Paste_Image.png
注册页面
<?php
$string = "ABCDEFGHIJKLMNOPQRSJUVWXYZ1234567890";
$code = "";
for ($i = 1; $i <= 4; $i++) {
$code .= '<span style="color:rgb(' . mt_rand(0, 255) . ',' . mt_rand(0, 255) . ',' . mt_rand(0, 255) . ')">' . $string{mt_rand(0, strlen($string) - 1)} . '</span>';
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面</title>
</head>
<body>
<h1>慕课网注册页面</h1>
<form method="post" action="doAction.php">
<table border="1" cellspacing="0" cellpadding="0" width="80%" bgcolor="#ABCDEF">
<tr>
<td align="right">用户名</td>
<td><input type="username" id="" placeholder="请输入合法用户名...">用户名首字母以字母开始，并且长度6~10</td>
</tr>
<tr>
<td align="right">密码</td>
<td><input type="password" name="password" placeholder="请密码...">密码长度6~10</td>
</tr>
<tr>
<td align="right">确认密码</td>
<td><input type="password" name="password1" id="" placeholder="请输入确认密码...">两次密码一致</td>
</tr>
<tr>
<td align="right">邮箱</td>
<td><input type="text" name="email" id="" placeholder="请输入合法邮箱">邮箱必须包含@,382771946@qq.com</td>
</tr>
<tr>
<td align="right">兴趣爱好</td>
<td>
<input type="checkbox" name="fav[]" id="" value="php">PHP
<input type="checkbox" name="fav[]" id="" value="java">Java
<input type="checkbox" name="fav[]" id="" value="ios">Ios
<input type="checkbox" name="fav[]" id="" value="c">C语言
<input type="checkbox" name="fav[]" id="" value="c++">C++
<input type="checkbox" name="fav[]" id="" value="swift">Swift
<input type="checkbox" name="fav[]" id="" value="meteor">Meteor
<input type="checkbox" name="fav[]" id="" value="nodejs">NodeJS
<input type="checkbox" name="fav[]" id="" value="ionic">Iconic
</td>
</tr>
<tr>
<td align="right">验证码</td>
<td><input type="text" name="vertify"><?php echo $code ?></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="注册"></td>
</tr>
</table>
</form>
</body>
</html>
Paste_Image.png
ord 返回ASCII码
chr 返回指定的字符
Paste_Image.png
Paste_Image.png
$char = 'k';
echo ord($char);//107
echo "<br/>";
echo chr(ord($char));//k
substr 截取字符串
如果$start是负数 代表的是位置
<?php
$string = "abcdef";
echo substr($string, 0, 1) . "<br/>";//a
echo substr($string, 2, 2) . "<br/>";//cd
echo substr($string, 3) . "<br/>";//def
echo substr($string, -2) . "<br/>";//ef
echo substr($string, -4, 2) . "<br/>";//cd
echo substr($string, 0, -3) . "<br/>";//abc
echo substr($string, -4, -2);//cd
?>
doAction.php
<?php
header("content-type:text/html;charset=utf-8");
$username = $_POST['username'];
// $password=$_POST['password'];
// $password1=$_POST['password1'];
// $email=$_POST[email];
// $fav=$_POST['fav'];
// $verify=$_POST['verify'];
$redirectUrl = '<a href="reg.php" > 重新注册</a > ';
//$char = $username{0};
$char = substr($username, 0, 1);
$ascii = ord($char);
if (!(($ascii >= 65 && $ascii <= 90) || ($ascii >= 97 && $ascii <= 122))) {
exit('用户名首字母不是以字母开始' . $redirectUrl);
}
$userLen = strlen($username);
if ($userLen < 6 || $userLen > 10) {
exit('用户名长度不符合规范 <br/>' . $redirectUrl);
}
echo 'continue...';
?>
