我一直在这几个小时试图找到我所做的小错误，但我找不到它......我所做的只是在函数中调用一个变量作为全局变量，它甚至无法正常工作虽然它与上面的功能配合得很好......
我收到一条错误消息，说 mysqli 为空...
include 'data/mysqli_connect.php';
function process_login(){
global $mysqli;
$username = $_SESSION['username'];
$sql = "SELECT * FROM auth WHERE user='".mysqli_real_escape_string($mysqli,$username)."'";
$query = mysqli_query($mysqli,$sql);
if(mysqli_num_rows($query)>0){
$sql = "DELETE FROM auth WHERE user='".mysqli_real_escape_string($mysqli,$username)."'";
$query = mysqli_query($mysqli,$sql);
if(!$query){
die(mysqli_error());
}
}
$sql = "INSERT INTO auth (user, session) VALUES ('".mysqli_real_escape_string($mysqli,$username)."', '".$_SESSION['id']."')";
$query = mysqli_query($mysqli,$sql);
if(!$query){
echo "Can not insert info into database!<br />". mysqli_error();
}else{
header("Location:chat.php");
}
}
function logout(){
global $mysqli;
$sql = "DELETE FROM auth WHERE session='".mysqli_real_escape_string($mysqli,$_SESSION['id']). "'";
$query = mysqli_query($mysqli,$sql);
if(!$query){
echo "Can not delete info from database!";
}else{
session_destroy();
header("Location: chat.php");
}
}
function get_username(){
global $mysqli;
$sql = "SELECT * FROM auth WHERE session='".mysqli_real_escape_string($mysqli,$_SESSION['id']). "'";
$query = mysqli_query($mysqli,$sql);
$row = mysqli_fetch_array($query);
if(mysqli_num_rows($query) == "0"){
$username = "Guest";
}else{
$username = $row['user'];
}
return $username;
}
function post_message(){
global $mysqli;
$text = addslashes(htmlentities(htmlspecialchars($_REQUEST['text'])));
$sql = "INSERT INTO chat (time, user, text) VALUES ('".date("H:i")."', '".get_username()."', '".$text."')";
$query = mysqli_query($mysqli,$sql);
if(!$query){
die(mysqli_error());
}
}
mysqli_connect.php
$mysqli = mysqli_connect(localhost, "info", "info", "info");
就像我说的那样，它在这个上面的功能上起作用，但在这个上面不起作用，它没有意义......我猜我在某个地方有一个愚蠢的错误，只是不知道在哪里。
顺便说一句，我测试和工作的功能是process_login()和logout()get_username()
get_username()然后先运行process_login()。post_message()从一个 jquery 代码运行，当我按下 enter 时调用它可能工作正常，因为当我按下 enter 时我可以看到错误代码。
哦，抱歉代码格式错误，不知道如何在这里修复它。
感谢您提供的任何帮助或建议。