merge all values of keys in array php

Question

Don't know this question is asked before or not, cannot find after lot of searching.

My array looks like this,

array(3) {
  [0]=>
  array(2) {
    [0]=>
    array(1) {
      ["userId"]=>
      string(3) "421"
    }
    [1]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
  }
  [1]=>
  array(1) {
    [0]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
  }
  [4]=>
  array(2) {
    [0]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
    [1]=>
    array(1) {
      ["userId"]=>
      string(3) "421"
    }
  }
}

What I want is,

array(1) {
  [0]=>
  array(5) {
    [0]=>
    array(1) {
      ["userId"]=>
      string(3) "421"
    }
    [1]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
    [2]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
    [3]=>
    array(1) {
      ["userId"]=>
      string(3) "329"
    }
    [4]=>
    array(1) {
      ["userId"]=>
      string(3) "421"
    }
  }
}

I have tried with array_merge, array_combine and a lot of foreach() loops. But didn't get luck for desired output.

Don't know how to do this. Please help.

Saumya Rastogi · Accepted Answer · 2016-12-17 07:34:42Z

1

You can flatten your array like this:

$arr = array(array(['user' => 1], ['user' => 2]), ['user' => 3]);
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
foreach($iterator as $val) {
  $flattened_arr[0][] = $val;
}
var_dump($flattened_arr);

UPDATE: If you don't want to use RecursiveIteratorIterator, the you can also do it like this using array_walk_recursive():

$non_flat_arr = array(array(['user' => 1], ['user' => 2]), ['user' => 3]);
$objTmp = (object) array('flat_arr' => array());
array_walk_recursive($non_flat_arr, create_function('&$v, $k, &$t', '$t->flat_arr[] = $v;'), $objTmp);
var_dump([ 0 => $objTmp->flat_arr]);

This will give you the output as:

array:1 [
  0 => array:3 [
    0 => 1
    1 => 2
    2 => 3
  ]
]

Hope this helps!

edited Dec 17, 2016 at 7:34

answered Dec 17, 2016 at 7:10

Saumya Rastogi

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3 Comments

Keyur Over a year ago

Thank you very much. But what if RecursiveIteratorIterator do not supports on the live site server?(Do not know what professionally or technically 'live site server' called as).

Saumya Rastogi Over a year ago

@KeyurK - If you find this answer correct and helpful then accept & upvote this answer as it motivates me to give answers to other questions like this and helps others to quickly find the correct answer!

Keyur Over a year ago

Yes will do. Surely.

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