php 验证码程序(数字与字母)

$ch_str="你要生成中文验证码汉字";
$str=array();
for ($i=0;$i<strlen($ch_str);$i+=3)
{
    $str[]=$ch_str[$i].$ch_str[$i+1].$ch_str[$i+2];
}
//图片的长和高
$image_x=200;
$image_y=100;
$im = imagecreate($image_x,$image_y);
//这里取图片底色为白色
$bkg = imagecolorallocate($im,255,255,255);
//显示的字体样式,这个要把文件放到对应的目录中,如果你没有文件就去window的字体文件中找一个吧。
$fnt = "simfang.ttf";
//为图像分配一些颜色
$white=imagecolorallocate($im,234,185,95);
//在图片上画椭圆弧,指定下坐标点
imagearc($im, 150, 8, 20, 20, 75, 170, $white);
imagearc($im, 180, 7,50, 30, 75, 175, $white);
//在图片上画一条线段,指定下坐标点
imageline($im,20,20,180,30,$white);
imageline($im,20,18,170,50,$white);
imageline($im,25,50,80,50,$white);
//乱点的数量
$noise_num=3000;
$line_num=80;
//各种混乱字符的颜色
$rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
$noise_color=imagecolorallocate($im,0x00,0x00,0x00);
$font_color=imagecolorallocate($im,0x00,0x00,0x00);
for($i=0;$i<$noise_num;$i++)
{
    //在一个坐标点上画一个单一像素,这个点上面定义了，是黑色的。
    imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
}

for($i=0;$i<$line_num;$i++)
{
    $line_color=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    //在两个坐标点间画一条线，颜色在上面定义
    imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);   
}
$randnum=rand(0,count($str)-4);
//保持是偶数
if ($randnum%2)
{
    $randnum+=1;   
}
$str1=$str[$randnum].$str[$randnum+1];
for ($i=0;$i<2;$i++)
{
    imagettftext($im, rand(28,32), rand(0,70), rand(($image_x/4)*$i+$image_x/10,($image_x/4)*$i+$image_x/8), rand($image_y/2+$image_y/10,$image_y/2+$image_y/5), $font_color, $fnt, $str[$randnum+$i]);   
}
imagepng($im);
imagedestroy($im);

//生成中文验证码二
$str="中文汉字";
$image_x=110;
$image_y=110;
$im = imagecreate($image_x,$image_y);
$bkg = imagecolorallocate($im,255,255,255);
$fnt = "hb.ttf"; //显示的字体样式
$white=imagecolorallocate($im,234,185,95);
imagearc($im, 150, 8, 20, 20, 75, 170, $white);
imagearc($im, 180, 7,50, 30, 75, 175, $white);
imageline($im,20,20,180,30,$white);
imageline($im,20,18,170,50,$white);
imageline($im,25,50,80,50,$white);
$noise_num=3000;
$line_num=80;
imagecolorallocate($im,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
$noise_color=imagecolorallocate($im,0x00,0x00,0x00);
$font_color=imagecolorallocate($im,0x00,0x00,0x00);
$line_color=imagecolorallocate($im,0x00,0x00,0x00);
for($i=0;$i<$noise_num;$i++)
imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
for($i=0;$i<$line_num;$i++)
imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
$randnum=rand(0,strlen($str)-4);
if ($randnum%2)$randnum+=1;
$str1=substr($str,$randnum,4);
$str2 = iconv("gb2312","utf-8",$str1);//验证汉字在$str1里面

imagettftext($im, rand(28,32), rand(0,70), rand(25,27), rand(70,100), $font_color, $fnt, $str2);
imagepng($im);
imagedestroy($im);

//把汉字放在数组
/*
gd函数只接受utf8格式编码的文字，所以在写文字前首先要进行编码转换。php自带的iconv和mbstring库都可以完成这项工作
*/

$randcode=array('宠');
$codetable=array();
$fp=fopen("gb2312.txt","r");
while($line=fgets($fp))
    $codetable[hexdec(substr($line,0,6))]=substr($line,7,6);
fclose($fp); 

//gb2312转utf8
function gb2utf8($gbstr)
{
    global $codetable;
    if(trim($gbstr)=="")
        return $gbstr;
    $ret="";
    $utf8="";
    while($gbstr)
    {
        if(ord(substr($gbstr,0,1))>127)
        {
            $thisw=substr($gbstr,0,2);
            $gbstr=substr($gbstr,2,strlen($gbstr));
            $utf8="";
            @$utf8=u2utf8(hexdec($codetable[hexdec(bin2hex($thisw))-0x8080]));

            if($utf8!="")
            for($i=0;$i<strlen($utf8);$i+=3)
                $ret.=chr(substr($utf8,$i,3));
        }
        else
        {
            $ret.=substr($gbstr,0,1);
            $gbstr=substr($gbstr,1,strlen($gbstr));
        }
    }
    return $ret;
} 
 

//unicode转utf8
function u2utf8($c)
{
    $str="";
    if($c<0x80)
        $str.=$c;
    elseif($c<0x800)
    {
        $str.=(0xc0|$c>>6);
        $str.=(0x80|$c&0x3f);
    }
    elseif($c<0x10000)
    {
        $str.=(0xe0|$c>>12);
        $str.=(0x80|$c>>6&0x3f);
        $str.=(0x80|$c&0x3f);
    }
    elseif($c<0x200000)
    {
        $str.=(0xf0|$c>>18);
        $str.=(0x80|$c>>12&0x3f);

        $str.=(0x80|$c>>6&0x3f);
        $str.=(0x80|$c&0x3f);
    }
    return $str;
} 

//生成附加码
function create_excode($length)
{
 global $randcode;
    header("content-type: image/png");
 $image_x=$length*30;    //图片宽度
 $image_y=40;            //图片高度
    $noise_num=80*$length;   //杂点数量
    $line_num=$length-2;      //干扰线数量
 $image=imagecreate($image_x,$image_y);
 imagecolorallocate($image,0xff,0xff,0xff);                  //设定背景颜色
 $rectangle_color=imagecolorallocate($image,0xaa,0xaa,0xaa); //边框颜色
 $noise_color=imagecolorallocate($image,0x00,0x00,0x00);     //杂点颜色
 $font_color=imagecolorallocate($image,0x00,0x00,0x00);      //字体颜色
 $line_color=imagecolorallocate($image,0x33,0x33,0x33);      //干扰线颜色

 //加入杂点
    for($i=0;$i<$noise_num;$i++)
  imagesetpixel($image,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);

 $font_face="simkai.ttf";    //字体
    $x=2;
    $session_code='';
    for($i=0;$i<$length;$i++)
    {
        $code=$randcode[mt_rand(0,count($randcode)-1)];
     imagettftext($image,18,mt_rand(-6,6),$x,29,$font_color,$font_face,gb2utf8($code));
        $x+=30;
        $session_code.=$code;
    }
    @session_start();
    $_session['excode']=$session_code;  //把附加码的值放在session中

 
    //加入干扰线
    for($i=0;$i<$line_num;$i++)
     imageline($image,mt_rand(0,$image_x),mt_rand(0,$image_y),
                    mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
 imagerectangle($image,0,0,$image_x-1,$image_y-1,$rectangle_color);  //加个边框
 imagepng($image);
 imagedestroy($image);
}
create_excode(6);

　　imagefill([image], [start x point], [start y point], [color])

　　imagefill($newimg,0,0,$skyblue); 　

　imagepng($newimg);

　　imagedestroy($newimg); ?＞

＜? header ("content-type: image/png");

　　$newimg = imagecreate(250,250);

　　$skyblue = imagecolorallocate($newimg,136,193,255);

　　imagefill($newimg,0,0,$skyblue);

　　imagepng($newimg);

　　imagedestroy($newimg);

　　?＞ 　　

<?php教程

/**
 *  ecshop jpgraph图表类库
 *  ==============================================================
 *  利用开源的jpgraph库实现对各类型数据以图表，走势图的形式表现出来。
 *  ==============================================================
**/

class cls_jpgraph
{
 var $db = null;
 var $ydata = array();
 var $width = 350;
 var $height = 250;

 var $graph = ''; //图形对象
 var $piegraph = ''; //丙状图形

 var $lineplot = ''; //线性对象
 var $barpot = ''; //柱状对象
 var $gbplat = ''; //柱状组对象
 var $txt = '';  //文本对象
 var $p1 = '';  //丙状图对象

 var $scale = ''; //图表类型? (textlin,textlog,intlin)
 var $yscale = '';   // (log,)
 var $xgrid = false; //x轴网格显示
 var $ygrid = false; //y轴网格显示
 var $title = ''; //标题
 var $subtitle = ''; //子标题(一般为日期)
 var $xaxis = ''; //x轴名称
 var $yaxis = ''; //y轴名称

 /*margin position*/
 var $left = 0;
 var $right = 0;
 var $top = 0;
 var $bottom = 0;

 /**
 *构造函数
 */
 function cls_jpgraph($width=350,$height=250)
 {
  $this->width = $width;
  $this->height = $height;

  $this->graph = new graph($this->width,$this->height);

 }

 /**
 * 图表类库的构造函数
 *
 */
 /*
 function __construct($parms,$width,$height)
 {
  cls_jpgraph($parms,$width,$height);
 }
 */

 /*图片基本信息设置*/
 function set_jpgraph($scale='intlin',$title='',$subtitle='',$bgcolor='',$xaxis='',
               $yaxis='',$xgrid=false,$ygrid=false,$margin='') {

  $this->scale = $scale;
  $this->title = $title;
  $this->subtitle = $subtitle;
  $this->xaxis = $xaxis;
  $this->yaxis = $yaxis;
  $this->xgrid = $xgrid;
  $this->ygrid = $ygrid;

  if(!empty($scale)) {
   $this->graph->setscale($this->scale);
  }
  else {
  $this->graph->setscale('intlin');
  }
  $this->graph->xgrid->show($this->xgrid,$this->xgrid);
  $this->graph->ygrid->show($this->ygrid,$this->ygrid);

  if(!empty($bgcolor)) {
   $this->graph->setmargincolor($bgcolor);
  }

  /*如果手工设置了图片位置*/
  if(is_array($margin)) {
   while(list($key,$val) = each($margin)) {
    $this->$key = $val;
   }
   $this->graph->setmargin($this->left,$this->right,$this->top,$this->bottom);
  }

  if(!empty($this->title)) {
   $this->graph->title->set($this->title);
  }
  if(!empty($this->subtitle)) {
   $this->graph->subtitle->set($this->subtitle);
  }
  else {
   $this->graph->subtitle->set('('.date('y-m-d').')'); //默认子标题设置为当前日期
  }
  if(!empty($this->xaxis)) {
   $this->graph->xaxis->title->set($this->xaxis);
  }
  if(!empty($this->yaxis)) {
   $this->graph->yaxis->title->set($this->yaxis);
  }

 }

 /*创建线性关系图表(linear plot)*/
 function create_lineplot($parms,$color='black',$weight=1)
 {
  $this->ydata = $parms;
  $this->lineplot = new lineplot($this->ydata);
  $this->lineplot->setcolor($color);
  $this->lineplot->setweight($weight);

  return $this->lineplot;
 }

 /*创建柱状图表(bar pot)*/
 function create_barpot($parms,$color='black',$width='0')
 {
  $this->ydata = $parms;
  $this->barpot = new barplot($this->ydata);
  $this->barpot->setfillcolor($color);
  if(!empty($width)) {
   $this->barpot->setwidth($width);
  }

  return $this->barpot;
 }

 /*创建数据柱状图表组*/
 function create_bargroup($plotarr,$width='0.8')
 {
  $this->gbplot = new groupbarplot($plotarr);
  $this->gbplot->setwidth($width);

  return $this->gbplot;
 }

 /*创建文本内容*/
 function create_text($str,$postion='',$color='black')
 {
  $this->txt = new text($str);

  if(is_array($postion)) {
   while(list($key,$val) = each($postion)) {
    $this->$key = $val;
   }
   $this->txt->setpos($this->left,$this->top);
  }
  else {
   $this->txt->setpos(10,20);
  }
  $this->txt->setcolor($color);

  $this->graph->add($this->txt);
 }

 /*创建丙状图表*/
 function create_pie($parms,$title,$type='3d',$size='0.5',$center='0.5',$width='350',$height='250')
 {
  $this->width = $width;
  $this->height = $height;

  $this->piegraph = new piegraph(300,200);
  $this->piegraph->setshadow();

  $this->piegraph->title->set($title);

  if('3d' != $type) {
   $this->p1 = new pieplot($parms);
   $this->piegraph->add($this->p1);
  }
  else {
   $this->p1 = new pieplot3d($parms);
   $this->p1->setsize($size);
   $this->p1->setcenter($center);
//   $this->p1->setlegends($gdatelocale->getshortmonth());
   $this->piegraph->add($this->p1);
  }
  $this->piegraph->stroke();
 }

 function get_auth_code($length=4)
 {
  $spam = new antispam();
  $chars = $spam->rand($length);

  if( $spam->stroke() === false ) {
   return false;
  }

  return $chars;
 }

 /*完成图形创建并显示*/
 function display($obj)
 {
  $this->graph->add($obj);
  $this->graph->stroke();
 }
}

?>