PHP学习笔记（7）验证码优化

php代码，主要把RGB改成随机生成，不是之前固定的七种颜色了：

 <?php

    // ob_clean();

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

    $width = 110;

    $height = 40;

    $img = imagecreatetruecolor($width, $height);

    $string = "hello";

    //7种颜色，存入数组

    $red = imagecolorallocate($img, 255, 0, 0);

    $white = imagecolorallocate($img, 255, 255, 255);

    $green = imagecolorallocate($img, 0, 255, 0);

    $blue = imagecolorallocate($img, 0, 0, 255);

    $aaa = imagecolorallocate($img, 255, 255, 0);

    $bbb = imagecolorallocate($img, 0, 255, 255);

    $ccc = imagecolorallocate($img, 255, 0, 255);

    $colors = array($white,$red,$green,$blue,$aaa,$bbb,$ccc);

    //颜色换成随机组成的RGB，每次循环都生成一次

    $color = imagecolorallocate($img, rand(0,255), rand(0,255), rand(0,255));

    //画点

    for ($i=0; $i < 10; $i++) {

       $color1 = imagecolorallocate($img, rand(0,255), rand(0,255), rand(0,255));

       imagesetpixel($img, mt_rand(0,$width), mt_rand(0,$height), $color1);

    }

    //划线

    for ($i=0; $i < 4; $i++) {

       $color2 = imagecolorallocate($img, rand(0,255), rand(0,255), rand(0,255));

       imageline($img, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $color2);

    }

    //生成4位验证码

    $a1 = range(0, 9);

    $a2 = range(a, z);

    $a3 = range(A, Z);

    $a4 = array_merge($a1,$a2,$a3);

    //改用shuffle打断顺序，array_slice取出前4个字母数字。不然如果用mt_rand在循环中每次取一个，还要生成字符串，不好比对

    shuffle($a4);

    $a5 = array_slice($a4,0,4);

    $num = 4;

    $fontsize = 20;

    for ($i=0; $i < 4; $i++) {

       $color3 = imagecolorallocate($img, rand(0,255), rand(0,255), rand(0,255));

       imagettftext($img, $fontsize, mt_rand(-30,30), $width/$num*$i+5, 30, $color3, "Fonts/msyh.ttf", $a5[$i]);

    }

    imagepng($img);

  ?>

HTML代码（后缀也是php）：

 <!doctype html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>注册</title>

 </head>

 <body>

     <form action="test.php" method = "get">

         <table>

             <tr>

                 <td>用户名:</td>

                 <td><input type="text"><br/></td>

             </tr>

             <tr>

                 <td>密码:</td>

                 <td><input type="text"><br/></td>

             </tr>

             <tr>

                 <td>验证码:</td>

                 <td><input type="text" name = "txtYanZheng"><br/></td>

             </tr>

             <tr>

                 <td></td>

                 <td><img src="yanzhengma.php" id = "yanzhengma" ></form></td>

             </tr>

             <tr>

                 <td><input type="submit" value="提交" ></td>

             </tr>

         </table>

     <?php

     $var = '

     <script type="text/javascript">

     onload = function(){

         var yanzhengma = document.getElementById("yanzhengma");

         yanzhengma.onclick = function(){

             this.src = "yanzhengma.php?"+Math.random();

         };

     }

 </script>

 ';

     echo $var ?>

 </body>

 </html>

巴特西

PHP学习笔记（7）验证码优化

最新文章

热门文章