Convert multidimensional array into single array

Question

I have an array which is multidimensional for no reason

/* This is how my array is currently */
Array
(
[0] => Array
    (
        [0] => Array
                


        

Answer 1

You can do it just using a loop.

    $singleArray = array();

    foreach ($multiDimensionalArray as $key => $value){
        $singleArray[$key] = $value['plan'];
    }

Answer 2

Your sample array has 3 levels. Because the first level has only [0], you can hardcode your access into it and avoid an extra function/construct call.

(Code Demos)

1. array_walk_recursive() is handy and versatile, but for this task may be overkill and certainly a bit more convoluted in terms of readability.

   array_walk_recursive($array, function($leafvalue)use(&$flat){$flat[] = $leafvalue;});
   var_export($flat);
   

2. If this was my code, I'd be using array_column() because it is direct and speaks literally about the action being performed.

   var_export(array_column($array[0], 'plan'));
   

3. Of course a couple of `foreach() loops will perform very efficiently because language constructs generally perform more efficiently than function calls.

   foreach ($array[0] as $plans) {
       foreach ($plans as $value) {
           $flat[] = $value;
       }
   }
   var_export($flat);
   

4. Finally, as a funky alternative (which I can't imagine actually putting to use unless I was writing code for someone whom I didn't care for) I'll offer an array_merge_recursive() call with a splat operator (...).

   var_export(array_merge_recursive(...$array[0])['plan']);
   

Answer 3

Problem array:

array:2 [▼
  0 => array:3 [▼
    0 => array:4 [▼
      "id" => 8
      "name" => "Veggie Burger"
      "image" => ""
      "Category_type" => "product"
    ]
    1 => array:4 [▼
      "id" => 9
      "name" => "Veggie Pitta"
      "image" => ""
      "Category_type" => "product"
    ]
    2 => array:4 [▼
      "id" => 10
      "name" => "Veggie Wrap"
      "image" => ""
      "Category_type" => "product"
    ]
  ]
  1 => array:2 [▼
    0 => array:4 [▼
      "id" => 18
      "name" => "Cans 330ml"
      "image" => ""
      "Category_type" => "product"
    ]
    1 => array:4 [▼
      "id" => 19
      "name" => "Bottles 1.5 Ltr"
      "image" => ""
      "Category_type" => "product"
    ]
  ]
]

Solution array:

array:5 [▼
  0 => array:4 [▼
    "id" => 8
    "name" => "Veggie Burger"
    "image" => ""
    "Category_type" => "product"
  ]
  1 => array:4 [▼
    "id" => 9
    "name" => "Veggie Pitta"
    "image" => ""
    "Category_type" => "product"
  ]
  2 => array:4 [▼
    "id" => 10
    "name" => "Veggie Wrap"
    "image" => ""
    "Category_type" => "product"
  ]
  3 => array:4 [▼
    "id" => 18
    "name" => "Cans 330ml"
    "image" => ""
    "Category_type" => "product"
  ]
  4 => array:4 [▼
    "id" => 19
    "name" => "Bottles 1.5 Ltr"
    "image" => ""
    "Category_type" => "product"
  ]
]

Write this code and get your solution , $subcate is your multi dimensional array.

$singleArrayForCategory = array_reduce($subcate, 'array_merge', array());

Answer 4

I have done this with OOP style

$res=[1=>[2,3,7,8,19],3=>[4,12],2=>[5,9],5=>6,7=>[10,13],10=>[11,18],8=>[14,20],12=>15,6=>[16,17]];
class MultiToSingle{
public $result=[];
public function __construct($array){
    if(!is_array($array)){
        echo "Give a array";
    }
    foreach($array as $key => $value){
        if(is_array($value)){
            for($i=0;$i<count($value);$i++){
                $this->result[]=$value[$i];
            }  
        }else{
            $this->result[]=$value;
        }
    }
}
}

$obj= new MultiToSingle($res);
$array=$obj->result;
print_r($array);

Answer 5

Save this as a php file, simply import and use single_array() function

<?php
$GLOBALS['single_array']=[];
function array_conveter($array_list){
    if(is_array($array_list)){
        foreach($array_list as $array_ele){
            if(is_array($array_ele)){
                array_conveter($array_ele);
            }else{
                array_push($GLOBALS['single_array'],$array_ele);
            }
        }
    }else{
        array_push($GLOBALS['single_array'],$array_list);
    }
}
function single_array($mix){
    foreach($mix as $single){
        array_conveter($single);
    }return $GLOBALS['single_array'];
    $GLOBALS['single_array']=[];
}
/* Example convert your multi array to single  */
$mix_array=[3,4,5,[4,6,6,7],'abc'];
print_r(single_array($mix_array));

?>

Answer 6

I had come across the same requirement to flatter multidimensional array into single dimensional array than search value using text in key. here is my code

$data = '{
    "json_data": [{
            "downtime": true,
            "pfix": {
                "max": 100,
                "threshold": 880
            },
            "ints": {
                "int": [{
                    "rle": "pri",
                    "device": "laptop",
                    "int": "Ether3",
                    "ip": "127.0.0.3"
                }],
                "eth": {
                    "lan": 57
                }
            }
        },
        {
            "downtime": false,
            "lsi": "987654",
            "pfix": {
                "min": 10000,
                "threshold": 890
            },
            "mana": {
                "mode": "NONE"
            },
            "ints": {
                "int": [{
                    "rle": "sre",
                    "device": "desk",
                    "int": "Ten",
                    "ip": "1.1.1.1",
                    "UF": true
                }],
                "ethernet": {
                    "lan": 2
                }
            }
        }
    ]
}
';

$data = json_decode($data,true);


$stack = &$data;
$separator = '.';
$toc = array();

while ($stack) {
    list($key, $value) = each($stack);
    unset($stack[$key]);
    if (is_array($value)) {
        $build = array($key => ''); # numbering without a title.
        foreach ($value as $subKey => $node)
            $build[$key . $separator . $subKey] = $node;
        $stack = $build + $stack;
        continue;
    }
    if(!is_numeric($key)){
        $toc[$key] = $value;
    }
}


echo '<pre/>';
print_r($toc);

My output:

Array
(
    [json_data] => 
    [json_data.0] => 
    [json_data.0.downtime] => 1
    [json_data.0.pfix] => 
    [json_data.0.pfix.max] => 100
    [json_data.0.pfix.threshold] => 880
    [json_data.0.ints] => 
    [json_data.0.ints.int] => 
    [json_data.0.ints.int.0] => 
    [json_data.0.ints.int.0.rle] => pri
    [json_data.0.ints.int.0.device] => laptop
    [json_data.0.ints.int.0.int] => Ether3
    [json_data.0.ints.int.0.ip] => 127.0.0.3
    [json_data.0.ints.eth] => 
    [json_data.0.ints.eth.lan] => 57
    [json_data.1] => 
    [json_data.1.downtime] => 
    [json_data.1.lsi] => 987654
    [json_data.1.pfix] => 
    [json_data.1.pfix.min] => 10000
    [json_data.1.pfix.threshold] => 890
    [json_data.1.mana] => 
    [json_data.1.mana.mode] => NONE
    [json_data.1.ints] => 
    [json_data.1.ints.int] => 
    [json_data.1.ints.int.0] => 
    [json_data.1.ints.int.0.rle] => sre
    [json_data.1.ints.int.0.device] => desk
    [json_data.1.ints.int.0.int] => Ten
    [json_data.1.ints.int.0.ip] => 1.1.1.1
    [json_data.1.ints.int.0.UF] => 1
    [json_data.1.ints.ethernet] => 
    [json_data.1.ints.ethernet.lan] => 2
)