本文章介紹一下關于在php中驗證碼程序的生成代碼,調用方法及以如果驗證用戶輸入的驗證碼程序沒有問題.
create_code.php,代碼如下:
- <?php
- session_start();
- //生成驗證碼圖片
- header("Content-type: image/png");
- // 全數字
- $str = "1,2,3,4,5,6,7,8,9,a,b,c,d,f,g"; //要顯示的字符,可自己進行增刪
- $list = explode(",", $str);
- $cmax = count($list) - 1;
- $verifyCode = '';
- for ( $i=0; $i < 5; $i++ ){
- $randnum = mt_rand(0, $cmax);
- $verifyCode .= $list[$randnum]; //取出字符,組合成為我們要的驗證碼字符
- }
- $_SESSION['code'] = $verifyCode; //將字符放入SESSION中
- $im = imagecreate(58,28); //生成圖片
- $black = imagecolorallocate($im, 0,0,0); //此條及以下三條為設置的顏色
- $white = imagecolorallocate($im, 255,255,255);
- $gray = imagecolorallocate($im, 200,200,200);
- $red = imagecolorallocate($im, 255, 0, 0);
- imagefill($im,0,0,$white); //給圖片填充顏色
- //將驗證碼繪入圖片
- imagestring($im, 5, 10, 8, $verifyCode, $black); //將驗證碼寫入到圖片中
- for($i=0;$i<50;$i++) //加入干擾象素
- {
- imagesetpixel($im, rand()p , rand()0 , $black); //加入點狀干擾素
- imagesetpixel($im, rand()p , rand()0 , $red);
- imagesetpixel($im, rand()p , rand()0 , $gray);
- //imagearc($im, rand()p, rand()p, 20, 20, 75, 170, $black); //加入弧線狀干擾素
- //imageline($im, rand()p, rand()p, rand()p, rand()p, $red); //加入線條狀干擾素
- }
- imagepng($im);
- imagedestroy($im);
- ?>
html代碼,demo.html代碼如下:
- <!-- DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd" -->
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <title></title>
- </head>
- <body>
- <form action="act.php" method="post">
- <input type="text" name="code" />
- <img id="code" src="create_code.php" alt="看不清楚,換一張" style="cursor: pointer; vertical-align:middle;" onClick="create_code()"/>
- <!--<button type="button" onClick="create_code()">更換</button>-->
- <button type="submit">提交</button>
- </form>
- <script>
- function create_code(){
- document.getElementByIdx_x('code').src = 'create_code.php?'+Math.random()*10000;
- }
- </script>
- </body>
- </html>
處理,判斷是否輸入正確 act.php,代碼如下:
- <?php
- session_start();
- if($_POST['code'] == $_SESSION['code']){
- echo 'ok';
- }else{
- echo 'no';
- }
- ?>
新聞熱點
疑難解答