php图片验证码代码

session_start();
session_register('safecode');
$type = 'gif';
$width= 40;
$height= 16;
header("content-type: image/".$type);
srand((double)microtime()*1000000);
$randval = randstr(4,"");
if($type!='gif' && function_exists('imagecreatetruecolor')){
     $im = @imagecreatetruecolor($width,$height);
}else{
     $im = @imagecreate($width,$height);
}
     $r = array(225,211,255,223);
     $g = array(225,236,237,215);
     $b = array(225,236,166,125);

     $key = rand(0,3);
 
     $backcolor = imagecolorallocate($im,$r[$key],$g[$key],$b[$key]);//背景色（随机）
     $bordercolor = imagecolorallocate($im, 0, 0, 0);//边框色
     $pointcolor = imagecolorallocate($im, 255, 170, 255);//点颜色

     @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backcolor);//背景位置
     @imagerectangle($im, 0, 0, $width-1, $height-1, $bordercolor); //边框位置
     $stringcolor = imagecolorallocate($im, 255,51,153);

     for($i=0;$i<=100;$i++){
           $pointx = rand(2,$width-2);
           $pointy = rand(2,$height-2);
           @imagesetpixel($im, $pointx, $pointy, $pointcolor);
     }

     @imagestring($im, 3, 5, 1, $randval, $stringcolor);
     $imagefun='image'.$type;
     $imagefun($im);
     @imagedestroy($im);
     $_session['safecode'] = $randval;
//产生随机字符串
function randstr($len=6,$format='all') {
           switch($format) {
                 case 'all':
                 $chars='abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789www.111cn.net'; break;
                 case 'char':
                 $chars='abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'; break;
                 case 'number':
                 $chars='0123456789'; break;
                 default :
                 $chars='abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789';
                 break;
           }
     $string="";
     while(strlen($string)<$len)
     $string.=substr($chars,(mt_rand()%strlen($chars)),1);
     return $string;
}

//调用此页面，如果下面的式子成立，则生成验证码图片
if($_get["action"]=="verifycode")
{
    rand_create();
}
//验证码图片生成
function rand_create()
{
    //通知浏览器将要输出png图片
    header("content-type: image/png");
    //准备好随机数发生器种子 
    srand((double)microtime()*1000000);
    //准备图片的相关参数  
    $im = imagecreate(62,20);
    $black = imagecolorallocate($im, 0,0,0);  //rgb黑色标识符
    $white = imagecolorallocate($im, 255,255,255); //rgb白色标识符
    $gray = imagecolorallocate($im, 200,200,200); //rgb灰色标识符
    //开始作图    
    imagefill($im,0,0,$gray);
    while(($randval=rand()%100000)<10000);{
        $_session["login_check_num"] = $randval;
        //将四位整数验证码绘入图片 
        imagestring($im, 5, 10, 3, $randval, $black);
    }
    //加入干扰象素   
    for($i=0;$i<200;$i++){
        $randcolor = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
    }
    //输出验证图片
    imagepng($im);
    //销毁图像标识符
    imagedestroy($im);
}
//检验验证码
function rand_check()
{
    if($_post["reg_rand"] == $_session["login_check_num"]){
        return true;
    }
    else{
        exit("验证码输入错误");
    }
}

function str2pic ($string,$source,$destination="",$f,$fontsize=10,$shadowcolor="#ffffff",$f,$x=10,$y=10) {  
 //header('content-type:image/png');
    $pi=pathinfo($source);
    $pie=$pi[extension];#获取扩展名
    if(eregi("jpg|jpeg",$pie))$im=@imagecreatefromjpeg($source);
    if(eregi("gif",$pie))$im=@imagecreatefromgif($source);
    if(eregi("png",$pie))$im=@imagecreatefrompng($source);
    $col1=hex2dec($shadowcolor);#阴影颜色
    $col2=hex2dec($fontcolor);#字体颜色
    $col1=imagecolorallocate($im,$col1[0],$col1[1],$col1[2]);
    $col2=imagecolorallocate($im,$col2[0],$col2[1],$col2[2]);
    imagettftext($im,$fontsize,0,$y+1,$x+1,$col1,$fonturl,$string);
    imagettftext($im,$fontsize,0,$y,$x,$col2,$fonturl,$string);
    imagejpeg($im);
    if($destination)imagejpeg($im,$destination);
    imagedestroy($im);
}

function hex2dec($hexcolror) {#十六进制颜色转换成10进制颜色
    preg_match_all("/([0-f]){2,2}/i",$hexcolror,$matches);
    if(count($matches[0])==3){
    $rr=hexdec($matches[0][0]);
    $gg=hexdec($matches[0][1]);
    $bb=hexdec($matches[0][2]);
    }
    return array($rr,$gg,$bb);
}
?>
<?php
str2pic("[url=http://www.111cn.net]www.111cn.net","winter.jpg","winter2.jpg","simhei.ttf",10,"ffffff","330099",10,10[/url]);
?>

//创建多种又区分的颜色
$red = imagecolorallocate($image,255,0,0);
$blue  = imagecolorallocate($image,0,0,255);
$yellow = imagecolorallocate($image,255,255,0);
$violet = imagecolorallocate($image,255,0,255);
$white = imagecolorallocate($image,255,255,255);
$black = imagecolorallocate($image,0,0,0);

//使用for循环创建3d效果底层效果
for($i=120;$i>100;$i--){
    imagefilledarc($image,100,$i,200,120,0,30,$red,img_arc_pie);//img_arc_pie注释如下：

    imagefilledarc($image,100,$i,200,120,30,80,$blue,img_arc_pie);
    imagefilledarc($image,100,$i,200,120,80,360,$yellow,img_arc_pie);
}
//bool imagefilledarc ( resource image, int cx, int cy, int w, int h, int s, int e, int color, int style )
//
//imagefilledarc() 在 image 所代表的图像中以 cx，cy（图像左上角为 0, 0）画一椭圆弧。如果成功则返回 true，失败则返回 false。w 和 h 分别指定了椭圆的宽和高，s 和 e 参数以角度指定了起始和结束点。style 可以是下列值按位或（or）后的值：
//
//img_arc_pie
//
//img_arc_chord
//
//img_arc_nofill
//
//img_arc_edged

//这个层是最上面一层的效果，这样立体效果就出来了！
    imagearc($image,100,100,200,120,0,360,$black);//添加一个黑色的边圈，这样3d效果看起来更加明显点
    imagefilledarc($image,100,100,200,120,0,30,$red,img_arc_pie);
    imagefilledarc($image,100,100,200,120,30,80,$blue,img_arc_pie);
    imagefilledarc($image,100,100,200,120,80,360,$yellow,img_arc_pie);

//添加百分比数据，当然此处必要的时候可以批量的进行一定的运算将输入输入到图片上
    $str = iconv ("gbk","utf-8","36%");//如果要输入中文需要此转换。example：占用：30%；
    imagettftext($image,10,360-15,100+70,115,$white,"simhei.ttf",$str);

imagejpeg($image);
imagedestroy($image);

session_start();
$im=imagecreatetruecolor(100,30);
//分配颜色
$bg=imagecolorallocate($im,0,0,0);
$textcolor=imagecolorallocate($im,255,255,255);
//在图片上划线
for($i=0;$i<3;$i++){

$te1 = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imageline($im,0,rand(0,15),100,rand(0,15),$te1);
}
//在图片上打印200个点
for($i=0;$i<200;$i++){

 imagesetpixel($im,rand()%100,rand()%30,$te1);
}
for($i=0;$i<4;$i++){
 //dechex()把十进制转换成十六进制
 $rand.= dechex(rand(1,15));
}
$_session[check_pic]=$rand;
imagestring($im,5,rand(3,70),rand(3,15),$rand,$textcolor);
header("content-type:image/jpeg");
imagejpeg($im);