How Can I Use a Column Value as the Index in My PDO Results?

Using Column Value as Index in Results with PDO

When working with SQL tables and PDO, you may encounter a need to have the result array indexed by a specific column value rather than an incrementing number. This allows for more efficient retrieval of data and can simplify certain operations.

To achieve this, you can utilize PDO's PDO::FETCH_UNIQUE fetching mode. When specifying this mode, the index of the resulting array will be based on the first field listed in the SELECT clause (or the first field in the table definition when using '*').

For example, consider a table called 'brands' containing the columns id, name, and url:

| id | name      | url       |
|-----|-----------|-----------|
| 1   | Solidfloor | solidfloor |
| 2   | Quickstep  | quickstep  |
| 4   | Cleanfloor | cleanfloor |

To fetch the data and use the id column as the array index:

$pdo = new PDO('...'); // PDO connection object
$data = $pdo->query('SELECT * FROM brands')->fetchAll(PDO::FETCH_UNIQUE);

The resulting $data array will be indexed by the id column, as follows:

[
    1 => [
        'name' => 'Solidfloor',
        'url' => 'solidfloor'
    ],
    2 => [
        'name' => 'Quickstep',
        'url' => 'quickstep'
    ],
    4 => [
        'name' => 'Cleanfloor',
        'url' => 'cleanfloor'
    ]
]

This allows you to access the data by the id column directly:

$brand = $data[1]; // Get brand with ID 1

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