php - 图片居中水印

Question

我需要在图像上添加水印。我已经使用此代码解决了问题，效果很好，但图像位于左/下角。如何设置水印居中于图片中心？

$img = 'test.jpg';
// Load the image where the logo will be embeded into
$image = imagecreatefromjpeg($img);


// Load the logo image
$logoImage = imagecreatefrompng("watermark.png");
imagealphablending($logoImage, true);

// Get dimensions
$imageWidth=imagesx($image);
$imageHeight=imagesy($image);

$logoWidth=imagesx($logoImage);
$logoHeight=imagesy($logoImage);     

// Paste the logo
imagecopy(
   // destination
   $image, 
   // source
   $logoImage, 
   // destination x and y 
   $imageWidth-$logoWidth, $imageHeight-$logoHeight,    
   // source x and y
   0, 0,
   // width and height of the area of the source to copy
   $logoWidth, $logoHeight);

// Set type of image and send the output
header("Content-type: image/png");
imagePng($image);

// Release memory
imageDestroy($image);
imageDestroy($imageLogo); 

Answer 1

替换

// destination x and y 
   $imageWidth-$logoWidth, $imageHeight-$logoHeight,

与

// destination x and y 
   ($imageWidth-$logoWidth)/2, ($imageHeight-$logoHeight)/2

,