如何从特定列中获取csv字符串

Question

列src是这样的：imga.jpgimgb.jpgimgc.jpg我需要得到两个变量：$firstimg = 'imga.jpg';$images = 'imga.jpg,imgb.jpg,imgc.jpg';在我的尝试中没有问题$firstimg但无法获得$images$ids = '1,2,3';$st = $db->query("select src from images where id in (" . $ids . ") order by field (id, " . $ids . ")");$images = $st->fetchAll(PDO::FETCH_ASSOC);$firstimg = $images[0]['src'];$images = implode(',', $images['src']);  // error - undefined index `src`

Answer 1

因为你有数组src：[["src" => "imga.jpg"], ["src" => "imgb.jpg"]...]

你可以这样做：

$images = implode(',', array_column($images, 'src'));