Combining arrays from different MySQL entries and removing duplicates - php

Question

I have a MySQL database with varying rows and a specific column with arrays which I wish to combine and then remove the duplicates. For example, the following entries, row1 ([0] => 1) row2 ([0] => 2 [1] => 3) and row3 ([0] => 1 [1] => 2 [2] => 3). I need to combine them and remove duplicates like this:
rows ([0] => 1 [1] => 2 [2] => 3)
I have called the query from the database as follows and since the entries are stored by comma separation, (1,2,3), I used the explode function to get them in the format above.
$query2 = "SELECT * FROM samples_database WHERE order_id=$order_id AND micro_analysis<>'';";
$result2 = mysqli_query($conn, $query2);
$input = mysqli_fetch_array($result2);
$micro_analysis = $input['micro_analysis'];
$micro_analyses = explode(',', $micro_analysis);
print_r($result2);
From here I cannot seem to get the array from each separate row, it only gives a array result from the first row and thus affects my downstream results. How can I achieve this goal?

Answer 1

Store it as comma separated string and then explode it and make it unique. You can then use array_filter to remove any null or empty values
Also, you have missed looping the result set to fetch all values returned from the query.
Here' is the updated snippet,
$query2 = "SELECT * FROM samples_database WHERE order_id=$order_id AND micro_analysis<>'';";
$result2 = mysqli_query($conn, $query2);
$micro_analysis = '';
while($input = mysqli_fetch_array($result2))
{
$micro_analysis .= $input['micro_analysis'] . ',';
}
$micro_analysis_arr = array_filter(array_unique(explode(',', $micro_analysis)));

Answer 2

$query2 = "SELECT * FROM samples_database WHERE order_id=$order_id AND micro_analysis<>'';";
$result2 = mysqli_query($conn, $query2);
$micro_analysis = array();
while($input = mysqli_fetch_array($result2))
{
$micro_analysis[] = $input['micro_analysis'];
}
$micro_analysis_arr = array_unique($micro_analysis);
Hope this will help you