Returns an entire single column of a result set as an indexed array.

Note that this method will run the result set to the end.

Parameters

$index: The index of the column number to fetch.

Return value

array An indexed array, or an empty array if there is no result set.

Overrides StatementInterface::fetchCol

File

core/lib/Drupal/Core/Database/StatementPrefetchIterator.php, line 347

Class

StatementPrefetchIterator

An implementation of StatementInterface that prefetches all data.

Namespace

Drupal\Core\Database

Code

public function fetchCol($index = 0) {
    if (isset($this->columnNames[$index])) {
        $result = [];
        while ($row = $this->fetch(\PDO::FETCH_ASSOC)) {
            $result[] = $row[$this->columnNames[$index]];
        }
        return $result;
    }
    return [];
}

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