将查询值分配给数组和输出

Question

$batchImage = array();
    $i = 0;
    $sliderImages = $dbh->prepare("select image1, image2, image3, image4 from centres where centre_id = 1 ");
    $sliderImages -> execute();
    $images = $sliderImages -> fetch();
    /*$img_1= $images['image1'];
    $img_2 $images['image2'];
    $img_3 $images['image3'];
    $img_4 $images['image4'];*/
     foreach($images as $image)
     {
         $batchImage[$i] = $image;
         $i++;
     }
     foreach($batchImage as $im)
     {
         echo $im;
     }

Answer 1

$sliderImages->fetch()返回的默认数组类型为PDO::FETCH_BOTH。每个列都返回一个named和numeric索引。这就是为什么你要两次看到每张图片的原因。要获得数字索引，请使用PDO::FETCH_NUM。

$sliderImages = $dbh->prepare("select image1, image2, image3, image4 from centres where centre_id = 1 ");
$sliderImages->execute();
$batchImage = $sliderImages->fetch(PDO::FETCH_NUM);
foreach($batchImage as $im)
{
     echo $im;
}

您也可以使用PDO::FETCH_ASSOC来获取指定的索引。