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"]]

Sahil Gulati · Accepted Answer · 2017-03-18 03:47:45Z

5

<?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
        )

)

answered Mar 18, 2017 at 3:47

Sahil Gulati

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1 Comment

INSITE GURU Over a year ago

print_r() WILL NOT RETURN THE INTENDED RESULTS for the test. Printr() is human readable which is why the test uses var_dump stackoverflow.com/questions/3406171/php-var-dump-vs-print-r

albatros · Accepted Answer · 2020-07-25 09:21:39Z

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, 2020 at 9:21

albatros

113 bronze badges

1 Comment

INSITE GURU Over a year ago

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" } }

Syscall · Accepted Answer · 2022-02-22 19:25:07Z

-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, 2022 at 19:25

Syscall

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answered Feb 22, 2022 at 19:11

Diego Centeno

1

2 Comments

Community Over a year ago

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.

INSITE GURU Over a year ago

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?

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