Remove duplicated values completely deleted from array in php - php

Question

I want to remove the values from array which are same.
For example:
This is the array.
Array ( [0] => 1 [1] => 63 [2] => 1 )
is there any function or something in core php which return me only the value which is not duplicate i.e value with index number 1 and delete index 0 and 2, I want the result
Array ( [1] => 63)
Is there any way?

Answer 1

You can use array_filter() and array_count_values() to check the count is not greater then 1.
<?php
$data = [1, 63, 1];
$data = array_filter($data, function ($value) use ($data) {
return !(array_count_values($data)[$value] > 1);
});
print_r($data);
https://3v4l.org/uIVLN
Result:
Array
(
[1] => 63
)
Will also work fine with multiple dupes: https://3v4l.org/eJSTY

Answer 2

One option is to use array_count_values to count the values. Loop and push only the 1 values
$arr = array(1,63,1);
$arrKey = array_flip( $arr ); //Store the key
$result = array();
foreach( array_count_values($arr) as $k => $v ) {
if ( $v === 1 ) $result[ $arrKey[$k] ] = $k;
}
echo "<pre>";
print_r( $result );
echo "</pre>";
This will result to:
Array
(
[1] => 63
)
Doc: array_count_values

Answer 3

I believe that the best solution is the following:
function removeDuplicates(array $initialArray) : array
{
// Remove duplicate values from an array
$uniqueValues = array_unique($initialArray);
// Computes the difference of arrays with additional index check
$duplicateValues = array_diff_assoc($initialArray, $uniqueValues);
// Removed any values in both arrays
return array_diff($uniqueValues, $duplicateValues);
}
This solution utilises the following functions in PHP:
array_unique
array_diff_asoc
array_diff

Answer 4

You can use array_keys() with a search value as the second parameter to see how many times a value exists.
$array = [1, 63, 1, 12, 64, 12];
$new = [];
foreach ($array as $value) {
// Get all keys that have this value. If there's only one, save it.
if (count(array_keys($array, $value)) == 1) {
$new[] = $value;
}
}
Demo: https://3v4l.org/G1DCg
I don't know the performance of this compared to the other answers. I leave the profiling to someone else.