How to remove the parent numeric keys of php array

Question

I've an array in php something like below

Array
(
    [0] => Array
        (
            [0] => 40173
            [1] => 514081
            [2] => 363885
            [3] => 891382
        ),
    [1] => Array
        (
            [0] => 40173
            [1] => 5181
            [2] => 385
            [3] => 891382
        )

)

Now I want to remove the parents indexes 0,1... and finally want to get all the values (only unique values).

Thanks.

raina77ow · Accepted Answer · 2014-03-21T11:39:15.293

6

One possible approach is using call_user_func_array('array_merge', $arr) idiom to flatten an array, then extracting unique values with array_unique():

$new_arr = array_unique(
  call_user_func_array('array_merge', $old_arr));

Demo. Obviously, it'll work with array of any length.

edited Mar 21 '14 at 11:39

answered Mar 21 '14 at 10:45

raina77ow

103,633
15
192
229

Andre · Answer 2 · 2014-03-21T11:29:23.963

$startArray = Array
(
[0] => Array
    (
        [0] => 40173
        [1] => 514081
        [2] => 363885
        [3] => 891382
    ),
[1] => Array
    (
        [0] => 40173
        [1] => 5181
        [2] => 385
        [3] => 891382
    )

);
//Edited to handle more the 2 subarrays
$finalArray = array();

foreach($startArray as $tmpArray){
    $finalArray = array_merge($finalArray, $tmpArray);
}

$finalArray = array_unique($finalArray);

score 1 · Answer 3 · edited Jun 20 '20 at 09:12

1

Using RecursiveArrayIterator Class

$objarr = new RecursiveIteratorIterator(new RecursiveArrayIterator($yourarray));
foreach($objarr as $v) {
    $new_arr[]=$v;
}
print_r(array_unique($new_arr));

Demo

OUTPUT:

Array
(
    [0] => 40173
    [1] => 514081
    [2] => 363885
    [3] => 891382
    [5] => 5181
    [6] => 385
)

edited Jun 20 '20 at 09:12

Community

1
1

answered Mar 21 '14 at 13:06

Shankar Narayana Damodaran

68,075
43
96
126

score 0 · Answer 4 · answered Mar 21 '14 at 10:42

0

$new_array = array_merge($array1, $array2);
$show_unique = array_unique($new_array);
print_r($show_unique);

array_merge is merging the array's, array_unique is removinge any duplicate values.

answered Mar 21 '14 at 10:42

OfirH

651
1
8
19

score -1 · Answer 5 · answered Mar 21 '14 at 10:43

-1

Try something like this:

$new_array = array();

foreach($big_array as $sub_array) {
    array_merge($new_array, $sub_array);
}

$new_array = array_unique($new_array);

(code not tested, this just a concept)

answered Mar 21 '14 at 10:43

magnetronnie

505
3
16

Indeed, but the rest of the answer is, so what's the problem? – magnetronnie May 24 '14 at 08:04
Good SO answer explains what is the problem and solution + shows code. Your one looks more like comment and there is no reason for person reading the "answer" to believe it will solve the problem. If you don't feel typing one sentence explaining your approach - just add your suggestion as comment. – Alexei Levenkov May 25 '14 at 01:33
You can't add readable code to a comment. But of cource you're always welcome to edit and improve the answer, go ahead. – magnetronnie May 26 '14 at 05:42

score -1 · Answer 6 · answered Mar 21 '14 at 10:48

Try this:

$Arr = array(array(40173, 514081, 363885, 891382),
             array(40173,5181, 385,891382));

$newArr = array();

foreach($Arr as $val1)
{

foreach($val1 as $val2)
{  
     array_push($newArr, $val2);
}
}

echo '<pre>';
print_r(array_unique($newArr));

Output:

Array
(
    [0] => 40173
    [1] => 514081
    [2] => 363885
    [3] => 891382
    [5] => 5181
    [6] => 385
)

Refer: https://eval.in/124240

-- Thanks

How to remove the parent numeric keys of php array

6 Answers6

Using RecursiveArrayIterator Class