headers already sent by php ERROR :|

Question

我在 php 上的以下代码有问题 :(

<?php echo $_GET["u"]; 
$servername = "localhost";
$username = "******";
$password = "*****?";
$dbname = "*****";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
$tt=$_GET["u"];
$sql = "SELECT url from code WHERE BINARY short="."'$tt'";
$result=$conn->query($sql);
$data=$result->fetch_assoc();
$url="Location: ".$data["url"];
header($url); /* Redirect browser */
exit();
?>

我在这一行的问题:(

 header($url); /* Redirect browser */

$url 变量是 link 从数据库中获取的变量。！

Answer 1

嗯，这不是说谎。您的脚本顶部有 echo $_GET["u"];。

发送前必须没有任何输出 headers。

headers already sent by php ERROR :|

headers already sent by php ERROR :|

html

php

redirect

location

header