php图片添加文字水印实现代码
http://my.oschina.net/zyt1978/blog/638426
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Php代码 <?php /*PHP图片加文字水印类库 QQ:3697578482 伤心的歌 该类库暂时只支持文字水印，位置为右下角，颜色随机 调用方法： 1、在需要加水印的文件顶部引入类库： include_once 'imageClass.php'; 2、声明新类： $tpl=new image_fu; 3、给图片水印提供参数： $tpl->img(图片路径,水印文字,字体路径,字体大小,字体角度); 比如：$tpl->img('abc.jpg','这是水印文字','ziti.ttf',30,0) */ class image_fu{ private $image ; private $img_info ; private $img_width ; private $img_height ; private $img_im ; private $img_text ; private $img_ttf = '' ; private $img_new ; private $img_text_size ; private $img_jd ; function img( $img = '' , $txt = '' , $ttf = '' , $size =12, $jiaodu =0){ if (isset( $img )&& file_exists ( $img )){ //检测图片是否存在 $this ->image = $img ; $this ->img_text= $txt ; $this ->img_text_size= $size ; $this ->img_jd= $jiaodu ; if ( file_exists ( $ttf )){ $this ->img_ttf= $ttf ; } else { exit ( '字体文件：' . $ttf . '不存在！' ); } $this ->imgyesno(); } else { exit ( '图片文件:' . $img . '不存在' ); } } private function imgyesno(){ $this ->img_info = getimagesize ( $this ->image); $this ->img_width = $this ->img_info[0]; //图片宽 $this ->img_height= $this ->img_info[1]; //图片高 //检测图片类型 switch ( $this ->img_info[2]){ case 1: $this ->img_im = imagecreatefromgif( $this ->image); break ; case 2: $this ->img_im = imagecreatefromjpeg( $this ->image); break ; case 3: $this ->img_im = imagecreatefrompng( $this ->image); break ; default : exit ( '图片格式不支持水印' ); } $this ->img_text(); } private function img_text(){ imagealphablending( $this ->img_im,true); //设定颜色 $color =imagecolorallocate( $this ->img_im,rand(0,255),rand(0,255),rand(0,255)); $txt_height = $this ->img_text_size; $txt_jiaodu = $this ->img_jd; $ttf_im =imagettfbbox( $txt_height , $txt_jiaodu , $this ->img_ttf, $this ->img_text); $w = $ttf_im [2] - $ttf_im [6]; $h = $ttf_im [3] - $ttf_im [7]; //$w = $ttf_im[7]; //$h = $ttf_im[8]; unset( $ttf_im ); $txt_y = $this ->img_height- $h ; $txt_x = $this ->img_width- $w ; //$txt_y =0; //$txt_x =0; $this ->img_new=@imagettftext( $this ->img_im, $txt_height , $txt_jiaodu , $txt_x , $txt_y , $color , $this ->img_ttf, $this ->img_text); @unlink( $this ->image); //删除图片 switch ( $this ->img_info[2]) { //取得背景图片的格式 case 1:imagegif( $this ->img_im, $this ->image); break ; case 2:imagejpeg( $this ->img_im, $this ->image); break ; case 3:imagepng( $this ->img_im, $this ->image); break ; default : exit ( '水印图片失败' ); } } //显示图片 function img_show(){ echo '<img src="' . $this ->image. '" border="0" alt="' . $this ->img_text. '" />' ;} //释放内存 private function img_nothing(){ unset( $this ->img_info); imagedestroy( $this ->img_im); } } ?> |
