从数据库列获取唯一值（每个单元格都有逗号分隔的值）

Question

I'm trying to get unique values as list option from database column through foreach where each cell has multiple values seperated by comma.

Database cell:

1. Door, Window
2. Window, Sheet
3. Sheet, Door

I'm trying to get the following as the select option:

1. Door
2. Window
3. Sheet

I'm using laravel and and tryied the follwing:

My controller looks like:

$products = DB::table('dealers')->select('products')->distinct()->get();

My blade view looks like:

<select>
<option value="">All</option>
@foreach( $products as $product)
    <?php
    foreach(explode(", ", $product->products) as $value)

        printf(
            '<option value="%1$s">
                                    %1$s
                                </option>',
            $value
        );
    ?>
@endforeach

I'm getting the following output as: [1] Door [2] Window [3] Window [4] Sheet [5] Sheet [6] Door

Can anyone please help! I need to make it: [1] Door [2] Window [3] Sheet

Answer 1

PHP has a large standard library of array functions, including array_unique

EDIT

I missed the outer loop. You have to get unique-ness for the whole data set, not just per-row

$uniqueProducts = array_unique(array_merge(...array_map(function($row) {
   return explode(', ', trim($row));
}, $products));

Answer 2

Simple you can save each term in array. then check if not value exists in array. Try laravel blade view code below:

<select>
    <option value="">All</option>
    <?php $array = []; ?>
    @foreach( $products as $product)
        @foreach(explode(", ", $product->products) as $value)
            @if(!in_array($value, $array))
            <option value="{{ $value }}">{{ $value }}</option>
            @endif
        @endforeach
    @endforeach
</select>

Answer 3

这是为我工作的东西！