首页 / 网页编程 / PHP / php实现图片上传时添加文字和图片水印技巧

<?phpheader（"Content-Type:text/html;charset=utf-8"）;/** To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *///给图片添加水印Class Water{//开启水印private $watermark_on = "1"; public $water_img; //水印位置public $pos = 1; //压缩比public $pct = 80; //透明度public $quality = 80; public $text = "乐趣网zlblog.sinaapp.com"; public $size = 12; public $color = "#000000"; public $font = "font.ttf"; public function watermark（ $img,$pos="",$out_img="",$water_img="",$text="" ）{if（！$this->check（$img） || ！$this->watermark_on） return false; $water_img = $water_img ? $water_img : $this->water_img;//水印的开启状态$waterimg_on = $this->check（$water_img） ? 1 : 0;//判断是否在原图上操作$out_img = $out_img ? $out_img : $img;//判断水印的位置$pos = $pos ? $pos : $this->pos;//水印文字$text = $text ? $text : $this->text;$img_info = getimagesize（$img）;$img_w = $img_info[0];$img_h = $img_info[1];//判断水印图片的类型if（ $waterimg_on ）{$w_info = getimagesize（$water_img）;$w_w = $w_info[0];$w_h = $w_info[1];if （ $img_w < $w_w || $img_h < $w_h ） return false;switch （ $w_info[2] ）{case 1:$w_img = imagecreatefromgif（$water_img）;break;case 2:$w_img = imagecreatefromjpeg（$water_img）;break;case 3:$w_img = imagecreatefrompng（$water_img）;break;}}else{if（ empty（$text） || strlen（$this->color）！=7 ） return FALSE;$text_info = imagettfbbox（$this->size, 0, $this->font, $text）;$w_w = $text_info[2] - $text_info[6];$w_h = $text_info[3] - $text_info[7];} //建立原图资源 switch （ $img_info[2] ）{case 1:$res_img = imagecreatefromgif（$img）;break;case 2:$res_img = imagecreatefromjpeg（$img）;break;case 3:$res_img = imagecreatefrompng（$img）;break;}//确定水印的位置switch （ $pos ）{case 1:$x = $y =25;break;case 2:$x = （$img_w - $w_w）/2; $y = 25;break;case 3:$x = $img_w - $w_w;$y = 25;break;case 4:$x = 25;$y = （$img_h - $w_h）/2;break;case 5:$x = （$img_w - $w_w）/2; $y = （$img_h - $w_h）/2;break;case 6:$x = $img_w - $w_w;$y = （$img_h - $w_h）/2;break;case 7:$x = 25;$y = $img_h - $w_h;break;case 8:$x = （$img_w - $w_w）/2;$y = $img_h - $w_h;break;case 9:$x = $img_w - $w_w;$y = $img_h - $w_h;break;default :$x = mt_rand（25, $img_w - $w_w）;$y = mt_rand（25, $img_h - $w_h）;} //写入图片资源if（ $waterimg_on ）{imagecopymerge（$res_img, $w_img, $x, $y, 0, 0, $w_w, $w_h, $this->pct）; }else{$r = hexdec（substr（$this->color, 1,2））;$g = hexdec（substr（$this->color, 3,2））;$b = hexdec（substr（$this->color, 5,2））;$color = imagecolorallocate（$res_img, $r, $g, $b）;imagettftext（$res_img, $this->size, 0, $x, $y, $color, $this->font, $text）;} //生成图片类型switch （ $img_info[2] ）{case 1:imagecreatefromgif（$res_img,$out_img）;break;case 2://imagecreatefromjpeg（$res_img,$out_img）;imagejpeg（$res_img,$out_img）;break;case 3:imagejpeg（$res_img,$out_img）;break;}if（isset（$res_img）） imagedestroy （$res_img）;if（isset（$w_img））imagedestroy（$w_img）;return TRUE;}//验证图片是否存在private function check（$img）{$type = array（".jpg",".jpeg",".png",".gif"）;$img_type = strtolower（strrchr（$img, "."））;return extension_loaded（"gd"） && file_exists（$img） && in_array（$img_type, $type）;} }

<?php /** To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *///header（"Content-Type:text/html;charset=utf-8"）;include "water.class.php";$image = new Water（）;$image->watermark（"12.jpg",5）;//$image->watermark（"12.jpg",1）;

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