找出这串代码的错误并给出正确答案<?php $servername = "127.0.0.1"; $username = "root"; $password = "123456"; $dbname="stu_result"; $conn=new mysqli($servername,$username,$password,$dbname); @mysqli_set_charset($conn,utf8); if($conn->connect_error) { die("连接失败：" . $conn->connect_error); } ?>

这段代码有两个小错误：

1. mysqli_set_charset() 函数应该放在 mysqli() 函数之后。因为 mysqli_set_charset() 函数需要一个有效的数据库连接作为参数，而 $conn 变量是在 mysqli() 函数中创建的。修改后的代码如下：

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
}
mysqli_set_charset($conn, "utf8");

2. @ 符号应该移除。这个符号会抑制连接失败时的错误信息，不利于代码调试和维护。修改后的代码如下：

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
}
mysqli_set_charset($conn, "utf8");

相关问题

找出这串代码的错误并给出正确答案<?php $servername = "127.0.0.1"; $username = "root"; $password = "123456" $dbname="stu_result"; $conn = new mysqli($servername,$username,$password,$dbname); @mysqli_set_charset($conn,utf8); if($conn->connect_eorror) { die("连接失败：" . $conn->connect_error); } ?>

这段代码的错误是缺少一个分号在第 3 行，导致语法错误。正确的代码如下所示：

<?php 
$servername = "127.0.0.1"; 
$username = "root"; 
$password = "123456"; // 加上分号
$dbname = "stu_result"; 
$conn = new mysqli($servername, $username, $password, $dbname); 
@mysqli_set_charset($conn, "utf8"); // 加上双引号
if ($conn->connect_error) { 
    die("连接失败：" . $conn->connect_error); 
} 
?>

帮我找出这串代码的错误并给出正确答案<?php $servername = "127.0.0.1"; $username = "root"; $password = "123456"; $dbname="stu_result"; $conn=new mysqli($servername,$username,$password,$dbname); if($conn->connect_error) { die("连接失败：" . $conn->connect_error); } mysqli_set_charset($conn,utf8); ?>

您的代码中在 `mysqli_set_charset()` 函数名之前缺少一个空格，并且应该将 "utf8" 改为 "'utf8'"。

下面是修改后的代码：

<?php
$servername = "127.0.0.1";
$username = "root";
$password = "123456";
$dbname = "stu_result";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
}
mysqli_set_charset($conn, 'utf8');
?>

另外，为了防止 SQL 注入攻击，建议在执行 SQL 语句前使用 `mysqli_real_escape_string()` 函数对输入的参数进行转义处理。