How to write a implement of function

Question

1.00/5 (1 vote)

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PHP

<?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 that:
1.Accepts an associative array containing the file owner name for each file name.
2.Returns an associative array containing an array of file names for each owner name, in any order.

What I have tried:

Quote:
For example that I thought, for associative array ["Input.txt" => "Randy", "Code.py" => "Stan", "Output.txt" => "Randy"] the groupByOwners function should return ["Randy" => ["Input.txt", "Output.txt"], "Stan" => ["Code.py"]].

Posted 17-Mar-17 16:31pm

Member 13064822

Updated 10-Apr-20 4:05am

v2

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4 solutions

Solution 3

PHP

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

Posted 18-Aug-17 2:04am

Member 13367166

Updated 18-Aug-17 2:05am

v2

Solution 4

public static function groupByOwners($files) {

$file_return = [];
//print_r($files);

foreach ($files as $x => $x_value) {
if (array_key_exists($x_value, $file_return)) {
array_push($file_return[$x_value], $x);
} else {
$file_return[$x_value] = array();
array_push($file_return[$x_value], $x);
}
}
//print_r($file_return);

foreach ($file_return as $key => $value) {
if (isset($value[1])) {
$output = "['" . $key . "' => ['" . $value[0] . "','" . $value[1] . "'],";
//echo"['" . $key . "' => ['" . $value[0] . "','" . $value[1] . "'],";
} else {
$output = $output. " '" . $key . "' => ['" . $value[0] . "']]";
//echo " '" . $key . "' => ['" . $value[0] . "']]";
}
}
return $output;
}

Posted 11-Oct-18 17:46pm

Member 14016851

Solution 5

<?php

function groupByOwners(array $files) : array
{
    $list = [];
    foreach ($files as $key => $value) {
    	$list[$key][] = $value; 
    }
    return $list;
}

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

Posted 10-Apr-20 4:05am

Member 14798208

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Peter Leow · Accepted Answer · 2017-03-17T18:51:00

You will need an associative array where each key is associated with an array of files, to achieve this, try this:

public static function groupByOwners($files)
{
	foreach($files as $file => $name) {
		
		if (isset($newArray[$name])) {
            // if key exists, add to its array of elements
			array_push($newArray[$name], $file);
		} else {
            // else create a new array element
			$newArray[$name] = array($file);
		}
	}

	return $newArray;
}