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

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，使用图北京一夜 歌词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]) {      ca 3:        $this->im = imagecreatefrompng($this->srcimg);        break 1;      ca 2:        $this->im = imagecreatefromjpeg($this->srcimg);        break 1;      ca 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 ($th守望的距离is->waterimg_info[2]) {      ca 3:        $this->water_im = imagecreatefrompng($this->waterimg);        break 1;      ca 2:        $this->water_im = imagecreatefromjpeg($this->waterimg);        break 1;      ca 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) {      ca 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;      ca 1:   //上左        $this->x = 0;        $this->y = 0;        break 1;      ca 2:   //上中        $this->x = ($this->srcimg_info[0]-$this->waterimg_info[0])/2;        $this->y = 0;        break 1;      ca 3:   //上右        $this->x = $this->srcimg_info[0]-$this->waterimg_info[0];        $this->y = 0;        break 1;      ca 4:   //中左        $this->x = 0;        $this->y = ($this->srcimg_info[1]-$this->waterimg_info[1])/2;        break 1;      ca 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;      ca 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;      ca 7:   //下左        $this->x = 0;        $this->y = $this->srcimg_info[1]-$this->waterimg_info[1];        break 1;      ca 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 = $this->s反问和设问的区别rcimg_info[1]-$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]);生源地写到市还是县    $fontheight = $this->fontsize;    $this->water_im = imagecreatetruecolor($w, $h);    imagealphablending($this->water_im,fal);    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,$离校申请书this->fontsize,0,0,$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();    }el {      $this->waterimginfo();      $this->waterimg();    }    switch ($this->srcimg_info[2]) {      ca 3:        imagepng($this->im,$this->srcimg);        break 1;      ca 2:        imagejpeg($this->im,$this->srcimg);        break 1;      ca 1:        imagegif($this->im,$this->srcimg);        break 1;      default:        die('添加水印失败！');        break;    }    imagedestroy($this->im);    imagedestroy($this->water_im);  }}?>

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