我想复制 $friendname=$_POST['friendname'];
我想把这个页面的朋友名复制到下一个页面并在那里回显。问题是它是 showinh undefined vairable 。目标是将相同的朋友名值回显到下一页，即 form2.php 并在那里回显
<?php
include("config.php");
session_start();
$user=$_POST['username'];//username
$friendname=$_POST['friendname'];//friendname
$years=$_POST['years'];
$nickname=$_POST['nickname'];
$place=$_POST['place'];//username
$sql = "INSERT INTO data (username,friendname,years,nickname,place)
VALUES ('$user', '$friendname', '$years','$nickname','$place')";
if ($con->query($sql) === TRUE) {
$_POST['friendname']=$frnd;//username
header('location: ../form2.php');
} else {
echo "Error: " . $sql . "<br>" . $con->error;
}
$con->close();
?>
这是我尝试过但不起作用 insert.php
<?php
include("config.php");
session_start();
$user=$_POST['username'];//username
$friendname=$_POST['friendname'];//friendname
$years=$_POST['years']
$nickname=$_POST['nickname'];
$place=$_POST['place'];
$sql = "INSERT INTO data (username,friendname,years,nickname,place)
VALUES ('$user', '$friendname', '$years','$nickname','$place')";
if ($con->query($sql) === TRUE) {
$_POST['friendname']=$frnd;//username
header('location: ../form2.php');
} else {
echo "Error: " . $sql . "<br>" . $con->error;
}
$con->close();
?>
表单2.php
<?php
session_start();
if (!isset($_SESSION['username'])) {
}
if (isset($_GET['logout'])) {
}
?>
<html>
<body>
<p><?php echo $_SESSION['username']; ?></p>
<h4>Enter some details for your friend <?php echo $frnd;?></h4>
<form>
</form>
</body>
</html>
注意：行号上的未定义索引变量 frnd
慕尼黑56888552回答
-
Cats萌萌
文件2.php<?phpsession_start();$frnd = $_SESSION['friendname'];?><html> <body> <p><?php echo $_SESSION['username']; ?></p> <h4>Enter some details for your friend <?php echo $frnd;?></h4> <form> </form> </body></html> -
摇曳的蔷薇
上述代码中的 sql 对 sql 注入是开放的——你应该考虑使用prepared statementsas，一旦掌握，将使生活更简单，你的代码更安全。以下内容未经测试，但基本上按如下方式工作：POST 请求数据被过滤 - 尽管在使用准备好的语句时这不是绝对必要的，但 IMO 总是一个好主意。sqlprepared用于执行，?sql 中的占位符绑定到变量。<?php session_start(); include 'config.php'; $user=filter_input( INPUT_POST, 'username', FILTER_SANITIZE_STRING ); $name=filter_input( INPUT_POST, 'friendname', FILTER_SANITIZE_STRING ); $years=filter_input( INPUT_POST, 'years', FILTER_SANITIZE_NUMBER_INT ); $nick=filter_input( INPUT_POST, 'nickname', FILTER_SANITIZE_STRING ); $place=filter_input( INPUT_POST, 'place', FILTER_SANITIZE_STRING ); $sql='insert into `data` (`username`,`friendname`,`years`,`nickname`,`place`) values (?,?,?,?,?)'; $stmt=$con->prepare( $sql ); if( !$stmt )exit('Failed to prepare SQL query'); $stmt->bind_param('ssiss',$user,$name,$years,$nick,$place); $res=$stmt->execute(); if( $res && $con->affected_rows==1 ){ $_SESSION['friendname']=$name; $_SESSION['username']=$user; exit( header('Location: ../form2.php') ); } else { exit('Error'); }?>然后你可以像这样修改你的 HTML 以将会话变量分配给一个变量 - 虽然再次不是绝对必要的<?php session_start(); $friend = $_SESSION['friendname'];?><html> <body> <form> <p><?php echo $_SESSION['username']; ?></p> <h4>Enter some details for your friend <?php echo $friend;?></h4> </form> </body></html>
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