php - 将 PDO::fetchAll() 的结果转换为类似数组

Question

我有一个来自我的数据库的名字列表。

我正在尝试将 PDO::fetchAll() 函数的结果转换为类似字符串的结果：

“名称 1”、“名称 2”、“名称 3”等。

我不知道你是否明白我的意思。

谢谢大家的帮助！

Answer 1

the very fetchAll() manual page contains the code that lets you get 1-dimensional array which can be easily imploded

$result = $sth->fetchAll(PDO::FETCH_COLUMN, 0);

you could also use Mysql's group_concat() function to get the string already from SQL.

But it is critical to know the destination of the data.

Answer 2

发现这个，天知道在哪里，很久以前就完成了这个任务。我希望你觉得这对你有帮助：

 /**
  * Formats a line (passed as a fields  array) as CSV and returns the CSV as a string.
  * Adapted from http://us3.php.net/manual/en/function.fputcsv.php#87120
  */
function arrayToCsv( array &$fields, $delimiter = ';', $enclosure = '"', $encloseAll = false, $nullToMysqlNull = false ) {
    $delimiter_esc = preg_quote($delimiter, '/');
    $enclosure_esc = preg_quote($enclosure, '/');

    $output = array();
    foreach ( $fields as $field ) {
        if ($field === null && $nullToMysqlNull) {
            $output[] = 'NULL';
            continue;
        }

        // Enclose fields containing $delimiter, $enclosure or whitespace
        if ( $encloseAll || preg_match( "/(?:${delimiter_esc}|${enclosure_esc}|\s)/", $field ) ) {
            $output[] = $enclosure . str_replace($enclosure, $enclosure . $enclosure, $field) . $enclosure;
        }
        else {
            $output[] = $field;
        }
    }

    return implode( $delimiter, $output );
}