converter array to key and value in array php

Question

i have array look like this:

$arr=array(
   'key1'=>'value1',
   'key2'=>'value2',
   0=>array(
      'sub1_key1'=>'sub1_value1',
      'sub1_key2'=>'sub1_value2',
   ),
   'key3'=>array(
      'sub2_key1'=>'sub2_value1',
      'sub2_key2'=>'sub2_value2',
   ),
   //....
);

how to converter array $arr to array look like this:

$arr=array(
   'key1'=>'value1',
   'key2'=>'value2',
   'sub1_key1'=>'sub1_value1',
   'sub1_key2'=>'sub1_value2',
   'sub2_key1'=>'sub2_value1',
   'sub2_key2'=>'sub2_value2',
   //....
);

somebody can help me?

Mubo · Accepted Answer · 2014-03-09 12:34:50Z

4

Try this out. This works for you hopefully.

This is not trivial, because you are going to reduce multi.dim. array to single one and also ignore the key of the first array.
I have tested the following code and it produces that result you have shown.

function ChangeArrayToSingleArray($array) {  
   if (!$array) return false; 
   $flat = array(); 
   $iterator  = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); 

   foreach ($iterator as $key=>$value)
     $flat[$key] = $value; 
     return $flat; 
} 

var_dump(ChangeArrayToSingleArray($arr));

output is some thing like.

array (size=6)
  'key1' => string 'value1' (length=6)
  'key2' => string 'value2' (length=6)
  'sub1_key1' => string 'sub1_value1' (length=11)
  'sub1_key2' => string 'sub1_value2' (length=11)
  'sub2_key1' => string 'sub2_value1' (length=11)
  'sub2_key2' => string 'sub2_value2' (length=11)

answered Mar 9, 2014 at 12:34

Mubo

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2 Comments

SaidbakR Over a year ago

Good answer too, but I think the previous one is more easier to be understood. At least for me.

Mubo Over a year ago

It uses Construct a RecursiveIteratorIterator php.net/manual/en/recursiveiteratoriterator.construct.php and RecursiveArrayIterator php.net/manual/en/class.recursivearrayiterator.php

nanobash · Accepted Answer · 2014-03-09 12:45:07Z

4

$new = array();

foreach ($arr as $key => $value) {
    if (is_array($value)) {
        foreach ($value as $k => $v) { // having nested loop to save keys and values into new array
            $new[$k] = $v;
        }
    } else {
        $new[$key] = $value; // leaving values intact
    }
}

print_r($new); // returns  Array ( [key1] => value1 [key2] => value2 [sub1_key1] => sub1_value1 [sub1_key2] => sub1_value2 [sub2_key1] => sub2_value1 [sub2_key2] => sub2_value2 )

DEMO

edited Mar 9, 2014 at 12:45

answered Mar 9, 2014 at 12:12

nanobash

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Comments

Community · Accepted Answer · 2023-11-14 22:25:35Z

1

Use array_walk () function that may help you https://www.php.net/array_walk

edited Nov 14, 2023 at 22:25

CommunityBot

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answered Mar 9, 2014 at 12:11

Mohamed Gamal

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1 Comment

SaidbakR Over a year ago

How to implement array_walk with this? Please, show us, it is possible.

zoranc · Accepted Answer · 2014-03-09 12:49:26Z

1

you can try

function flatten($array) {
   $new_array = array();
   foreach ($array as $key => $value) {
      if ( is_array($value) ) {
         $new_array = array_merge ( $new_array, flatten($value));
      } else {
         $new_array[$key] = $value;
      }
   }
   return $new_array;
}

then you can just call :

$flattened_array = flatten($arr);

in your case

this will work with any depth array as it works recursively

here's the php fiddle demo

edited Mar 9, 2014 at 12:49

answered Mar 9, 2014 at 12:14

zoranc

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2 Comments

nanobash Over a year ago

It is not saving key1 and key2 though !

nanobash Over a year ago

According to your update your function only returns first to indices, aren't you testing your code ! ?

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