将文字放在图片上,并合成图

PS:不知道起什么标题,程序员的痛

$bigImgPath = $_REQUEST['image'];//背景图
//$bigImgPath = '1.jpg';//背景图
$new_file = "../upload/";//上传路径
if($_REQUEST['content']){
$content = implode("\n",explode("<br/>",$_REQUEST['content']));//折行
$img = imagecreatefromstring(file_get_contents($bigImgPath));
imagesavealpha($img,true);//这里很重要 意思是不要丢了$sourePic图像的透明色;
$font = 'font.ttf';//字体
$black = imagecolorallocate($img, 0, 0, 0);//字体颜色 RGB
$fontSize = 18; //字体大小
$circleSize = 0; //旋转角度
$left = 50; //左边距
$top = 90; //顶边距
$content = wordwrap($content,18,"\n",true);//每18个字符换行
imagefttext($img, $fontSize, $circleSize, $left, $top, $black, $font, '"'.$content.'"');
list($bgWidth, $bgHight, $bgType) = getimagesize($bigImgPath);
header('Content-Type:image/jpg');
imagejpeg($img,$new_file.$_REQUEST['filename']);
return true;
}