首先，您必须裁剪图像以适应明信片。

根据您的图像，您需要做的是：

$sourceImage = './postcard-template.jpg';

$uploadedImage = '/path/to/image/hong-kong2.jpg'; // let's get hong kong as example

$mime = '';

$font = '/path/to/font/arial.ttf';

function CroppedThumbnail($source, $width, $height, &$mime) {

$data = getimagesize($source);

$sourceWidth = $data[0];

$sourceHeight = $data[1];

$mime = $data['mime'];

$image = imagecreatefromjpeg($source);

$sourceRatio = $sourceWidth/$sourceHeight;

if (($width/$height) > $sourceRatio) {

$newHeight = $width/$sourceRatio;

$newWidth = $width;

}

else {

$newWidth = $height*$sourceRatio;

$newHeight = $height;

}

$croppedImage = imagecreatetruecolor(round($newWidth), round($newHeight));

imagecopyresampled($croppedImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $sourceWidth, $sourceHeight);

$thumb = imagecreatetruecolor($width, $height);

imagecopyresampled($thumb, $croppedImage, 0, 0, (($newWidth/2)-($width/2)), (($newHeight/2)-($height/2)), $width, $height, $width, $height);

imagedestroy($croppedImage);

imagedestroy($image);

return $thumb;

}

// Create the cropped image first

$newThumb = CroppedThumbnail($uploadedImage,240,315, $mime);

switch($mime) {

case 'image/gif':

$image = imagecreatefromgif($sourceImage);

break;

case 'image/jpeg':

$image = imagecreatefromjpeg($sourceImage);

break;

case 'image/png':

$image = imagecreatefrompng($sourceImage);

break;

default:

// error or stop script

break;

}

$message = "this is some text\nsome other text\ntext text";

imagettftext($image, 21, 0, 320, 255, imagecolorallocate($image, 0, 0, 0), $font, $message);

imagecopy($image, $newThumb, 40, 40, 0, 0, 240, 315);

header('Content-Type: image/jpeg');

imagejpeg($image);

imagedestroy($image);

例如我使用这个图像(需要裁剪)：

那么它将输出：