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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> <meta name="format-detection" content="telephone=no" /> <title>登錄頁面實例展示</title> <link rel="stylesheet" type="text/css" href="/phpMyAdmin/login.css"/> </head> <body> <p> <span> <input type="text" name="code" id="code" class="pf_ipt_verify w230" placeholder="驗證碼" autocomplete="off" tabindex="3"/> <img src="/phpMyAdmin/code.php" onClick="this.src='/phpMyAdmin/code.php?nocache='+Math.random()" style="cursor:hand"> </span> </p> </body> </html>
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<?php
session_start();
Header("Content-type:image/PNG");
$im = imagecreate(150,45);
$back = imagecolorallocate($im, 245, 245, 245);
imagefill($im, 0,0, $back);
$vcodes = "";
for($i = 0; $i < 4; $i++){
$font = imagecolorallocate($im, rand(100, 255), rand(0, 100), rand(100, 255));
$authnum = rand(0, 9);
$vcodes .= $authnum;
imagestring($im, 5, 50 + $i * 10, 20, $authnum, $font);
}
$_SESSION['VCODE'] = $vcodes;
for($i=0;$i<200;$i++) {
$randcolor = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($im, rand()%150, rand()%150, $randcolor); //
}
imagepng($im);
imagedestroy($im);
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if(!$_POST['code']){
echo('驗證碼不能為空');
return;
}else if($_POST['code']!=$_SESSION['VCODE']){
echo('驗證碼不正確');
return;
}
