如何将2D数组转换为1D数组？

Question

I want to convert my 2D array into 1D array. When I do var_dump($image_name_db); It shows :

array(2) {
  [0]=>
  array(1) {
    ["image"]=>
    string(7) "pic.PNG"
  }
  [1]=>
  array(1) {
    ["image"]=>
    string(14) "abouttown3.jpg"
  }
}

Now how can I convert It into 1D array. As I want to compare two arrays. One array is 1D and other array is 2D, that is why i want 2D array in 1D. So i need both of them in 1D to compare easily. I am using codeigniter.

Answer 1

You need to traverse through the array and store images in to a 1D array.

<?php
$arr = array();
$arr[0]['image'] = 'pic.PNG';
$arr[1]['image'] = 'abouttown3.jpg';
$images = array();
if (! empty($arr)) {
  foreach ($arr as $row) {
    $images[] = $row['image'];
  }
}

echo "<br/> Existing";
echo '<pre>';
print_r($arr);
echo '</pre>';

echo "<br/> New";
echo '<pre>';
print_r($images);
echo '</pre>';

Working demo: