Array to another array with blank values in php

Question

Hi i am new to php actully i want to convert this array

Array(
[0] => 
[1] => 2
[2] => 6
[3] => 7
[4] => 
[5] => 1
[6] => 5
[7] => 6
[8] => 
[9] => 1
[10] => 3
[11] => 5)

I have empty valus at index 0,4,8
to another array like

Array([0] => 2,6,7
[1] => 1,5,6
[2] => 1,3,5)

And what have you tried in order to do your homework? What are the problems? In any case, start off with a description of what you want done, then translate the whole thing into PHP. — Ulrich Eckhardt
– Ulrich Eckhardt, Commented Jan 20, 2018 at 8:31
Do you want the split to be on the blank items or in chunks of 3? — Nigel Ren
– Nigel Ren, Commented Jan 20, 2018 at 8:32

Death-is-the-real-truth · Accepted Answer · 2018-01-20 08:55:33Z

1st way if you want to group based on empty values but they are at randome indexes

$new_array = [];

$data = '';
foreach($array as $key=>$arr){
   if($arr == ''){
    if($key >0){
      $new_array[] = trim($data,',');
      $data = '';
    }
  }else{
     $data .= ','.$arr;
  }
}
$new_array[] = trim($data,',');
print_r($new_array);

Output:- https://eval.in/938714

2nd way if you want to group based on empty values and they are at sequential indexes like 0,4,8,12...

$array = array_chunk($array,4);

foreach($array as &$arr){
   $arr = trim(trim(implode(',',$arr),','));
}

print_r($array);

Output:- https://eval.in/938698

3rd way. if you want to group based on empty values and they are at sequential indexes like 0,4,8,12... (another approach)

$array = array_chunk(array_values(array_filter($array)),3);

foreach($array as &$arr){
   $arr = implode(',',$arr);
}

print_r($array);

Output:-https://eval.in/938692

Reference:-

This obviously only works with regular groups of 3. I am not sure if that is what the OP is after. I read the question as such that the "empty" items should be seen as separators regardless of where they are positioned.

RomanPerekhrest · Accepted Answer · 2018-01-20 20:51:07Z

1

Short implode() + preg_split() solution:

Extended input array is used:

$arr = ['', '', 2, 6, 7, '', '', 1, 5, 6, 8, 9, '', 1, 3, 5, 7, '', 10, 11, ''];
$result = preg_split('/,,+/', trim(implode(',', $arr), ','));

print_r($result);

The output:

Array
(
    [0] => 2,6,7
    [1] => 1,5,6,8,9
    [2] => 1,3,5,7
    [3] => 10,11
)

edited Jan 20, 2018 at 20:51

answered Jan 20, 2018 at 8:36

RomanPerekhrest

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2 Comments

splash58 Over a year ago

With such pattern it's easy to use explode(',,',

RomanPerekhrest Over a year ago

@splash58, preg_split is more unified in case if there would be multiple gaps like [' ', 1, 2, ' ', ' ', ... You may check my update

LF-DevJourney · Accepted Answer · 2018-01-20 08:43:52Z

0

When meet a '', just make a subarray and append the previous non-empty array to the result. Demo.

This only cost O(n)

$result = [];
$sub = [];
foreach($array as $v){
    if($v != ''){
        $sub[] = $v;
    }else{
        if(count($sub))  // avoid continus ''
            $result[] = $sub;
        $sub = [];
    }
}

answered Jan 20, 2018 at 8:43

LF-DevJourney

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