convert multidimensional array to single array using php [duplicate]

check array_reduce () built in function

<?php
$your_array = array(0 => array('payment_id' => 3160), 1 => array('action' => 'update'), 2 => array('date' => '2017-05-17 09:59:40'), 3 => array('payment_date' => '23.05.201'));
echo "<pre>";
print_r($your_array);
$convert_array = array_reduce($your_array, 'array_merge', array());
echo "<pre>";
print_r($convert_array);

then output is :

Original Array :

  Array
(
    [0] => Array
        (
            [payment_id] => 3160
        )

    [1] => Array
        (
            [action] => update
        )

    [2] => Array
        (
            [date] => 2017-05-17 09:59:40
        )

    [3] => Array
        (
            [payment_date] => 23.05.201
        )

)

Output :

 Array
(
    [payment_id] => 3160
    [action] => update
    [date] => 2017-05-17 09:59:40
    [payment_date] => 23.05.201
)

for more help

http://php.net/manual/en/function.array-reduce.php

try this,

$result = [];
foreach($array as $v)
{
  $result[key($v)] = current($v);
}

You can use RecursiveIteratorIterator along with iterator_to_array function:

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); 
$result = iterator_to_array($iterator,true);

Here is working demo.