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我有一个关于如何合并图像并将其保存在服务器上的问题。我从http://tympanus.net/codrops/2010/03/22/interactive-image-vamp-up-with-jquery-css3-and-php/获取这段代码，这是一个非常酷的教程，但最后一部分不要说如何在服务器上创建一个时间图像，因为人们将它发送给他们的朋友。

这是php代码：

<?php
$res = json_decode(stripslashes($_POST['jsondata']), true);
/* get data */
$count_images = count($res['images']);
/* the background image is the first one */
$background     = $res['images'][0]['src'];
$photo1         = imagecreatefromjpeg($background);
$foto1W         = imagesx($photo1);
$foto1H         = imagesy($photo1);
$photoFrameW    = $res['images'][0]['width'];
$photoFrameH    = $res['images'][0]['height'];
$photoFrame     = imagecreatetruecolor($photoFrameW,$photoFrameH);
imagecopyresampled($photoFrame, $photo1, 0, 0, 0, 0, $photoFrameW, $photoFrameH, $foto1W, $foto1H);

/* the other images */
for($i = 1; $i < $count_images; ++$i){
    $insert         = $res['images'][$i]['src'];
    $photoFrame2Rotation = (180-$res['images'][$i]['rotation']) + 180;

    $photo2         = imagecreatefrompng($insert);

    $foto2W         = imagesx($photo2);
    $foto2H         = imagesy($photo2);
    $photoFrame2W   = $res['images'][$i]['width'];
    $photoFrame2H   = $res['images'][$i]['height'];

    $photoFrame2TOP = $res['images'][$i]['top'];
    $photoFrame2LEFT= $res['images'][$i]['left'];

    $photoFrame2    = imagecreatetruecolor($photoFrame2W,$photoFrame2H);
    $trans_colour   = imagecolorallocatealpha($photoFrame2, 0, 0, 0, 127);
    imagefill($photoFrame2, 0, 0, $trans_colour);

    imagecopyresampled($photoFrame2, $photo2, 0, 0, 0, 0, $photoFrame2W, $photoFrame2H, $foto2W, $foto2H);

    $photoFrame2    = imagerotate($photoFrame2,$photoFrame2Rotation, -1,0);
    /*after rotating calculate the difference of new height/width with the one before*/
    $extraTop       =(imagesy($photoFrame2)-$photoFrame2H)/2;
    $extraLeft      =(imagesx($photoFrame2)-$photoFrame2W)/2;

    imagecopy($photoFrame, $photoFrame2,$photoFrame2LEFT-$extraLeft, $photoFrame2TOP-$extraTop, 0, 0, imagesx($photoFrame2), imagesy($photoFrame2));    
}
// Set the content type header - in this case image/jpeg
header('Content-type: image/jpeg');
imagejpeg($photoFrame, $targetfile); 
imagedestroy($photoFrame);

?>
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