Remove duplicates from PHP which has multiple arrays [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.
This is the current output I have from an array by doing var_dump($getvals):
array(2) {
["value"]=>string(5) "150mm"
["label"]=>string(5) "150mm"
}
array(2) {
["value"]=>string(5) "150mm"
["label"]=>string(5) "150mm"
}
array(2) {
["value"]=>string(5) "150mm"
["label"]=>string(5) "150mm"
}
array(2) {
["value"]=>string(5) "150mm"
["label"]=>string(5) "150mm"
}
array(2) {
["value"]=>string(5) "125mm"
["label"]=>string(5) "125mm"
}
array(2) {
["value"]=>string(5) "125mm"
["label"]=>string(5) "125mm"
}
What I want to achieve is first of all, to ignore the ['label'] tables and then try removing any duplicates (150mm and 125mm). I have tried both array_unique and !inarray() but it won't work. Here is my code:
$getvals = get_sub_field('option_diameter'); // This is my array
$takens = array(); // I create an empty array for later on
foreach ($getvals as $key => $getval){ // Running through the array
if ($key == 'value'){ // Ignoring Label table
if(!in_array($getval, $takens)){ // Check if the current value is already inside $takens array
$takens[] = $getval; // If not, then put it
}
}
}
var_dump($takens); // The output is below
This is what I get from var_dump($takens) :
array(1) {
[0]=>string(5) "150mm"
}
array(1) {
[0]=>string(5) "150mm"
}
array(1) {
[0]=>string(5) "150mm"
}
array(1) {
[0]=>string(5) "150mm"
}
array(1) {
[0]=>string(5) "125mm"
}
array(1) {
[0]=>string(5) "125mm"
}
The duplicate values are not removed. Any ideas?

Answer 1

Use a key to remove the duplicate, Demo
$result = [];
foreach($array as $arr){
$result[$arr['value']] = $arr;
}
print_r(array_values($result));

Answer 2

You need to first fetch value by using array_diff_key. Then you need to use array_column, in which passing null as second parameter and unique by value as key to removing duplicates(as keys can not be duplicated). Then to reset indexes array_values
Here is the script,
$takens = array_values(array_column(array_map(function ($a) {
return array_diff_key($a, ['label' => '']);
}, $getvals), null, 'value'));
Demo
Output:-
array(2) {
[0]=>
array(1) {
["value"]=>
string(5) "150mm"
}
[1]=>
array(1) {
["value"]=>
string(5) "125mm"
}
}

Answer 3

You can use array_column
$r = array_values(array_column($a, null, 'label'));
OR
if you want to keep single column
$r = array_values(array_column($a, 'value', 'label'));
print_r($r);
array_values will reorder the keys of the array
Working example :- https://3v4l.org/n8SA1

Answer 4

It look like you forgot a foreach.
Here a test done a few minutes ago :
$aArrayTest = array (
array(
'value'=>'150mm',
'label'=>'150mm'
),
array(
'value'=>'150mm',
'label'=>'150mm'
),
array(
'value'=>'150mm',
'label'=>'150mm'
),
array(
'value'=>'150mm',
'label'=>'150mm'
),
array(
'value'=>'125mm',
'label'=>'125mm'
),
array(
'value'=>'125mm',
'label'=>'125mm'
)
);
$aArrayResult = array();
foreach ($aArrayTest as $aArray) { // Running through the array of Arrays
foreach ($aArray as $key => $value){ // Running through each array
if ($key == 'value'){ // Ignoring Label table
if(!in_array($value, $aArrayResult)){ // Check if the current value is already inside $takens array
$aArrayResult[] = $value; // If not, then put it
}
}
}
}
var_dump($aArrayResult);</pre>