Convert array of single-element arrays to one a dimensional array

Question

I have this kind of an array:

Array
(
    [0] => Array
        (
            [0] => 88868
        )
    [1] => Array
        (
            [0] => 88867
        )
    [2] => Array
        (
            [0] => 88869
        )
    [3] => Array
        (
            [0] => 88870
        )
)

I need to convert this to one dimensional array. How can I do that?

For example like this..

Array
(
    [0] => 88868
    [1] => 88867
    [2] => 88869
    [3] => 88870 
)

Any php built in functionality is available for this array conversion?

score 113 · Accepted Answer · answered Jan 06 '12 at 08:05

113

For your limited use case, this'll do it:

$oneDimensionalArray = array_map('current', $twoDimensionalArray);

This can be more generalized for when the subarrays have many entries to this:

$oneDimensionalArray = call_user_func_array('array_merge', $twoDimensionalArray);

answered Jan 06 '12 at 08:05

deceze

491,798
79
706
853

1

I don't understand 'current'. I see on doc php callable $callback, but on example not see function or code for this. I apreciate some example. – abkrim Nov 08 '15 at 17:47
4

@abkrim current() function returns the value of the current element in an array. for ex : $fruits = array("banana", "apple", "orange"); echo current($fruits) //will return "banana" since current pointer is on index 0 which is banana. – Rafique Mohammed Jun 02 '16 at 10:17

score 20 · Answer 2 · edited Sep 08 '17 at 05:03

The PHP array_merge^Docs function can flatten your array:

$flat = call_user_func_array('array_merge', $array);

In case the original array has a higher depth than 2 levels, the SPL in PHP has a RecursiveArrayIterator you can use to flatten it:

$flat = iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($array)), 0);

See as well: Turning multidimensional array into one-dimensional array

score 4 · Answer 3 · answered Jan 06 '12 at 08:09

4

try:

$new_array = array();
foreach($big_array as $array)
{
    foreach($array as $val)
    {
        array_push($new_array, $val);
    }    
}

print_r($new_array);

answered Jan 06 '12 at 08:09

redmoon7777

4,378
1
23
25

score 3 · Answer 4 · answered Jan 06 '12 at 08:09

3

$oneDim = array();
foreach($twoDim as $i) {
  $oneDim[] = $i[0];
}

answered Jan 06 '12 at 08:09

marioosh

25,903
44
135
187

score 1 · Answer 5 · answered Jan 06 '12 at 08:07

1

Yup.

$values = array(array(88868), array(88867), array(88869), array(88870));
foreach ($values as &$value) $value = $value[0];

http://codepad.org/f9KjbCCb

answered Jan 06 '12 at 08:07

benesch

5,121
1
21
35

score 0 · Answer 6 · answered Jan 17 '21 at 12:51

While some of the answers on the page that was previously used to close this page did have answers that suited this question. There are techniques for this specific question that do not belong on the other page because of the input data structure.

The sample data structure here is an array of single-element, indexed arrays.

var_export(array_column($array, 0));

Is all that this question requires.

score 0 · Answer 7 · answered Feb 02 '22 at 15:49

0

foreach($array as $key => $value){
   //check that $value is not empty and an array
   if (!empty($value) && is_array($value)) {
      foreach ($value as $k => $v) {
         //pushing data to new array
         $newArray[] = $v;
      }
   }
}

answered Feb 02 '22 at 15:49

Somesh Bawane

1
2

Convert array of single-element arrays to one a dimensional array

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