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

 $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.gaodaima.com';  <span style="color:transparent">来源gaodai#ma#com搞*代#码网</span>//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.gaodaima.com';  //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-600';  //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] waterImg_info[0] || $this->srcImg_info[1] 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); } } ?>