How to implement a function with array

Question

<?php
class FileOwners
{
    public static function groupByOwners($files)
    {
        return NULL;
    }
}

$files = array
(
    "Input.txt" => "Randy",
    "Code.py" => "Stan",
    "Output.txt" => "Randy"
);

var_dump(FileOwners::groupByOwners($files));

Implement a groupByOwners function :

Accepts an associative array containing the file owner name for each file name.
Returns an associative array containing an array of file names for each owner name, in any order.

For example

Given the input:

["Input.txt" => "Randy", "Code.py" => "Stan", "Output.txt" => "Randy"]

groupByOwners returns:

["Randy" => ["Input.txt", "Output.txt"], "Stan" => ["Code.py"]]

score 5 · Accepted Answer · answered Mar 18 '17 at 03:47

<?php
class FileOwners
{
    public static function groupByOwners($files)
    {
        $result=array();
        foreach($files as $key=>$value)
        {
            $result[$value][]=$key;
        }
        return $result;
    }
}

$files = array
(
    "Input.txt" => "Randy",
    "Code.py" => "Stan",
    "Output.txt" => "Randy"
);
print_r(FileOwners::groupByOwners($files));

Output:

Array
(
    [Randy] => Array
        (
            [0] => Input.txt
            [1] => Output.txt
        )

    [Stan] => Array
        (
            [0] => Code.py
        )

)

print_r() WILL NOT RETURN THE INTENDED RESULTS for the test. Printr() is human readable which is why the test uses var_dump https://stackoverflow.com/questions/3406171/php-var-dump-vs-print-r — INSITE MOBILE, Jul 12 '22 at 00:00

score 1 · Answer 2 · answered Jul 25 '20 at 09:21

1

Here is the one witch gonna work for sure:

 function groupByOwners(array $files) : array
 {
$result =array();
foreach($files as $key =>$elem){
  $result[$elem][]=$key;
 }
return $result;
    }
$files = array
(
"Input.txt" => "Randy",
"Code.py" => "Stan",
"Output.txt" => "Randy"
 );
  var_dump(groupByOwners($files));

answered Jul 25 '20 at 09:21

albatros

11
3

THIS IS THE CORRECT ANSWER WITH THE CORRECT RETURN: array(2) { ["Randy"]=> array(2) { [0]=> string(9) "Input.txt" [1]=> string(10) "Output.txt" } ["Stan"]=> array(1) { [0]=> string(7) "Code.py" } } – INSITE MOBILE Jul 11 '22 at 23:57

score -1 · Answer 3 · edited Feb 22 '22 at 19:25

-1

$files = array("Input.txt" => "Randy", "Code.py" => "Stan","Output.txt" => "Randy");
$narr = array_fill_keys(array_keys(array_flip($files)), []);

foreach($files as $key => $value) array_push($narr[$value], $key);
return $narr;

edited Feb 22 '22 at 19:25

Syscall

19,327
10
37
52

answered Feb 22 '22 at 19:11

Diego Centeno

1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Feb 23 '22 at 02:17
The result is the same and I like the method but it is incorrect because it does not use a groupByOwners function. How will another developer find this class? – INSITE MOBILE Jul 12 '22 at 00:10

How to implement a function with array

3 Answers3