CODEWITHSUNDEEP
phparrays
Ben H
Ben H

Reputation: 512

get value by key of php object array

I have a PHP object and I am trying to get the value by the key without using a foreach.

If I do the below I am able to get the value:

$item_data_decode->meta_data[0]->value;

but the items may be in different orders so cannot count on this method and I need to use the key however this doesn't work:

$item_data_decode->meta_data['First Name'];

Code: 

$item_data_decode = json_decode($item_values);
if (!empty($item_data_decode->meta_data)) {
    $fName = $item_data_decode->meta_data['First Name']->value;
}

Object:

$a = new stdClass();
$a->meta_data = array();
$a->meta_data[0] = new stdClass();
$a->meta_data[0]->id = "2113";
$a->meta_data[0]->key = "First Name";
$a->meta_data[0]->value = "Recipient First Name";
$a->meta_data[1] = new stdClass();
$a->meta_data[1]->id = "2114";
$a->meta_data[1]->key = "Last Name";
$a->meta_data[1]->value = "Recipient Last Name";
$a->meta_data[2] = new stdClass();
$a->meta_data[2]->id = "2115";
$a->meta_data[2]->key = "addressLine 1";
$a->meta_data[2]->value = "Recipient Address Line 1";
$a->meta_data[3] = new stdClass();
$a->meta_data[3]->id = "2116";
$a->meta_data[3]->key = "addressLine2";
$a->meta_data[3]->value = "Recipient Address Line 2";
$a->meta_data[4] = new stdClass();
$a->meta_data[4]->id = "2117";
$a->meta_data[4]->key = "City";
$a->meta_data[4]->value = "Recipient Town/City";
$a->meta_data[5] = new stdClass();
$a->meta_data[5]->id = "2118";
$a->meta_data[5]->key = "Region";
$a->meta_data[5]->value = "Recipient Region/County";
$a->meta_data[6] = new stdClass();
$a->meta_data[6]->id = "2119";
$a->meta_data[6]->key = "Country";
$a->meta_data[6]->value = "N/A";
$a->meta_data[7] = new stdClass();
$a->meta_data[7]->id = "2120";
$a->meta_data[7]->key = "Postcode";
$a->meta_data[7]->value = "Recipient Postcode";


// outputs
[meta_data] => Array ( [0] => stdClass Object ( [id] => 2113 [key] => First Name [value] => Recipient First Name ) [1] => stdClass Object ( [id] => 2114 [key] => Last Name [value] => Recipient Last Name ) [2] => stdClass Object ( [id] => 2115 [key] => addressLine 1 [value] => Recipient Address Line 1 ) [3] => stdClass Object ( [id] => 2116 [key] => addressLine2 [value] => Recipient Address Line 2 ) [4] => stdClass Object ( [id] => 2117 [key] => City [value] => Recipient Town/City ) [5] => stdClass Object ( [id] => 2118 [key] => Region [value] => Recipient Region/County ) [6] => stdClass Object ( [id] => 2119 [key] => Country [value] => N/A ) [7] => stdClass Object ( [id] => 2120 [key] => Postcode [value] => Recipient Postcode ) )

Adding true to the json_decode provides the following:

Array ( [id] => 232 [order_id] => 320 [name] => Tb [product_id] => 50 [variation_id] => 0 [quantity] => 1 [tax_class] => [subtotal] => 50 [subtotal_tax] => 0 [total] => 50 [total_tax] => 0 [taxes] => Array ( [total] => Array ( ) [subtotal] => Array ( ) ) [meta_data] => Array ( ) ) Array ( [id] => 233 [order_id] => 320 [name] => Turtle Bay Gift Card [product_id] => 50 [variation_id] => 0 [quantity] => 1 [tax_class] => [subtotal] => 30 [subtotal_tax] => 0 [total] => 30 [total_tax] => 0 [taxes] => Array ( [total] => Array ( ) [subtotal] => Array ( ) ) [meta_data] => Array ( [0] => Array ( [id] => 2113 [key] => First Name [value] => Recipient First Name ) [1] => Array ( [id] => 2114 [key] => Last Name [value] => Recipient Last Name ) [2] => Array ( [id] => 2115 [key] => addressLine 1 [value] => Recipient Address Line 1 ) [3] => Array ( [id] => 2116 [key] => addressLine2 [value] => Recipient Address Line 2 ) [4] => Array ( [id] => 2117 [key] => City [value] => Recipient Town/City ) [5] => Array ( [id] => 2118 [key] => Region [value] => Recipient Region/County ) [6] => Array ( [id] => 2119 [key] => Country [value] => N/A ) [7] => Array ( [id] => 2120 [key] => Postcode [value] => Recipient Postcode ) ) )

Upvotes: 3

Views: 45094

Answers (3)

BritishWerewolf
BritishWerewolf

Reputation: 3968

Accessing each property is how you normally access a property of an object.
Note that since "First name" has a space, it cannot be accessed by the arrow notation and must be enclosed in curly braces. For any property that doesn't have a space, there is no need for the curly braces.

The reason your code was failing is because you were trying to access properties using the square bracket notation used for arrays.

I am aware that you are not able to edit the actual array output, but if you can edit the JSON then this will solve your problems.

{
    "meta_data": {
        "First name": {
            "id": 2113,
            "key": "First name",
            "value": "Recipient First Name"
        },
        "Last Name": {
            "id": 2114,
            "key": "Last Name",
            "value": "Recipient Last Name"
        },
        "addressLine 1": {
            "id": 2115,
            "key": "addressLine 1",
            "value": "Recipient Address Line 1"
        },
        "addressLine2": {
            "id": 2116,
            "key": "addressLine2",
            "value": "Recipient Address Line 2"
        },
        "City": {
            "id": 2117,
            "key": "City",
            "value": "Recipient Town/City"
        },
        "Region": {
            "id": 2118,
            "key": "Region",
            "value": "Recipient Region/County"
        },
        "Country": {
            "id": 2119,
            "key": "Country",
            "value": "N/A"
        },
        "Postcode": {
            "id": 2120,
            "key": "Postcode",
            "value": "Recipient Postcode"
        }
    }
}

var_dump($item_data_decode->meta_data->{"First name"}->value); // outputs "Recipient First Name"

Upvotes: 4

jh1711
jh1711

Reputation: 2328

Personally I would prepare the data like this:

$item_data_decode = json_decode($item_values, true);
$meta_array = array_combine(array_column($item_data_decode['meta_data'], 'key'), $item_data_decode['meta_data']);

if (!empty($meta_array['First Name'])) {
  $fName = $meta_array['First Name']['value'];
}

The second param in json_decode makes sure it returns only arrays (Manual.). This way you can use array function like array_column (Manual) and array_combine(Manual), and get an array that is very close to the structure you want.

Test Case, since no code is to short for it.

Upvotes: 3

B. Fleming
B. Fleming

Reputation: 7220

If you can modify the array structure, then structure it like this:

array(
    'First Name'=>array(
        'id'=>2113,
        'value'=>'Recipient First Name'
    ),
    'Last Name'=>array(
        'id'=>2114,
        'value'=>'Recipient Last Name'
    ),
    . . .
);

You can then still use this array in a foreach loop as before if needed, albeit with some changes, while being able to access the value you want directly.

If you can't modify the array structure, then you're out of luck and a foreach loop is required if you want to find the value you want.

If your concern is performance of accessing the array multiple times, then consider transforming the array to the structure above before processing.

Edit

Example array transformation:

$transformed_array = array();
foreach($item_data_decode->meta_data as $data) {
    $transformed_array[$data['key']] = array(
        'id'=>$data['id'],
        'value'=>$data['value']
    );
}

Upvotes: 0

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