?php 
if(isset($_POST["sub"])){ 
$text=$_POST["text"]; 
$patten='^[0-9]*$'; 
if(!preg_match($patten,$text,$x)){ 
echo"script>alert('用户没有输入数字');/script>"; 
}else{ 
if($x1){ 
$y=$x; 
echo "y=".$y."br>"; 
}else if($x10){ 
$y=2*$x-1; 
echo 
"y=".$y."br>"; 
}else{ 
$y=3*$x-11; 
echo "y=".$y."br>"; 
} 
} 
?> 
html> 
head> 
/head> 
body> 
form method='post'> 
请输入信息:input type="text"name="text"> 
input type="submit"name="sub"value="提交"> 
/form> 
/body> 
/html> 

html> 
head> 
/head> 
body> 
form method='post'> 
注册账号:input type="text"name="aNum">br> 
登录密码:input type="password"name="pwd">br> 
重复密码:input type="password"name="rPwd">br> 
邮箱地址:input type="text"name="email">br> 
手机号码:input type="text"name="tel">br> 
input type="submit"name="sub"value="注册"> 
?php 
if(isset($_POST["sub"])){ 
$aNum=$_POST["aNum"]; 
$pwd=$_POST["pwd"]; 
$rPwd=$_POST["rPwd"]; 
$email=$_POST["email"]; 
$tel=$_POST["tel"]; 
$patten1="^\w+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$";//验证邮箱 
$patten2="[0-9]{11}";//11位数字组成，验证手机号码 
$patten3="[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*"//验证账号 
if(!preg_match($patten3,$aNum)){ 
echo"script>alert('账号格式不对');/script>"; 
}else{ 
if($pwd.length6){ 
echo"script>alert('密码格式不对');/script>"; 
}else{ 
if(!preg_match($patten,$email)){ 
echo"script>alert('email格式不正确');/script>"; 
}else{ 
if(!preg_match($patten2,$tel)){ 
echo"script>alert('手机号码格式不正确');/script>"; 
}else{ 
if(strlen($pwd)!=strlen($rPwd)){ 
echo"script>alert('两次密码不一致');/script>"; 
}else{ 
echo"用户您好!您的账号为:".$aNum.",密码为:".$pwd.",邮箱为:". 
$email.",手机号码为:".$tel; 
} 
} 
} 
} 
} 
?> 
/form> 
/body> 
/html>