Get Unique from Multi-dimentional array based on one key - PHP [duplicate] - php

Question

This question already has answers here:
Filter/Remove rows where column value is found more than once in a multidimensional array
(4 answers)
Closed 9 months ago.
Referring to this question & this, i have a little different problem here.
I have an array like this:
Array
(
[0] => Array
(
[name] => "Size"
[value] => "Large"
[id] => "1201"
)
[1] => Array
(
[name] => "Size"
[value] => "Small"
[id] => "1203"
)
[2] => Array
(
[name] => "Size"
[value] => "Medium"
[id] => "1204"
)
[3] => Array
(
[name] => "Size"
[value] => "Large"
[id] => "1205"
)
[4] => Array
(
[name] => "Size"
[value] => "Large"
[id] => "1206"
)
[5] => Array
(
[name] => "Size"
[value] => "Large"
[id] => "1207"
)
)
Above array have repetition of Large Three times, i want to identify unique on key based value. and remove that index (0,1,2,3,4,5) from that array.
Mentioned questions contains problems like this, but not the exact problem i am facing.
I am trying like this:
array_map("unserialize", array_unique(array_map("serialize", $input)));
but not working.

Answer 1

Since you have not answered my question yet I assume "id" is irrelevant.
By using array_column to make the array associative on "value" and it will delete any duplicates, then array_values will reset the keys to indexed.
This way you don't have to loop at all.
$arr = array_values(array_column($arr, NULL, "value"));
var_dump($arr);
output:
array(3) {
[0]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(5) "Large"
["id"]=>
string(4) "1207"
}
[1]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(5) "Small"
["id"]=>
string(4) "1203"
}
[2]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(6) "Medium"
["id"]=>
string(4) "1204"
}
}
https://3v4l.org/aOhVS
If you want to keep the lowest "id", and the "id" is higher the further down in the array you go (as in your example), then you can use rsort($arr); before the code.
rsort($arr);
$arr = array_values(array_column($arr, NULL, "value"));
var_dump($arr);
output:
array(3) {
[0]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(5) "Small"
["id"]=>
string(4) "1203"
}
[1]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(6) "Medium"
["id"]=>
string(4) "1204"
}
[2]=>
array(3) {
["name"]=>
string(4) "Size"
["value"]=>
string(5) "Large"
["id"]=>
string(4) "1201"
}
}
https://3v4l.org/VtgAM

Answer 2

You could try make a foreach creating another array like you need
$arrayOrdenado = array();
foreach($array as $a){
$arrayOrdenado[$a["value"]][] = $a;
}