<?php 
if(isset($_POST["sub"])){ 
$text=$_POST["text"]; 
$patten='^[0-9]*$'; 
if(!preg_match($patten,$text,$x)){ 
echo"<script>alert('用戶沒有輸入數(shù)字');</script>"; 
}else{ 
if($x<1){ 
$y=$x; 
echo "y=".$y."<br>"; 
}else if($x<10){ 
$y=2*$x-1; 
echo 
"y=".$y."<br>"; 
}else{ 
$y=3*$x-11; 
echo "y=".$y."<br>"; 
} 
} 
?> 
<html> 
<head> 
</head> 
<body> 
<form method='post'> 
請輸入信息:<input type="text"name="text"> 
<input type="submit"name="sub"value="提交"> 
</form> 
</body> 
</html>

<2>:

<html> 
<head> 
</head> 
<body> 
<form method='post'> 
注冊賬號:<input type="text"name="aNum"><br> 
登錄密碼:<input type="password"name="pwd"><br> 
重復(fù)密碼:<input type="password"name="rPwd"><br> 
郵箱地址:<input type="text"name="email"><br> 
手機號碼:<input type="text"name="tel"><br> 
<input type="submit"name="sub"value="注冊"> 
<?php 
if(isset($_POST["sub"])){ 
$aNum=$_POST["aNum"]; 
$pwd=$_POST["pwd"]; 
$rPwd=$_POST["rPwd"]; 
$email=$_POST["email"]; 
$tel=$_POST["tel"]; 
$patten1="^\w+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$";//驗證郵箱 
$patten2="[0-9]{11}";//11位數(shù)字組成，驗證手機號碼 
$patten3="[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*"http://驗證賬號 
if(!preg_match($patten3,$aNum)){ 
echo"<script>alert('賬號格式不對');</script>"; 
}else{ 
if($pwd.length<6){ 
echo"<script>alert('密碼格式不對');</script>"; 
}else{ 
if(!preg_match($patten,$email)){ 
echo"<script>alert('email格式不正確');</script>"; 
}else{ 
if(!preg_match($patten2,$tel)){ 
echo"<script>alert('手機號碼格式不正確');</script>"; 
}else{ 
if(strlen($pwd)!=strlen($rPwd)){ 
echo"<script>alert('兩次密碼不一致');</script>"; 
}else{ 
echo"用戶您好!您的賬號為:".$aNum.",密碼為:".$pwd.",郵箱為:". 
$email.",手機號碼為:".$tel; 
} 
} 
} 
} 
} 
?> 
</form> 
</body> 
</html>

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