PHP: Remove nested arrays with only 1 key

Question

I have the following array:-

array(3) {
  [1]=>
  array(1) {
    ["A"]=>
    float(5)
  }
  [2]=>
  array(2) {
    ["A"]=>
    float(1)
    ["B"]=>
    float(3)
  }
  [3]=>
  array(2) {
    ["A"]=>
    float(5)
    ["B"]=>
    float(6)
  }
}

And I would like to remove/filter out the nested arrays that only store 1 key so it would end up like this:-

array(2) {
  [2]=>
  array(2) {
    ["A"]=>
    float(1)
    ["B"]=>
    float(3)
  }
  [3]=>
  array(2) {
    ["A"]=>
    float(5)
    ["B"]=>
    float(6)
  }
}

Is there an easy solution/way to do this?

Yes, there is an easy solution/way to do this. Have you tried anything? — axiac
– axiac, Commented Jul 14, 2017 at 10:06
I used array_filter with the specific keys (["A"]) to check if they are empty and remove them, but I thought this wouldn't be ideal as there could also be a key "C" and I would need to make all of the filters manually. — ubik
– ubik, Commented Jul 14, 2017 at 10:15

Death-is-the-real-truth · Accepted Answer · 2017-07-14 10:19:16Z

3

Do with simple foreach():-

foreach($array as $key=>$arr){
   if(count($arr) == 1){
      unset($array[$key]);
   }
}

print_r($array);

Output:- https://eval.in/832446

Or using array_filter:-

$newarray = array_filter($array, function($var) {
    return (count($var) !=1);
});

Output:-https://eval.in/832451

edited Jul 14, 2017 at 10:19

answered Jul 14, 2017 at 10:13

Death-is-the-real-truth

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Comments

Death-is-the-real-truth · Accepted Answer · 2017-07-14 10:25:39Z

The most trivial method I could think of for this activity is to use the count function of PHP.

Lets assume your array as you have defined and lets call it $originalArray-

array(3) {
  [1]=>
  array(1) {
    ["A"]=>
    float(5)
  }
  [2]=>
  array(2) {
    ["A"]=>
    float(1)
    ["B"]=>
    float(3)
  }
  [3]=>
  array(2) {
    ["A"]=>
    float(5)
    ["B"]=>
    float(6)
  }
}

Now we will iterate through the entire array to find indexes with multiple keys and push them onto a different array.

$new_array = array();

for($i=0;$i<count($originalArray);$i++)
{
   if(count($originalArray[$i])>1)
   {
     array_push($new_array,$originalArray[$i]);
   }
}

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