists or isset...

Progrock Over a year ago

No need to check and initialise an empty array for non existing keys.

Kapsonfire Over a year ago

actually you are right progrock - there's no need for it in PHP.. but its better codestyle and easier to adapt that logic to other programming languages

Progrock Over a year ago

@Kapsonfire what have other programming languages got to do with anything?

Lovepreet Singh · Accepted Answer · 2018-07-09 05:58:05Z

1

Consider first array hold by variable $array. Then iterate it with simple foreach loop and transfer data to new array $newArray with key as value in paypal_email node. Code should be:

$newArray = [];

foreach ($array as $value) {
    $newArray[$value['paypal_email']][] = $value;
}
print_r($newArray);

edited Jul 9, 2018 at 5:58

answered Jul 9, 2018 at 5:51

Lovepreet Singh

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2 Comments

Kapsonfire Over a year ago

won't work since an index may have for than one entry.. so you need an array

Progrock Over a year ago

@Kapsonfire they fixed it.

Progrock · Accepted Answer · 2018-07-09 06:03:10Z

<?php

$data = 
[
    [
        'name' => 'John',
        'email' => '[email protected]'
    ],
    [
        'name' => 'Ringo',
        'email' => '[email protected]'
    ],
    [
        'name' => 'Mick',
        'email' => '[email protected]'
    ],
    [
        'name' => 'Keith',
        'email' => '[email protected]'
    ],
];
$grouped_by_email = [];
foreach($data as $item)
    $grouped_by_email[$item['email']][] = $item;

var_export($grouped_by_email);

Output:

array (
    '[email protected]' => 
    array (
    0 => 
    array (
        'name' => 'John',
        'email' => '[email protected]',
    ),
    1 => 
    array (
        'name' => 'Ringo',
        'email' => '[email protected]',
    ),
    ),
    '[email protected]' => 
    array (
    0 => 
    array (
        'name' => 'Mick',
        'email' => '[email protected]',
    ),
    1 => 
    array (
        'name' => 'Keith',
        'email' => '[email protected]',
    ),
    ),
)

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