php两款生成图形验证码的代码
验证码在php中是经常会用到了,下面我们为你提供了一些关于php验证码生成类与程序,直接复制下去就可以直接用的,下面看代码.
- <?php
- session_start();
- Header("Content-type: image/gif");
- class SecurityCode
- {
- private $codes = '';
- function __construct()
- {
- $code = '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';
- $codeArray = explode('-',$code);
- shuffle($codeArray);
- $this->codes = implode('',array_slice($codeArray,0,4));
- }
- public function CreateImg()
- {
- $_SESSION['check_pic'] = $this->codes;
- $img = imagecreate(70,25);
- imagecolorallocate($img,222,222,222);
- $testcolor1 = imagecolorallocate($img,255,0,0);
- $testcolor2 = imagecolorallocate($img,51,51,51);
- $testcolor3 = imagecolorallocate($img,0,0,255);
- $testcolor4 = imagecolorallocate($img,255,0,255);
- for ($i = 0; $i < 4; $i++)
- {
- imagestring($img,rand(5,6),8 + $i * 15,rand(2,8),$this->codes[$i],rand(1,4));
- }
- imagegif($img);
- }
- }
- $code = new SecurityCode();
- $code->CreateImg();
- $code = NULL;
- ?>
- //代码二
- <?
- session_start();
- for($i=0; $i<4; $i++){
- $rand.= dechex(rand(1,15));
- } //开源代码phpfensi.com
- $_SESSION[check_pic]=$rand;
- //echo $_SESSION[check_pic];
- // 设置图片大小">图片大小
- $im = imagecreatetruecolor(100,30);
- // 设置颜色
- $bg=imagecolorallocate($im,0,0,0);
- $te=imagecolorallocate($im,255,255,255);
- // 把字符串写在图像左上角
- imagestring($im,rand(5,6),rand(25,30),5,$rand,$te);
- // 输出图像
- header("Content-type:image/jpeg");
- imagejpeg($im);
- ?>