php给图片加水印函数

function Watermark_IM($preview = 0) {
  global $watermarkstatus, $watermarktype, $watermarktrans, $watermarkquality, $watermarktext, $imageimpath;
  $watermarkstatus = $GLOBALS['forum']['disablewatermark'] ? 0 : $watermarkstatus;
  switch($watermarkstatus) {
   case 1:
    $gravity = 'NorthWest';
    break;
   case 2:
    $gravity = 'North';
    break;
   case 3:
    $gravity = 'NorthEast';
    break;
   case 4:
    $gravity = 'West';
    break;
   case 5:
    $gravity = 'Center';
    break;
   case 6:
    $gravity = 'East';
    break;
   case 7:
    $gravity = 'SouthWest';
    break;
   case 8:
    $gravity = 'South';
    break;
   case 9:
    $gravity = 'SouthEast';
    break;
  }
  $targetfile = !$preview ? $this->targetfile : DISCUZ_ROOT.'./forumdata/watermark_temp.jpg';
  if($watermarktype < 2) {
   $watermark_file = $watermarktype == 1 ? DISCUZ_ROOT.'./images/common/watermark.png' : DISCUZ_ROOT.'./images/common/watermark.gif';
   $exec_str = $imageimpath.'/composite'.
    ($watermarktype != 1 && $watermarktrans != '100' ? ' -watermark '.$watermarktrans.'%' : '').
    ' -quality '.$watermarkquality.
    ' -gravity '.$gravity.
    ' '.$watermark_file.' '.$this->targetfile.' '.$targetfile;
  } else {
   $watermarktextcvt = str_replace(array("n", "r", "'"), array('', '', '''), pack("H*", $watermarktext['text']));
   $watermarktext['angle'] = -$watermarktext['angle'];
   $translate = $watermarktext['translatex'] || $watermarktext['translatey'] ? ' translate '.$watermarktext['translatex'].','.$watermarktext['translatey'] : '';
   $skewX = $watermarktext['skewx'] ? ' skewX '.$watermarktext['skewx'] : '';
   $skewY = $watermarktext['skewy'] ? ' skewY '.$watermarktext['skewy'] : '';
   $exec_str = $imageimpath.'/convert'.
    ' -quality '.$watermarkquality.
    ' -font "'.$watermarktext['fontpath'].'"'.
    ' -pointsize '.$watermarktext['size'].
    (($watermarktext['shadowx'] || $watermarktext['shadowy']) && $watermarktext['shadowcolor'] ?
     ' -fill "rgb('.$watermarktext['shadowcolor'].')"'.
     ' -draw "'.
      ' gravity '.$gravity.$translate.$skewX.$skewY.
      ' rotate '.$watermarktext['angle'].
      ' text '.$watermarktext['shadowx'].','.$watermarktext['shadowy'].' ''.$watermarktextcvt.''"' : '').
    ' -fill "rgb('.$watermarktext['color'].')"'.
    ' -draw "'.
     ' gravity '.$gravity.$translate.$skewX.$skewY.
     ' rotate '.$watermarktext['angle'].
     ' text 0,0 ''.$watermarktextcvt.''"'.
    ' '.$this->targetfile.' '.$targetfile;
  }
  @exec($exec_str, $output, $return);
  if(empty($return) && empty($output)) {
   $this->attach['size'] = filesize($this->targetfile);
  }
 }
function Thumb_IM($thumbwidth, $thumbheight, $preview = 0) {
  global $thumbstatus, $imageimpath, $thumbquality;
  if($thumbstatus) {
   list($img_w, $img_h) = $this->attachinfo;
   $targetfile = !$preview ? ($thumbstatus == 1 || $thumbstatus == 3 ? $this->targetfile.'.thumb.jpg' : $this->targetfile) : DISCUZ_ROOT.'./forumdata/watermark_temp.jpg';
   if(!$this->animatedgif && ($img_w >= $thumbwidth || $img_h >= $thumbheight)) {
    if($thumbstatus != 3) {
     $exec_str = $imageimpath.'/convert -quality '.intval($thumbquality).' -geometry '.$thumbwidth.'x'.$thumbheight.' '.$this->targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     if(empty($return) && empty($output)) {
      $this->attach['thumb'] = $thumbstatus == 1 ? 1 : 0;
     }
    } else {
     $imgratio = $img_w / $img_h;
     $thumbratio = $thumbwidth / $thumbheight;
     if($imgratio >= 1 && $imgratio >= $thumbratio || $imgratio < 1 && $imgratio > $thumbratio) {
      $cuty = $img_h;
      $cutx = $cuty * $thumbratio;
     } elseif($imgratio >= 1 && $imgratio <= $thumbratio || $imgratio < 1 && $imgratio < $thumbratio) {
      $cutx = $img_w;
      $cuty = $cutx / $thumbratio;
     }
     $exec_str = $imageimpath.'/convert -crop '.$cutx.'x'.$cuty.'+0+0  '.$this->targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     $exec_str = $imageimpath.'/convert -quality '.intval($thumbquality).' -geometry '.$thumbwidth.'x'.$thumbheight.' '.$targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     if(empty($return) && empty($output)) {
      $this->attach['thumb'] = $thumbstatus == 1 || $thumbstatus == 3 ? 1 : 0;
     }
    }
             }
  }
 }

<?php php 验证码图片 程序
/*
*文件名:class.safeCode.php
*类名:safeCode
*目的:生成web应用时所需的验证码图片
*当前版本:1.0.2
*作者:NoAngels
*联系方式:flare_1023@163.com QQ:82535599 MSN:atizu@hotmail.com
*开发时间:2008年06月20日
*最后更新:2008年06月21日
*更新内容:
*版本1.0.2
*1.更新了对linux主机支持,设置GDFONTPATH环境变量,
* putenv('GDFONTPATH=' . realpath('.'));
*2.对不支持antialias函数的时候避免采用此方法,避免低版本的GD库
*版本1.0.1
*1.更新了绘制指定类型图片,支持类型有:png,jpeg,gif.默认为png(此效果最佳)
*2.优化了部分代码
*/
class safeCode{
        function __construct(){
                #设置默认safe安全保护码
                $this->__safe = substr(md5(time()), 0 , 4);
        }
        function __destruct(){
                #释放资源
                unset($this->__img, $this->__canvasWidth, $this->__canvasHeight, $this->__codeLength, $this->__spacePerChar, $this->__code, $this->__safe, $this->__background, $this->__borderColor, $this->__colors, $this->__font, $this->__sessionName);
        }
        function setCanvas($width = 200, $height = 60){
                #设置画布宽度以及高度.有默认值
                $this->__canvasWidth = $width;
                $this->__canvasHeight = $height;
                $this->__img = imagecreatetruecolor($width, $height);               
                return;
        }
        function setSafe($char){
                #设置安全码,不调用系统会自己设置
                $this->__safe = $char;
                return;
        }
        function setCodeLength($num = 8){
                #设置验证码长度
                $this->__codeLength = $num;
        }       
        function setFont($fontName){
                #设置绘图时所用的字体,字体文件必须与类文件同目录
                $this->__font = $fontName;
                return;
        }
        function setBackground($arg1 = 255, $arg2 = 255, $arg3 = 255){
                #设置背景颜色
                $this->__background = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
                return;
        }
        function setBorderColor($arg1 = 128, $arg2 = 128, $arg3 = 128){
                #设置边框颜色
                $this->__borderColor = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
        }
        function setFontColor($arr){
                #设置绘图时所用颜色,参数为颜色集合数组
                foreach($arr as $color){
                        $this->__colors[] = imagecolorallocate($this->__img, $color[0], $color[1], $color[2]);
                }
                return;
        }       
        function setSession($sessionName = 'safeCode'){
                #设置session变量名,默认为$_SESSION['safeCode']
                $this->__sessionName = $sessionName;
                #$_SESSION[$sessionName] = $this->__code;
                return;
        }
        function display($type = 'png'){
                #显示图片,可指定显示类型,目前支持png(默认),jpeg,gif
                $this->__setSpacePerChar();
                imagefilledrectangle($this->__img, 1, 1, $this->__canvasWidth - 2, $this->__canvasHeight -2, $this->__background);
                imagerectangle($this->__img, 0, 0, $this->__canvasWidth - 1, $this->__canvasHeight - 1, $this->__borderColor);
                $this->__drawText($this->__colors, $this->__getCode(), $this->__font);
                #修正linux以及低版本的GD库问题
                if(function_exists(imageantialias)){
                   imageantialias($this->__img, true);
                }
                $_SESSION[$this->__sessionName] = $this->__code;
                switch ($type){
                        case 'png':
                                header('Content-type:image/png');                               
                                imagepng($this->__img);       
                        case 'jpeg':
                                header('Content-type:image/jpeg');                               
                                imagejpeg($this->__img, '' , 75);
                        case 'gif':
                                header('Content-type:image/gif');                               
                                imagegif($this->__img);       
                        default:
                                header('Content-type:image/png');                               
                                imagepng($this->__img);                                                                                                               
                }
                imagegif($this->__img);       
        }       
        private function __setSpacePerChar(){
                #私有函数,设置字符间隔
                $this->__spacePerChar = $this->__canvasWidth / $this->__codeLength;
                return;
        }
        private function __getCode(){
                #获取验证码
                $this->__code = substr(md5(time().$this->__safe), rand(0, 24), $this->__codeLength);
                return $this->__code;
        }
        private function  __drawText($colors, $code, $fontName){
                #开始绘图
                #设置GBFONTPATH为当前目录,不然linux环境下会报错
                putenv('GDFONTPATH=' . realpath('.'));
                for($i = 0; $i < strlen($code); $i++){
                        $color = $colors[$i % count($colors)];
                        imagettftext(
                                $this->__img,
                                24 + rand(0, 8),
                                -20 + rand(0, 40),
                                ($i + 0.3) * $this->__spacePerChar,
                                $this->__canvasHeight - 20 + rand(0, 20),
                                $color,
                                $fontName,
                                $code{$i}
                        );
                }
                #绘制随机实线
                for($i = 0; $i < 400; $i++){
                        $x1 = rand(5, $this->__canvasWidth - 5);
                        $y1 = rand(5, $this->__canvasHeight - 5);
                        $x2 = $x1 - 4 + rand(0, 8);
                        $y2 = $y1 - 4 + rand(0, 8);
                        imageline($this->__img, $x1, $y1, $x2, $y2, $this->__colors[rand(0, count($this->__colors) - 1)]);
                }
                return;
        }
        private $__img = NULL;
        private $__canvasWidth = 120;
        private $__canvasHeight = 80;
        private $__codeLength = 8;
        private $__spacePerChar = 0;
        private $__code = 12345678;
        private $__safe = 2008;
        private $__background = NULL;
        private $__borderColor = NULL;       
        private $__colors = array();
        private $__font = 'arial.ttf';
        private $__sessionName = '';
}
?>

使用方法.

<?php
#测试文件
include_once('class.safeCode.php');
session_start();
$safeCode = new safeCode;
$safeCode->setCanvas(200, 50);
$safeCode->setCodeLength(8);
$safeCode->setSafe('2008');#设置安全码,不设置有默认值,动态生成
$safeCode->setBackground();
$safeCode->setBorderColor();
$safeCode->setFont('arial.ttf');#设置字体.必须同目录,字体文件
$colors = array(array(128, 64, 192), array(192, 64, 128), array(108, 192, 64));
$safeCode->setFontColor($colors);
$safeCode->setSession();
$safeCode->display('jpeg');

?>

php 生成验证码程序

<?php
$consts = 'bcdfghjkmnpqrstwxyz';
 $vowels = 'aei23456789';
 for ($x = 0; $x < 6; $x++)
 {
  $const[$x] = substr($consts, mt_rand(0,strlen($consts)-1),1);
  $vow[$x] = substr($vowels, mt_rand(0,strlen($vowels)-1),1);
 }
 $radomstring = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4];
 $_SESSION['checkcode'] = $string = substr($radomstring,0,4); //only display 4 str
 / t up image, the first number is the width and the second is the height
 $imageX = strlen($radomstring)*5.5; //the image width
 $imageY = 20;      //the image height
 $im = imagecreatetruecolor($imageX,$imageY);

 //creates two variables to store color
 $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250));
 $foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)),
         imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)),
         imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(0, 10)),
         imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(245, 255)));
 $foreground2 = imagecolorallocatealpha($im, rand(20, 100), rand(20, 100), rand(20, 100),80);  
 $middleground = imagecolorallocate($im, rand(200, 160), rand(200, 160), rand(200, 160));
 $middleground2 = imagecolorallocatealpha($im, rand(180, 140), rand(180, 140), rand(180, 140),80);

 //fill image with bgcolor
 imagefill($im, 0, 0, imagecolorallocate($im, 250, 253, 254));
 //writes string
 imagestring($im, 5, 3, floor(rand(0,5))-1, $string[0], $foregroundArr[rand(0,3)]);
 imagestring($im, 5, 13, floor(rand(0,5))-1, $string[1], $foregroundArr[rand(0,3)]);
 imagestring($im, 5, 23, floor(rand(0,5))-1, $string[2], $foregroundArr[rand(0,3)]);
 imagestring($im, 5, 33, floor(rand(0,5))-1, $string[3], $foregroundArr[rand(0,3)]);
 for($i=0; $i<strlen($string); $i++)
 {
  if(mt_rand(0,ord(substr($string,$i,1)))%2 == 0)
  {
   $string{$i} = ' ';
  }
 }
 imagestring($im, 2, 2, 0, $string, $foreground2);
 //strikethrough

 $border = imagecolorallocate($im, 133, 153, 193);
 //imagefilledrectangle($aimg, 0, 0, $x_size - 1, $y_size - 1, $back);
 imagerectangle($im, 0, 0, $imageX - 1, $imageY - 1, $border);

 $pointcol = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
 for ($i=0;$i<20;$i++)
 {
  imagesetpixel($im,rand(2,$imageX-2),rand(2,$imageX-2),$pointcol);
 }
 //rotate

 $middleground = imagecolorallocatealpha($im, rand(160, 200), rand(160, 200), rand(160, 200), 80);
 //random shapes
 for ($x=0; $x<15;$x++)
 {
  if(mt_rand(0,$x)%2==0)
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground);
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2);
  }
  else
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2);
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground);
  }
 }
 //output to browser
    header("content-type:image/png\r\n");
 imagepng($im);
 imagedestroy($im);
?>

php 图片 中文验证码

<img src="verify_image.php" alt="点此刷新验证码" name="verify_code" width="65" height="20" border="0" id="verify_code" ｏｎｃｌｉｃｋ="ｄｏｃｕｍｅｎｔ.ｇｅｔＥｌｅｍｅｎｔＢｙＩｄ('verify_code').src='verify_image.php?'+Ｍａｔｈ.ｒａｎｄｏｍ();" style="cursor:pointer;" />

<?php
session_start();

$vi = new vCodeImage;
$vi->SetImage(1,4,65,20,80,1);

class vCodeImage{
 var $mode;  //1：数字模式，2：字母模式，3：数字字母模式，其他：数字字母优化模式
 var $v_num;  //验证码个数
 var $img_w;  //验证码图像宽度
 var $img_h;  //验证码图像高度
 var $int_pixel_num;  //干扰像素个数
 var $int_line_num;  //干扰线条数
 var $font_dir;   //字体文件相对路径
 var $border;   //图像边框
 var $borderColor;  //图像边框颜色

 function SetImage($made,$v_num,$img_w,$img_h,$int_pixel_num,$int_line_num,$font_dir='../font',$border=true,$borderColor='255,200,85'){
  if(!isset($_SESSION['vCode'])){
   session_register('vCode');
  }
  $_SESSION['vCode']="";
 
  $this->mode = $made;
  $this->v_num = $v_num;
  $this->img_w = $img_w;
  $this->img_h = $img_h;
  $this->int_pixel_num = $int_pixel_num;
  $this->int_line_num = $int_line_num;
  $this->font_dir = $font_dir;
  $this->border = $border;
  $this->borderColor = $borderColor;
  $this->GenerateImage();
 }

 function GetChar($mode){
  if($mode == "1"){
   $ychar = "0,1,2,3,4,5,6,7,8,9";
  }
  else if($mode == "2"){
   $ychar = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
  }
  else if($mode == "3"){
   $ychar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
  }
  else
   $ychar = "3,4,5,6,7,8,9,A,B,C,D,H,K,P,R,S,T,W,X,Y";
  return $ychar;
 }
 
 function RandColor($rs,$re,$gs,$ge,$bs,$be){
  $r = mt_rand($rs,$re);
  $g = mt_rand($gs,$ge);
  $b = mt_rand($bs,$be);
  return array($r,$g,$b);
 }
 
 function GenerateImage(){
  $im = imagecreate($this->img_w,$this->img_h);

  $black = imagecolorallocate($im, 0,0,0);
  $white = imagecolorallocate($im, 255,255,255);
  $bgcolor = imagecolorallocate($im, 250,250,250);

  imagefill($im,0,0,$bgcolor);

  $fonts = ScanDir($this->font_dir);
  $fmax = count($fonts) - 2;

  $ychar = $this->GetChar($this->mode);
  $list = explode(",",$ychar);

  $x = mt_rand(2,$this->img_w/($this->v_num+2));
  $cmax = count($list) - 1;

  $v_code = '';

  for($i=0;$i<$this->v_num;$i++) //验证码
  {
   $randnum = mt_rand(0,$cmax);
   $this_char = $list[$randnum];
   $v_code .= $this_char;
   $size = mt_rand(intval($this->img_w/5),intval($this->img_w/4));
   $angle = mt_rand(-20,20);
   $y = mt_rand(($size+2),($this->img_h-2));
   if($this->border)
    $y = mt_rand(($size+3),($this->img_h-3));
   $rand_color = $this->RandColor(0,200,0,100,0,250);
   $randcolor = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   $fontrand = mt_rand(2, $fmax);
   $font = "$this->font_dir/".$fonts[$fontrand];
   imagettftext($im, $size, $angle, $x, $y, $randcolor, $font, $this_char);
   $x = $x + intval($this->img_w/($this->v_num+1));
  }

  for($i=0;$i<$this->int_pixel_num;$i++){//干扰像素
   $rand_color = $this->RandColor(50,250,0,250,50,250);
   $rand_color_pixel = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   imagesetpixel($im, mt_rand()%$this->img_w, mt_rand()%$this->img_h, $rand_color_pixel);
  }

  for($i=0;$i<$this->int_line_num;$i++){ //干扰线
   $rand_color = $this->RandColor(0,250,0,250,0,250);
   $rand_color_line = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   imageline($im, mt_rand(0,intval($this->img_w/3)), mt_rand(0,$this->img_h), mt_rand(intval($this->img_w - ($this->img_w/3)),$this->img_w), mt_rand(0,$this->img_h), $rand_color_line);
  }

  if($this->border) //画出边框
  {
   if(preg_match("/^\d{1,3},\d{1,3},\d{1,3}$/",$this->borderColor)){
    $borderColor = explode(',',$this->borderColor);
   }
   $border_color_line = imagecolorallocate($im,$borderColor[0],$borderColor[1],$borderColor[2]);
   imageline($im, 0, 0, $this->img_w, 0, $border_color_line); //上横
   imageline($im, 0, 0, 0, $this->img_h, $border_color_line); //左竖
   imageline($im, 0, $this->img_h-1, $this->img_w, $this->img_h-1, $border_color_line); //下横
   imageline($im, $this->img_w-1, 0, $this->img_w-1, $this->img_h, $border_color_line); //右竖
  }

  imageantialias($im,true); //抗锯齿

  $time = time();
  $_SESSION['vCode'] = $v_code."|".$time; //把验证码和生成时间负值给$_SESSION[vCode]

  //生成图像给浏览器
  if (function_exists("imagegif")) {
      header ("Content-type: image/gif");
      imagegif($im);
  }
  elseif (function_exists("imagepng")) {
      header ("Content-type: image/png");
      imagepng($im);
  }
  elseif (function_exists("imagejpeg")) {
      header ("Content-type: image/jpeg");
      imagejpeg($im, "", 80);
  }
  elseif (function_exists("imagewbmp")) {
      header ("Content-type: image/vnd.wap.wbmp");
      imagewbmp($im);
  }
  else
      die("No Image Support On This Server !");
 
  imagedestroy($im);
 }
}
?>