function overlayjpg($imgsrc,$imgdst,$width,$height="") - {
- //$imgsrc jpg格式图像路径 $imgdst jpg格式图像保存文件名 $imgwidth要改变的宽度 $imgheight要改变的高度
- //取得图片的宽度,高度值
- $arr = getimagesize($imgsrc);
- //计算图片X轴位置
- $img_X = ($width - $arr[0])/2;
- if($height == ""){
- $heights = $arr[1];
- $img_Y = 0;
- }
- else{
- if($height <= $arr[1]){
- $heights = $arr[1];
- $img_Y = 0;
- }
- else{
- $heights = $height;
- $img_Y = ($height - $arr[1])/2;
- }
- }
//$w = $arr[0]; - //$h = $arr[1];
- // Create image and define colors
- $image = imagecreatetruecolor($width,$heights); //创建一个彩色的底图
- $bg = imagecolorallocate($image, 255, 255, 255);
- imagefill($image,0,0,$bg);
- $imgsrc = LoadIMG($imgsrc,$arr['mime']);
- imagecopy($image,$imgsrc,$img_X,$img_Y,0,0,$arr[0],$arr[1]);
- imagejpeg($image,$imgdst,90);
- //imagedestroy($image);
- }
- // 加载背景图片
- function LoadIMG($imgname,$mime)
- {
- if($mime == "image/gif"){
- $im = @imagecreatefromgif($imgname); /* Attempt to open */
- }
- elseif ($mime == "image/png"){
- $im = @imagecreatefrompng($imgname); /* Attempt to open */
- }
- else{
- $im = @imagecreatefromjpeg($imgname); /* Attempt to open */
- }
- if(!$im) { /* See if it failed */
- $im = imagecreatetruecolor(150, 30); /* Create a blank image */
- $bgc = imagecolorallocate($im, 255, 255, 255);
- $tc = imagecolorallocate($im, 0, 0, 0);
- imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
- /* Output an errmsg */
- imagestring($im, 1, 5, 5, "Error loading $imgname", $tc);
- }
- return $im;
- }
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