PHP添加文字水印或图片水印的水印类完整源代码与使用示例
发布:smiling 来源: PHP粉丝网 添加日期:2021-11-13 11:32:01 浏览: 评论:0
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PHP实现的给图片添加水印功能,可添加文字水印或图片水印,使用文字水印时需要提供字体文件,使用图片水印时需要提供水印图片,水印图片不能比要添加水印的图片大,请使用背景透明的水印图片。
该水印类支持自定义水印位置、自定义水印大小和水印的透明度,字体水印可自定义颜色等,功能已相应完善。
完整源代码如下(注解中已给出使用示例):
- <?php
- /**
- * 图片加水印类,支持文字水印、透明度设置、自定义水印位置等。
- * 使用示例:
- * $obj = new WaterMask($imgFileName); //实例化对象
- * $obj->$waterType = 1; //类型:0为文字水印、1为图片水印
- * $obj->$transparent = 45; //水印透明度
- * $obj->$waterStr = 'www.jb51.net'; //水印文字
- * $obj->$fontSize = 18; //文字字体大小
- * $obj->$fontColor = array(255,255,255); //水印文字颜色(RGB)
- * $obj->$fontFile = 'AHGBold.ttf'; //字体文件
- * ……
- * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
- */
- class WaterMask{
- public $waterType = 0; //水印类型:0为文字水印、1为图片水印
- public $pos = 0; //水印位置
- public $transparent = 45; //水印透明度
- public $waterStr = 'www.jb51.net'; //水印文字
- public $fontSize = 18; //文字字体大小
- public $fontColor = array(255,255,255); //水印文字颜色(RGB)
- public $fontFile = 'AHGBold.ttf'; //字体文件
- public $waterImg = 'logo.png'; //水印图片
- private $srcImg = ''; //需要添加水印的图片
- private $im = ''; //图片句柄
- private $water_im = ''; //水印图片句柄
- private $srcImg_info = ''; //图片信息
- private $waterImg_info = ''; //水印图片信息
- private $str_w = ''; //水印文字宽度
- private $str_h = ''; //水印文字高度
- private $x = ''; //水印X坐标
- private $y = ''; //水印y坐标
- function __construct($img) { //析构函数
- $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在!');
- }
- private function imginfo() { //获取需要添加水印的图片的信息,并载入图片。
- $this->srcImg_info = getimagesize($this->srcImg);
- switch ($this->srcImg_info[2]) {
- case 3:
- $this->im = imagecreatefrompng($this->srcImg);
- break 1;
- case 2:
- $this->im = imagecreatefromjpeg($this->srcImg);
- break 1;
- case 1:
- $this->im = imagecreatefromgif($this->srcImg);
- break 1;
- default:
- die('原图片('.$this->srcImg.')格式不对,只支持PNG、JPEG、GIF。');
- }
- }
- private function waterimginfo() { //获取水印图片的信息,并载入图片。
- $this->waterImg_info = getimagesize($this->waterImg);
- switch ($this->waterImg_info[2]) {
- case 3:
- $this->water_im = imagecreatefrompng($this->waterImg);
- break 1;
- case 2:
- $this->water_im = imagecreatefromjpeg($this->waterImg);
- break 1;
- case 1:
- $this->water_im = imagecreatefromgif($this->waterImg);
- break 1;
- default:
- die('水印图片('.$this->srcImg.')格式不对,只支持PNG、JPEG、GIF。');
- }
- }
- private function waterpos() { //水印位置算法
- switch ($this->pos) {
- case 0: //随机位置
- $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
- $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
- break 1;
- case 1: //上左
- $this->x = 0;
- $this->y = 0;
- break 1;
- case 2: //上中
- $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
- $this->y = 0;
- break 1;
- case 3: //上右
- $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
- $this->y = 0;
- break 1;
- case 4: //中左
- $this->x = 0;
- $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
- break 1;
- case 5: //中中
- $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
- $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
- break 1;
- case 6: //中右
- $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
- $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
- break 1;
- case 7: //下左
- $this->x = 0;
- $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
- break 1;
- case 8: //下中
- $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
- $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
- break 1;
- default: //下右
- $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
- $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
- break 1;
- }
- }
- private function waterimg() {
- if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
- die('水印比原图大!');
- }
- $this->waterpos();
- $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
- imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
- $pct = $this->transparent;
- imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
- imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
- }
- private function waterstr() {
- $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
- $w = abs($rect[2]-$rect[6]);
- $h = abs($rect[3]-$rect[7]);
- $fontHeight = $this->fontSize;
- $this->water_im = imagecreatetruecolor($w, $h);
- imagealphablending($this->water_im,false);
- imagesavealpha($this->water_im,true);
- $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
- imagefill($this->water_im,0,0,$white_alpha);
- $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
- imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
- $this->waterImg_info = array(0=>$w,1=>$h);
- $this->waterimg();
- }
- function output() {
- $this->imginfo();
- if ($this->waterType == 0) {
- $this->waterstr();
- }else {
- $this->waterimginfo();
- $this->waterimg();
- }
- switch ($this->srcImg_info[2]) {
- case 3:
- imagepng($this->im,$this->srcImg);
- break 1;
- case 2:
- imagejpeg($this->im,$this->srcImg);
- break 1;
- case 1:
- imagegif($this->im,$this->srcImg);
- break 1;
- default:
- die('添加水印失败!');
- break;
- }
- imagedestroy($this->im);
- imagedestroy($this->water_im);
- }
- }
- ?>
Tags: PHP添加水印 PHP水印源代码
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