PHP - Get a count of Multi-dimensional arrays within an associative array and indexed arrays

Question

I have a multi-dimensional array which consists of indexed arrays within an associative array.

How can I get a separate count of indexed arrays as well as associative arrays which host the indexed array.

Using sizeof($jArray, 1) results into 197 in my case which is the total of key-value pairs + indexed arrays + associative array (49*3 + 49 + 1).

Count($jArray) results into 1, which I'm guessing is the associative array.

JSON structure:

Name
│
│───[0] 
│    └── Key -> Value
│    └── Key -> Value
│    └── Key -> Value
└───[1] 
│    └── Key -> Value
│    └── Key -> Value
│    └── Key -> Value
│...
│
└───[n]
     └── Key -> Value
     └── Key -> Value
     └── Key -> Value

The count(s) that I'm looking for here are

49 - (indexed arrays within associative array 'Name')
147 - (total key-value pairs within indexed array)
3 - (key-value pairs within an indexed array)

That count looks funny... any chance that's actually an object and not an array? — msg
– msg, Commented Sep 16, 2018 at 15:45
Any chance you can include a part of the array as Json or var_export for us to try on? — Andreas
– Andreas, Commented Sep 16, 2018 at 15:49
@Andreas, Sorry I was unable to include the json. I've managed to get the count now. Thank you for your help. — Navik Goswami
– Navik Goswami, Commented Sep 18, 2018 at 7:24

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

The following line of code reproduce your multidimensional array for test purpose:

 $arrs=array_fill_keys(['name'],array_fill(0,49,['key1'=>1,'key2'=>2,'key3'=>2,]));

According to this:

49 - (indexed arrays within associative array 'Name')

147 - (total key-value pairs within indexed array)

3 - (key-value pairs within an indexed array)

and specifically the third line,all your counts are simplified to some simple operations that you can achieve this way:

$InArWiAsArNa=count($arrs['name']);
$KV_wi_IA=count(current($arrs['name']));
$total_KV_pairs_wi_IA=$InArWiAsArNa*$KV_wi_IA;

var_dump($InArWiAsArNa,$total_KV_pairs_wi_IA,$KV_wi_IA);

output:

int(49)
int(147)
int(3)

however if you remove the third condition, for example if the key-value pairs within an indexed array number is variable, this mean you don't need it anymore so you should loop through the array to get the two first answers:

$InArWiAsArNa=0;
$total_KV_pairs_wi_IA=0;
foreach($arrs['name'] as $key=>$val){
    $InArWiAsArNa ++;
    $total_KV_pairs_wi_IA+=count($val);  
}

var_dump($InArWiAsArNa,$total_KV_pairs_wi_IA);

output:

 int(49)
 int(147)

edited Jun 20, 2020 at 9:12

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answered Sep 17, 2018 at 12:00

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1 Comment

Navik Goswami Over a year ago

Very detailed and informative. Thank you. That worked :)

melsi · Accepted Answer · 2018-09-16 15:54:15Z

you can always use count() to do that, for example if you have the following array:

 $arrs = [
'name1' => [
    [
        'key1'=>1,
        'key2'=>2,
    ],
    [
        'key3'=>3,
    ],
    [
        'key4'=>4,
        'key5'=>5,
        'key6'=>6,
    ],
],
'name2' => [
    [
        'key7'=>7,
    ],
],

];

$arrs is a multidimensional array of order 3, to get the number of elements in level 0 which are name1 and name2 (associative arrays),you can just use : count($arrs);, this will return 2. if you want the number of elements of name1 : count($arrs[name1]), this will return 3. if you want the total of elements in name1 and name2,

$total=0; foreach($arrs as $arr) $total+=count($arr); if you want the total of key-value pairs :

foreach($arrs as $arr){

foreach($arr as $ar) $total+=count($ar); }

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