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?

Answer 1

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)

Answer 2

$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