Dynamically add empty index to array based on default indexes

Question

I have below array, which includes a set of default indexes, that must be present in my final array:

'entities' => [
        'deliveredAt',
        'issuedAt',
        'totals' => [
            'due',
            'gross',
            'net',
            'tax' => [
                'amount',
                'net',
                'rate',
            ],
        ]
],

The above array is saved in a variable called $entities.

Now, I have a 3rd party API, that will return the above entities, but only include them in the response if the entity contains a value.

For example, a $response can look like this:

array:2 [▼
  "issuedAt" => "2020-08-20"
  "totals" => array:1 [▼
    "tax" => []
  ]
]

As you can see, if comparing the returned array with the indexes that I expect, there is a few missing:

deliveredAt
totals.due, totals.gross, totals.net, totals.tax.amount, totals.tax.net, totals.tax.rate

I am trying to make a method that can iterate over the $response array, and check if it contains the indexes that I expect. If not, I simply want to set the index with a value of null.

Below is what I have so far:

foreach ($entities as $key => $entity) {
         if (!is_array($entity)) {
             if (!isset($response[$entity])) {
                    $response[$entity] = null;
             }
         }
}

However, this will only add an index that is not an array. In this example, it will only add: deliveredAt => null.

How can I do, so the above method can iterate through multiple at least 2 nested arrays and add the index name and null value?

And if no tax provided - should it be tax => null, or tax => [amount => null etc ]? — u_mulder
– u_mulder, Commented Aug 22, 2020 at 9:54
@u_mulder it should be tax => ['amount' => null, 'net' => null, 'rate' => null] — oliverbj
– oliverbj, Commented Aug 22, 2020 at 9:55

u_mulder · Accepted Answer · 2020-08-22 10:00:40Z

2

You can define initial array with keys and NULL (or whatever you need) as values:

$entities = [
    'deliveredAt' => null,
    'issuedAt' => null,
    'totals' => [
        'due' => null,
        'gross' => null,
        'net' => null,
        'tax' => [
            'amount' => null,
            'net' => null,
            'rate' => null,
        ],
    ]
];

// here's your real data
$realData = [
  "issuedAt" => "2020-08-20",
  "totals" => [
    "tax" => [
      'net' => 42,    
    ]
  ]
];
// now use array_replace_recursive to replace keys in `$entities` with values of `$realData`
print_r(array_replace_recursive($entities, $realData));

Fiddle.

Also note that keys from $realData that do not exist in $entities will be added to result.

answered Aug 22, 2020 at 10:00

u_mulder

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Comments

Sascha A. · Accepted Answer · 2020-08-22 12:03:15Z

1

You can use array_replace_recursive for doing this. You had only to change your associative array entities a little bit, so every property needs a initiliasation (e.g. NULL or '').

$result = array_replace_recursive($entities, $array);

Here you can test it http://sandbox.onlinephpfunctions.com/code/4688ed3240050479edeef7c9e4da16f98dbe01de

Here is the hole code:

$array = [
  "issuedAt" => "2020-08-20",
  "totals" => [
    "tax" => [
        'amount' => 100
    ]
  ]
];

$entities = [
    'deliveredAt' => NULL,
    'issuedAt' => NULL,
    'totals' => [
        'due' => NULL,
        'gross' => NULL,
        'net' => NULL,
        'tax' => [
            'amount' => NULL,
            'net' => NULL,
            'rate' => NULL
        ],
    ]
];

$result = array_replace_recursive($entities, $array);
var_dump($result);

answered Aug 22, 2020 at 12:03

Sascha A.

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2 Comments

u_mulder Over a year ago

And what's the difference with my answer?

Sascha A. Over a year ago

You are right. I was in the meantime 1 hour away and didn't saw your answer as I completed my answer and posted it. Give you 1 point.

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