isset值始终返回1 [英] isset value always returns 1
问题描述
关于PHP,我是一个新手.我正在尝试制作一个登录和注销网页.现在,我创建了一个页面,该页面将添加记录.我的代码始终从我构建的表单中返回1,而不考虑表单中的值. 我的代码-
I am a newbie when it comes to PHP. I am trying to make a login and logout webpage. Now, I have created a page which would add records. MY code always returns 1 from the form that i built, irrespective of the value in the form. My code-
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$alpha = isset($_GET["username"]);
$beta = isset($_GET["password"]);
$gama = isset($_GET["hobby"]);
// Create connection
$conn = mysqli_connect("localhost","root" ,"","member");
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "INSERT INTO data (username,password,hobby)
VALUES ($alpha, $beta, $gama)";
if ($conn->query($sql)=== TRUE) {
echo $alpha."Your record is added into our database ";
} else {
echo $sql.$conn->error;
}
?>
这是我的表格:
<form action="add.php">
<table>
<tr>
<td>Username :</td> <td><input type="text" name="username"></td>
</tr>
<tr>
<td>Password :</td> <td><input type="text" name="username"></td>
</tr>
<tr>
<td>Hobbies:</td> <td><textarea name="hobby" id="hobby" cols="22" rows="7"></textarea></td>
</tr>
<tr>
<td> </td><td><input type="submit" name="submit"></td>
</tr>
</table>
</form>
推荐答案
发生这种情况是因为isset()
返回布尔值.
It happens because isset()
returns a boolean value.
如果您想直接打印username
字段,则可以:
If you want to directly print the username
field you can just:
if(isset($_GET["username"])) {
echo $_GET["username"];
}
因此,您应该了解变量$alpha
,$beta
,$gamma
并不包含您期望的实际字符串,而是一个布尔值
So you should understand that the variables $alpha
, $beta
, $gamma
do not hold the actual string you expect but a boolean value
查看更多信息: http://php.net/manual/zh/function .isset.php
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