分配查询值，以阵列和输出

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

通过$sliderImages->fetch()返回的数组的默认类型是PDO::FETCH_BOTH。每列都返回一个名字和数字索引。这就是为什么你看到每个图像两次。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。