php通过电子邮件从数据库中获取您的详细信息

<form method="post" action="reserv page.php">
enter  the email: <input type = "text"  name = "email"/>   
<input type = "submit"  name = "submit"  value="submit" />  
</form>
<?php  
mysql_connect("localhost","userName","password");
mysql_select_db("database_Name");
if(isset($_POST['submit']))
{
    $email = $_POST['email']; 
    //limit the query to one entry :)
    $q  = "SELECT * FROM tabe WHERE the_email  = '$email' LIMIT 1"; 
    $run = mysql_query($q );
    //check if email is registered
    if(mysql_num_rows($run)>0) 
    {
        //display filled up form
        while($row = mysql_fetch_array($run))
        { 
        ?>
        </br></br>
        <form action="payment.php" method="post" >
        First Name:<input name="fName" type="text" value="<?php echo $row[1];   ?>" />
        Last Name: <input name="lNamet" type="text" value="<?php echo $row[2];   ?>" />
        User Name: <input name="uName" type="text" value="<?php echo $row[3];   ?>"/>
        Email:     <input name="email" type="text" value="<?php echo $row[4];   ?>" />
        password:  <input name="pass" type="password" value="<?php echo $row[5];  ?>"/>  
        contact:   <input name="number" type="text" value="<?php echo $row[6];   ?>" />
        <input name="confirm" type="submit" value="Confirm" />
        </form>
        </br></br>
        <?php
        }
    }
    //display blank form
    else{
        ?>
        <form action="payment.php" method="post" >
        First Name:<input name="fName" type="text"  />
        Last Name: <input name="lNamet" type="text" />
        User Name: <input name="uName" type="text" />
        Email:     <input name="email" type="text"  />
        password:  <input name="pass" type="password" />  
        contact:   <input name="number" type="text"  />
        <input name="confirm" type="submit" value="Confirm" />
        </form>   
        <?php
    }
}
?>

您得到了两个表单，因为如果设置了$_POST['submit']，您将回显一个表单，然后不管什么都回显另一个表单。仅在未设置$_POST['submit']的情况下打印第二个表单。由于你的代码写得太差了，我只给你举个例子：

if(isset($_POST['submit'])){
    PRINT FETCHED FORM
}else{
    PRINT EMPTY FORM
}

然而，这不是"正确"的做法。人们实际做的是在一开始就让变量为null，然后在有请求的情况下用数据填充它们，并在文件中编写一个带有输入值的表单作为这些变量。