Question

我不确定为什么这不起作用，它没有给我任何错误，但它不会显示结果。我只想显示3个文本字段的结果。我想要做的下一步是将数据输入数据库，然后显示它，但我想接下来会这样。谢谢。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<?php
$Fname = $_POST["Fname"];
$Lname = $_POST["Lname"];
$Pword = $_POST["Pword"];

if (!isset($_POST['submit'])) { // if page is not

?>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
</head>

<body>

<form method = "post" action = "<?php echo $PHP_SELF;?>">

First name<input name="Fname" type="text" maxlength="12"
/>
<br />
<br />

Last name<input name="Lname" type="text" maxlength="12"
/>
<br />
<br />

<!--Address <input name="register_address" type="text" maxlength="12"
/>
<br />
 <br />-->
<!--<select name="state" value="State"></select>-->


Password<input name="Pword" type="text" maxlength="12"
/>
<br />
<br />

<!--Re-type Password<input name="register_password_confirm" type="text" maxlength="12"
/>
<br />
<br />-->

<input name="submit" type="button" value="Submit" />



</form>

<?
} else {
echo "Hello, ".$Fname." ".$Lname.".<br />";
echo "Your Password is, " .$Pword.".<br />";
}
?>




</body>
</html>

Answer 1

我看到的三个问题

1 - 您的按钮不是提交按钮

变化：

<input name="submit" type="button" value="Submit" />

到

<input name="submit" type="submit" value="Submit" />

2 - 注册全局变量可能已关闭

变化：

<?php echo $PHP_SELF;?>

到

<?php echo $_SERVER['PHP_SELF'];?>

3 - 可能会关闭短暂打开的标签

变化：

<?
} else {
echo "Hello, ".$Fname." ".$Lname.".<br />";
echo "Your Password is, " .$Pword.".<br />";
}
?>

到

<?php
} else {
echo "Hello, ".$Fname." ".$Lname.".<br />";
echo "Your Password is, " .$Pword.".<br />";
}
?>

Answer 2

您的提交按钮需要更改为type="submit"，您也可以在else语句中移动变量声明以避免PHP警告：

<input name="submit" type="submit" value="Submit" />

和

<?php
} else {
    $Fname = $_POST["Fname"];
    $Lname = $_POST["Lname"];
    $Pword = $_POST["Pword"];
    echo "Hello, ".$Fname." ".$Lname.".<br />";
    echo "Your Password is, " .$Pword.".<br />";
}
?>

最后，我会将if语句中的html数量减少到最低限度，如果您将来更改条件的处理方式，这可能会导致冲突：

<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Untitled Document</title>
    </head>
    <body>

    <?php
    if (!isset($_POST['submit'])) { // if page is not
        ?>
        <form method = "post" action = "<?php echo $_SERVER['PHP_SELF'];?>">
            First name<input name="Fname" type="text" maxlength="12" /><br /><br />
            Last name<input name="Lname" type="text" maxlength="12" /><br /><br />
            <!--Address <input name="register_address" type="text" maxlength="12" /> <br /> <br />-->
            <!--<select name="state" value="State"></select>-->
            Password<input name="Pword" type="text" maxlength="12" /><br /><br />
            <!--Re-type Password<input name="register_password_confirm" type="text" maxlength="12" /><br /><br />-->
            <input name="submit" type="submit" value="Submit" />
        </form>
        <?php
    } else {
        $Fname = $_POST["Fname"];
        $Lname = $_POST["Lname"];
        $Pword = $_POST["Pword"];
        echo "Hello, ".$Fname." ".$Lname.".<br />";
        echo "Your Password is, " .$Pword.".<br />";
    }
    ?>
    </body>
</html>

Answer 3

尝试添加

<input type="hidden" name="submitted" value="1" />

并检查

$_POST['submitted'] == 1

Answer 4

尝试回显这样的结果：

echo "Hello, $Fname $Lname.<br />
      Your Password is, $Pword.<br />";

我忘了补充一点，当使用双引号回显时，你不需要变量之后的点。

为什么这个简单的注册页面不起作用？

4 个答案: