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

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.

Jan Myszkier · Accepted Answer · 2018-05-21 10:09:45Z

4

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);

answered May 21, 2018 at 10:09

Jan Myszkier

2,7541 gold badge18 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jiten2015 Over a year ago

Thank you very much for your solution!

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

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

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered May 21, 2018 at 10:27

Bhaskar Jain

1,6811 gold badge12 silver badges21 bronze badges

1 Comment

jiten2015 Over a year ago

Perfect! Thank you very much for your help.

Collectives™ on Stack Overflow

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

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related