Convert Single Array to multidimensional - php

Question

I new to PHP, I need to convert single dimension array into multi dimension array in php
I have data like this, need to minimize as below.
Array
(
[0] => Array
(
[0] => David
[1] => School
[2] => 19
[3] => 29
)
[1] => Array
(
[0] => Paul
[1] => Home
[2] => 19
[3] => 29
)
[2] => Array
(
[0] => Paul
[1] => Cinema
[2] => 19
[3] => 29
)
[3] => Array
(
[0] => Paul
[1] => Park
[2] => 19
[3] => 29
)
[4] => Array
(
[0] => Rossie
[1] => Playground
[2] => 19
[3] => 29
)
[5] => Array
(
[0] => Rossie
[1] => Hotel
[2] => 19
[3] => 29
)
[6] => Array
(
[0] => Rossie
[1] => Hospital
[2] => 19
[3] => 29
)
)
And I want convert it to multidimensional
Array
(
[0] => Array
(
[0] => Array
(
[0] => David
(
[0] => School
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
)
)
)
[1] => Array
(
[0] => Array
(
[0] => Paul
(
[0] => Home
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
[1] => Cinema
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
[1] => Park
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
)
)
)
[2] => Array
(
[0] => Array
(
[0] => Rossie
(
[0] => Playground
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
[1] => Hotel
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
[1] => Hospital
(
[0] => 19
[1] => 29
[2] => 39
[3] => 49
)
)
)
)
)
I hope you get an idea. But my function doesn't do this correctly or maybe there are other ways to do this easier ?
I would be grateful for any help.
Thanks

Answer 1

Below is one way to do it:
<?php
$arr = [array('David','School',19,29),
array('Paul','Home',19,29),
array('Paul','Cinema',19,29),
array('Paul','Park',19,29),
array('Rossie','Playground',19,29),
array('Rossie','Hotel',19,29),
array('Rossie','Hospital',19,29)];
// Get all names.
$names = array_unique(array_map(function($value){return $value[0];}, $arr));
$places = [];
// Create the multidimensional array, grouping by name.
foreach($names as $key => $name){
$tempArr = [];
foreach($arr as $record){
if($record[0] === $name){
$tempArr[][$record[1]] = array_slice($record,2);
}
}
$places[][][$name] = $tempArr;
}
print("<pre>".print_r($places,true)."</pre>");
This will return the following result:
Array
(
[0] => Array
(
[0] => Array
(
[David] => Array
(
[0] => Array
(
[School] => Array
(
[0] => 19
[1] => 29
)
)
)
)
)
[1] => Array
(
[0] => Array
(
[Paul] => Array
(
[0] => Array
(
[Home] => Array
(
[0] => 19
[1] => 29
)
)
[1] => Array
(
[Cinema] => Array
(
[0] => 19
[1] => 29
)
)
[2] => Array
(
[Park] => Array
(
[0] => 19
[1] => 29
)
)
)
)
)
[2] => Array
(
[0] => Array
(
[Rossie] => Array
(
[0] => Array
(
[Playground] => Array
(
[0] => 19
[1] => 29
)
)
[1] => Array
(
[Hotel] => Array
(
[0] => 19
[1] => 29
)
)
[2] => Array
(
[Hospital] => Array
(
[0] => 19
[1] => 29
)
)
)
)
)
)