Warning: Illegal string offset [closed] - php

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I new to oop and I have a image displaying when I had a single a array query (requesting the image url only) but when I added a second dimension to the query array (image id in the table) I just ended up getting a warning message 'Warning: Illegal string offset'. I have used mysqli_fetch_assoc in the database class and then running the result through a foreach loop.
This is the message I am getting.
Thanks in advance for any help given.
page code
$user = $_SESSION['user_name'];
$query = "SELECT gallery_image, 'gallery_id' FROM gallery WHERE user_name = '$user' ORDER BY gallery_id DESC";
$result = $obj_db->get_gallery($query);
foreach ($result as $image ) {
foreach ($image as $key => $value) {
echo '<div class="gallery_item"><img src="'.$value['gallery_image'].'"></div>';
}
}
Database class code
function get_gallery($sql){
$obj_res = mysqli_query($this->obj_db_conn, $sql);
if(mysqli_errno($this->obj_db_conn)){
die ("Failed query: $strSql".$this->obj_db_conn->error);
}
$arResults = array();
while($arRow = mysqli_fetch_assoc($obj_res)){
$arResults[] = $arRow;
}
return $arResults;

Answer 1

If your var_dump output on $result give this,
array(2) {
[0]=> array(2) {
["gallery_image"]=> ""
["gallery_id"]=> ""
}
[1]=> array(2) {
["gallery_image"]=> ""
["gallery_id"]=> ""
}
}
you don't need two nested foreach loops in your page code. The one foreach loop could be enough.
$query = "SELECT gallery_image, gallery_id FROM gallery WHERE user_name = '$user' ORDER BY gallery_id DESC";
$result = $obj_db->get_gallery($query);
foreach ($result as $image ) {
echo '<div class="gallery_item"><img src="'.$image['gallery_image'].'"></div>';
}