昨天写了一个验证码的功能
1.首先生成验证码图片的界面
<?php session_start(); function random($len) { $srcstr = "1a2s3d4f5g6hj8k9qwertyupzxcvbnm"; mt_srand(); $strs = ""; for ($i = 0; $i < $len; $i++) { $strs .= $srcstr[mt_rand(0, 30)]; } return $strs; } //随机生成的字符串 $str = random(4); //验证码图片的宽度 $width = 50; //验证码图片的高度 $height = 25; //声明需要创建的图层的图片格式 @ header("Content-Type:image/png"); //创建一个图层 $im = imagecreate($width, $height); //背景色 $back = imagecolorallocate($im, 0xFF, 0xFF, 0xFF); //模糊点颜色 $pix = imagecolorallocate($im, 187, 230, 247); //字体色 $font = imagecolorallocate($im, 41, 163, 238); //绘模糊作用的点 mt_srand(); for ($i = 0; $i < 1000; $i++) { imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pix); } //输出字符 imagestring($im, 5, 7, 5, $str, $font); //输出矩形 imagerectangle($im, 0, 0, $width -1, $height -1, $font); //输出图片 imagepng($im); imagedestroy($im); $str = md5($str); //选择 cookie //SetCookie("verification", $str, time() + 7200, "/"); //选择 Session $_SESSION["verification"] = $str;
2.test5界面显示验证码并且输入
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function changing(){
document.getElementById('checkpic').src="test4.php?"+Math.random();
}
</script>
</head>
<body>
<form method="post" action="test1.php">
<img id="checkpic" onclick="changing();" src='test4.php' />
<input type="text" name="code" id="code"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
3.验证码跳转阶段
<?php session_start(); $nam = $_POST['code']; $nam = md5($nam); //session_start(); if($_SESSION["verification"]==$nam){ echo "验证码正确"; }else{ echo "验证码错误"; echo $_SESSION["verification"],$nam; }