PHP Code ตัวอย่าง
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | <?phpsession_start();?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>php question verify</title></head> <body><?php$_SESSION['num_to_check'][0]=rand(1,9);$_SESSION['num_to_check'][1]=rand(1,9);?><form id="form1" name="form1" method="post" action=""> <div id="verify_math"> <span class="digital" style="background-position:<?=($_SESSION['num_to_check'][0]*-30)?>px 0px;"></span> <span>+</span> <span class="digital" style="background-position:<?=($_SESSION['num_to_check'][1]*-30)?>px 0px;"></span> <span>=</span> <span> <input name="i_verify" type="text" id="i_verify" maxlength="2" /></span></div><br /><br /><input type="submit" name="button2" id="button2" value="Submit" /></form> </body></html> |
CSS จัดการ Captcha
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | <style type="text/css">#verify_math{ display:block; height:21px; }#verify_math span{ display:block; height:21px; width:30px; position:relative; float:left; text-align:center; line-height:20px; color:#000;}#verify_math span.digital{ background:url(images/digi_img.jpg) left top no-repeat; }#i_verify{ position:relative; height:15px; width:35px; text-align:center; padding:0; margin:0; font-size:15px; font-weight:bold; font-family:Tahoma, Geneva, sans-serif;}</style> |
PHP Code หน้าตรวจสอบ
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <?phpsession_start();if($_POST['button2']){ if(isset($_POST['i_verify']) && $_POST['i_verify']==@array_sum($_SESSION['num_to_check']) && $_POST['i_verify']>0 && trim($_POST['i_verify'])!=""){ echo "<span style="color:green;">Right</span>"; $_SESSION['num_to_check'][0]=rand(1,9); $_SESSION['num_to_check'][1]=rand(1,9); exit; }else{ echo "<span style="color:red;">Wrong</span>"; $_SESSION['num_to_check'][0]=rand(1,9); $_SESSION['num_to_check'][1]=rand(1,9); exit; }}?> |
ตัวอย่าง
https://www.ninenik.com/demo/php_question_verify.php
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