Combine three array into one inside foreach - php

Question

$cats_array = array(1,7,28);
foreach ($cats_array as $category) {
$category_field_query = "SELECT fields
FROM categories
WHERE status = 1 AND id = $category";
$category_field_query_run = mysqli_query($connect, $category_field_query);
$cat_field = mysqli_fetch_object($category_field_query_run);
$field = explode(",", $cat_field->fields); /* Explode ',' from '/'3'/,' */
$field = str_replace("/","",$field); /* Delete all '/' */
print_r($field);
}
Inside foreach loop, my query returns something like that /7/,/13/,/24/ from fields for every turn, then I clean them from slashes and commas.
My goal is collect all that arrays inside one array.
I tried to create an empty array outside of foreach and sum all in it but it returned empty.

Answer 1

You have to be define $filed as a array before foreach loop. now you can store value into $filed. note that you have to multidimensional array required to store value.
$cats_array = array(1,7,28);
$field = array();
foreach ($cats_array as $category) {
$category_field_query = "SELECT fields FROM categories WHERE status = 1 AND id = $category";
$category_field_query_run = mysqli_query($connect, $category_field_query);
$cat_field = mysqli_fetch_object($category_field_query_run);
$field1 = explode(",", $cat_field->fields); /* Explode ',' from '/'3'/,' */
$field[] = str_replace("/","",$field1); /* Delete all '/' */
}
print_r($field);

Answer 2

I don't understand why do you store the fields like that, but here is a possible solution:
$fields = array();
$cats_array = array(1,7,28);
foreach ($cats_array as $category) {
$category_field_query = "SELECT fields FROM categories WHERE status = 1 AND id = $category";
$category_field_query_run = mysqli_query($connect, $category_field_query);
$cat_field = mysqli_fetch_object($category_field_query_run);
preg_match_all('/\/(\d+)\//', $cat_field->fields, $matches);
if (!empty($matches[1])) {
$fields = array_merge($fields, $matches[1]);
}
}
print_r($fields);

Answer 3

$fields = array();
$cats_array = array(1,7,28);
foreach ($cats_array as $category) {
$category_field_query = "SELECT fields FROM categories WHERE status = 1 AND id= $category";
$category_field_query_run = mysqli_query($connect, $category_field_query);
$cat_field = mysqli_fetch_object($category_field_query_run);
$field = explode(",", $cat_field->fields); // Explode ',' from '/'3'/,'
$field = str_replace("/", "", $field);
$fields[] = $field;
}
print_r($fields);