Merge multiple arrays into one with unique values php [duplicate] - php

Question

This question already has answers here:
Create flat array of individual values from rows of comma-separated values fetched from a database table
(5 answers)
Closed 6 months ago.
I know that there are a lot of similar threads on Stack Overflow, but none of them works in my case.
My goal is to get the unique show genres from the database. They are stored (1,2,3 or more) comma separated in the show_genres column.
$link = mysqli_connect('127.0.0.1', 'root', 'pw', 'db');
$query = "SELECT show_genres FROM tv_shows";
$result = mysqli_query($link, $query);
foreach ($result as $value) {
$sh_genres = $value['show_genres'];
$sh_genres_array = array_map('trim', explode(',',$sh_genres));
// $doesnt_work = call_user_func_array("array_merge",
$sh_genres_array); // doesn't work for me
echo '<pre>' . var_export($sh_genres_array, true) . '</pre>';
}
My result is as follows:
array (
0 => 'Drama',
1 => 'Action',
2 => 'Crime',
)
array (
0 => 'Drama',
1 => 'Crime',
)
array (
0 => 'Drama',
1 => 'Thriller',
)
array (
0 => 'DIY',
)
array (
0 => 'Drama',
1 => 'Mystery',
2 => 'Supernatural',
)
However, I need just one array which contains the unique values, such as:
array (
0 => 'Drama',
1 => 'Mystery',
2 => 'Supernatural',
4 => 'Thriller',
5 => 'DIY',
6 => 'Crime',
7 => 'etc...'
)
If I try to create some array before the foreach loop and then store the data into it, such approach doesn't give a result as well.
Perhaps, there is a more simple solution by the means of SQL!?!?

Answer 1

Please try this code
In SQL
$query = "SELECT show_genres FROM tv_shows GROUP BY show_genres";
In PHP
$newArray = array();
foreach ($result as $value) {
$sh_genres = $value['show_genres'];
$sh_genres_array = array_map('trim', explode(',',$sh_genres));
$newArray = array_merge($newArray , $sh_genres_array );
}
$newUniqueArray = array_unique($newArray);

Answer 2

try using this code
$link = mysqli_connect('127.0.0.1', 'root', 'pw', 'db');
$query = "SELECT show_genres FROM tv_shows";
$result = mysqli_query($link, $query);
$sh_genres_array = [];
foreach ($result as $value) {
$sh_genres = $value['show_genres'];
$sh_genres_array = array_merge(
$sh_genres_array ,
array_map('trim', explode(',',$sh_genres))
);
}
echo '<pre>' . var_export(array_unique($sh_genres_array), true) . '</pre>';
Update
Please consider normalizing your database

Answer 3

Not sure but try this.
$genre_arr = RecursiveIteratorIterator(new RecursiveArrayIterator($sh_genres_array));
$unique_genre = array_unique($genre_arr);