How to find duplicate value in sample array - php

Question

How to find duplicate value in sample array using php
Array
(
[id] => 644
[qty] => 1
[product] => 127
[super_attribute] => Array
(
[140] => 16
)
)
Array
(
[id] => 648
[qty] => 1
[product] => 111
[super_attribute] => Array
(
[140] => 18
)
)
Array
(
[id] => 652
[qty] => 1
[product] => 111
[super_attribute] => Array
(
[140] => 18
)
)
in this above array i want to find duplicate [product] => 111 and [140] => 18 . How can i achieve this?

Answer 1

One possible way to do this is to combine the two elements you're looking for into one longer key, then create a two-dimensional array listing all the IDs that have the new key.
In the code below I have multiplied the product number by 1000, added the value of super_attribute[140] and cast the result to a string. There are other ways you might obtain a new key depending on what you know about the data you're working with.
<?php
$arr = [
[
"id" => 644,
"qty" => 1,
"product" => 127,
"super_attribute" => [
"140" => 16
]
],
[
"id" => 648,
"qty" => 1,
"product" => 111,
"super_attribute" => [
"140" => 18
]
],
[
"id" => 652,
"qty" => 1,
"product" => 111,
"super_attribute" => [
"140" => 18
]
]
];
$dup = [];
foreach($arr as $subArr) {
// Calculate the new combined key
$newKey = (string)($subArr['product']*10000+$subArr["super_attribute"][140]);
// If we don't have this new key, create an array with the ID,
// otherwise, add the ID to the existing array for the new key.
if (isset($dup[$newKey])) {
$dup[$newKey][] = $subArr['id'];
} else {
$dup[$newKey] = [$subArr['id']];
}
}
var_dump($dup);
Output:
array (size=2)
1270016 =>
array (size=1)
0 => int 644
1110018 =>
array (size=2) //IDs with the combined key 111 and 18
0 => int 648
1 => int 652