PHP: Get the keys with the longest string in an associative array - php

Question

I want to first get the keys with the same values and then keep the keys with the longest string. Here is the code compiled so far:
<?php
$data = array('Anna' => 1, 'Ann' => 1, 'Tommy' => 100, 'Tom' => 100);
$total = array_count_values($data);
$filtered = array_filter($data, function ($value) use ($total) {
return $total[$value] > 1;
});
print_r($filtered);
?>
The current output:
Array ( [Anna] => 1 [Ann] => 1 [Tommy] => 100 [Tom] => 100 )
My expected output:
Array ( [Anna] => 1 [Tommy] => 100)
Many thanks for help.

Answer 1

Not necessarily the most optimized solution, but you could write it up using simple check:
$data = array('Anna' => 1, 'Ann' => 1, 'Tommy' => 100, 'Tom' => 100, 'Dan' => 200, 'Danny' => 200);
$total = array_count_values($data);
$filtered = array_filter($data, function ($value) use ($total) {
return $total[$value] > 1;
});
foreach($data as $key => $value) {
$foundKey = array_search($value,$filtered);
if($foundKey){
if(strlen($foundKey) < strlen($key)){
unset($filtered[$foundKey]);
} elseif(strlen($foundKey) > strlen($key)) {
unset($filtered[$key]);
}
}
}
print_r($filtered);

Answer 2

Not sure to post it after even answer is accepted but I have simple hack for this using ksort() and array_flip():
$data = array('Anna' => 1, 'Ann' => 1, 'Tommy' => 100, 'Tom' => 100, 'Dan' => 200, 'Danny' => 200);
ksort($data);
$result=array_flip(array_flip($data));
print_r($result);
ksort(): Sort an array by key
array_flip(): Flip all keys with their associated values in an array
Demo