Adding to multidimensional arrays PHP - php

Question

In my function im storing in $var1 a query from the database of posts. And im storing in $var2 a query from the database of images from the posts. (Each has a key post_id to connect them.)
$var1 will return something like this.
array (
[0] => stdClass Object
(
[post_id] => 210
[post_title] => title
)
[1] => stdClass Object
(
[post_id] => 212
[post_title] => title
)
)
and $var2 will return something like this.
array (
[0] => stdClass Object
(
[post_id] => 210
[post_meta_key] => image
[post_meta_value] => image_value
)
[1] => stdClass Object
(
[post_id] => 212
[post_meta_key] => flag
[post_meta_value] => flag_value
)
[2] => stdClass Object
(
[post_id] => 210
[post_meta_key] => image
[post_meta_value] => image_value
)
[3] => stdClass Object
(
[post_id] => 102
[post_meta_key] => image
[post_meta_value] => image_value
)
)
I would like to create a foreach from $var1 and if $var1[post_id] = $var2[post_id] than $var1 will be edited to something like this
array (
[0] => stdClass Object
(
[post_id] => 210
[post_title] => title
[image] => stdClass Object
(
[0] => image_value
[1] => image_value
)
)
[1] => stdClass Object
(
[post_id] => 212
[post_title] => title
)
)
How can i do this?

Answer 1

foreach ($var1 as &$post1)
{
foreach($var2 as $post2)
{
if ($post1->post_id == $post2->post_id)
{
$post1->image = (object)array(
$post2->post_meta_value
);
}
}
}

Answer 2

Better use arrays instead of objects here:
foreach ($var2 as $key2=>$var2){
if (!empty($var1[$key2])){
$var1[$key2]['image']->$var2;
}
}
You could cast arrays and objects back and forth with
$array = (array)$object;
$object = (object)$array;

Answer 3

This is what you want:
foreach ( $var1 as $v1 )
{
foreach ( $var2 as $v2 )
{
if ( $v1['post_id'] == $v2['post_id'] )
$v1['image'][] = $v2['post_meta_value'];
}
}