Creating a nested array dynamically with for loop

Question

I have a loop that looks like this

$folder = [];

$explode = explode("/", $product->folder);

for($i = 0; $i < count($explode); $++)
{
    $folder[$i] = 'test'
}

dd($folder);

what I'm trying to do here is to create a nested array depending on how many folders there are based on what I get from $explode.

So ideally what I want is this

[
    "folder1" => [
        "folder2" => "test"
    ]
]

and it would carry on being nested, so if my $product->folder looks like this cat1/cat2/cat3 then the array would looks like this

[
    "cat1" => [
        "cat2" => [
            "cat3" => "product"
        ]
    ]
]

so the product value is the last element of array?

Jerson
– Jerson

2021-07-12 06:02:28 +00:00
Commented Jul 12, 2021 at 6:02 — Jerson
– Jerson, Commented Jul 12, 2021 at 6:02
Yep it's the last one.

cerberusphp
– cerberusphp

2021-07-12 06:04:08 +00:00
Commented Jul 12, 2021 at 6:04 — cerberusphp
– cerberusphp, Commented Jul 12, 2021 at 6:04
check out my answer

Jerson
– Jerson

2021-07-12 06:43:24 +00:00
Commented Jul 12, 2021 at 6:43 — Jerson
– Jerson, Commented Jul 12, 2021 at 6:43

Jerson · Accepted Answer · 2021-07-12 07:01:22Z

You can build nested array using JSON string and convert into array using json_decode

$path = 'cat1/cat2/cat3/cat4/product';

$folders = explode('/',trim($path,'/'));
$last = array_pop($folders);

$folders = str_replace(': []',': "'.$last.'"',
  array_reduce(array_reverse($folders),function($carry,$item) {
    if($carry) {
      return '{"'.$item.'": '.$carry.'}';
    }
    return '{"'.$item.'": []}';
  })
);

$folders = json_decode($folders,true);

// Test
print_r($folders);

and it will be result as :

Array
(
    [cat1] => Array
        (
            [cat2] => Array
                (
                    [cat3] => Array
                        (
                            [cat4] => product
                        )

                )

        )

)

and formatted result

[
    "cat1" => [
        "cat2" => [
            "cat3" => [
                "cat4" => "product"
            ]
        ]
    ]
]

Virender Kumar · Accepted Answer · 2021-07-12 07:48:01Z

0

Simple solution for your problem

$path = 'cat1/cat2/cat3/product';
$folder = [];
$explode = explode("/", $path);
for($i = 0; $i < count($explode)-1; $i++)
{
    if($i+1 >= count($explode)-1)
        $folder[$explode[$i]] = $explode[$i+1];
    else
        $folder[$explode[$i]] = '';
}

print_r($folder) result will be this

Array ( [cat1] => [cat2] => [cat3] => product )

answered Jul 12, 2021 at 7:48

Virender Kumar

1821 silver badge8 bronze badges

Comments

Sharky · Accepted Answer · 2021-07-12 23:14:34Z

0

Please try the following.

// Add product title first.
$folder = end($explode);

// Iterate over categories to create a nested array.
for ($counter = count($explode) - 2; $counter >= 0; $counter--) {
    $folder = [$explode[$counter] => $folder];
}

edited Jul 12, 2021 at 23:14

user633440

answered Jul 12, 2021 at 8:06

Sharky

4093 silver badges8 bronze badges

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