category.php模板无法正常工作，而index.php正常工作？

# 假设 index.php 在根目录下
ls /path/to/your/project/
# 确认 category.php 是否存在
ls /path/to/your/project/category.php

# 检查文件权限
ls -l /path/to/your/project/category.php
# 设置正确的权限（例如 644）
chmod 644 /path/to/your/project/category.php

<?php
// 数据库连接示例
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询示例
$sql = "SELECT id, name FROM categories";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();
?>