/**
* 图片水印
* @param string $source_img 原始图片url
* @param string $water_map 水印图片url
*/
function addWaterMap($source_img, $water_map,$left,$top)
{
list($dst_w, $dst_h, $dst_type) = getimagesize($source_img);
switch ($dst_type)
{
case 1:
$img = imagecreatefromgif($source_img);
break;
case 2:
$img = imagecreatefromjpeg($source_img);
break;
case 3:
$img = imagecreatefrompng($source_img);
break;
default:
return false;
break;
}
$img_x = imagesx($img); //原图宽
$img_y = imagesy($img); //原图高
imagealphablending($img, true);//设置为混合填色模式
list($map_w, $map_h, $map_type) = getimagesize($water_map);
switch ($map_type)
{
case 1:
$img_water_map = imagecreatefromgif($water_map);
break;
case 2:
$img_water_map = imagecreatefromjpeg($water_map);
break;
case 3:
$img_water_map = imagecreatefrompng($water_map);
break;
default:
return false;
break;
}
$water_x = imagesx($img_water_map); //水印宽
$water_y = imagesy($img_water_map); //水印高
$wimg_x = $left; //水印x坐标
$wimg_y = $top; //水印y坐标
imagecopy($img, $img_water_map, $wimg_x, $wimg_y, 0, 0, $water_x, $water_y); //分别为原图，水印，水印x坐标，水印y坐标，水印图片横轴开始点，水印图片纵轴开始点，水印横轴结束，水印纵轴结束
switch ($dst_type) {
case 1://GIF
imagegif($img,$source_img);
break;
case 2://JPG
imagejpeg($img,$source_img);
break;
case 3://PNG
imagepng($img,$source_img);
break;
default:
break;
}
imagedestroy($img); //销毁内存数据流
imagedestroy($img_water_map); //销毁内存数据流
}
/**
* 压缩图片
* @param $source_path 原图路径
* @param $target_path 保存路径
* @param $imgWidth 目标宽度
* @param $imgHeight 目标高度
* @return bool|string
*/
function resize_image($source_path,$target_path,$imgWidth,$imgHeight)
{
$source_info = getimagesize($source_path);
$source_mime = $source_info['mime'];
switch ($source_mime)
{
case 'image/gif':
$source_image = imagecreatefromgif($source_path);
$ext = ".gif";
break;
case 'image/jpeg':
$source_image = imagecreatefromjpeg($source_path);
$ext = ".jpg";
break;
case 'image/png':
$source_image = imagecreatefrompng($source_path);
$ext = ".png";
break;
}
$target_image = imagecreatetruecolor($imgWidth, $imgHeight); //创建一个彩色的底图
imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $imgWidth, $imgHeight, $source_info[0], $source_info[1]);
//保存图片到本地
$dir = $target_path. '/'. date("Ymd") . '/';
if (!is_dir($dir)) {
mkdir($dir, 0777);
}
$fileName = $dir.date("YmdHis").uniqid().$ext;
switch ($source_mime)
{
case 'image/gif'://GIF
$listen = imagegif($target_image,'./'.$fileName);
break;
case 'image/jpeg'://JPG
$listen = imagejpeg($target_image,'./'.$fileName);
break;
case 'image/png'://PNG
$listen = imagepng($target_image,'./'.$fileName);
break;
}
if($listen)
{
$fileName = '';
}
imagedestroy($target_image);
return $fileName;
}
/**
* 文字水印
* @param $dst_path 原图地址
* @param $fontSize 文字大小
* @param $left 文字左边位置
* @param $top 文字顶部位置
* @param $text 文本内容
* @param $circleSize 文本旋转角度
* @return bool|string
*/
function font_stamp($dst_path,$fontSize = 20,$left=0,$top=0,$text='',$circleSize = 0)
{
$img = imagecreatefromstring(file_get_contents($dst_path));
$font = dirname(__FILE__).'\xdct.ttf';//字体,字体文件需保存到相应文件夹下
$black = imagecolorallocate($img, 255, 255, 255);//字体颜色 RGB
imagefttext($img, $fontSize, $circleSize, $left, $top, $black, $font, $text);
list($bgWidth, $bgHight, $bgType) = getimagesize($dst_path);
switch($bgType){
case 1: //gif
header('Content-Type:image/gif');
imagegif($img);
break;
case 2: //jpg
header('Content-Type:image/jpg');
imagejpeg($img);
break;
case 3: //png
header('Content-Type:image/png');
imagepng($img); //在 images 目录下就会生成一个 circle.png 文件,上面也可设置相应的保存目录及文件名。
break;
}
imagedestroy($img);
}
$source = "poster.png";
$stamp = "watermark.png";
// addWaterMap($source,$stamp,0,0);
// $file = resize_image($source,"thumb",100,100);
// echo $file;
font_stamp($source,50,$left=10,$top=100,$text='我是文本内容我是文本内容我是文本内容');
?>