Question

我只需要数组中一列的值。没有php我会使用“SELECT valueX FROM tableY”。这不适用于PHP。我只得到一个结果。这就是我所拥有的：

$salty = "SELECT salt FROM login";
$salts = mysqli_query($connection, $salty);
$validsalts = mysqli_fetch_array($salts);

Answer 1

您必须进行循环迭代才能获取所有值。

例如。

public static Bitmap ScaleImage(Image image, int maxWidth, int maxHeight)
{
    var ratioX = (double)maxWidth / image.Width;
    var ratioY = (double)maxHeight / image.Height;
    var ratio = Math.Min(ratioX, ratioY);

    var newWidth = (int)(image.Width * ratio);
    var newHeight = (int)(image.Height * ratio);

    Bitmap newImage = new Bitmap(newWidth, newHeight);
    using (Graphics gr = Graphics.FromImage(newImage))
    {
        gr.SmoothingMode = SmoothingMode.HighQuality;
        gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
        gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
        gr.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
     }
     return newImage;
}

我可以从php-array中的一列中选择值吗？

1 个答案: