merge all values of keys in array php - 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.

Answer 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!