php-sqlite 3 must installed in order to run queries using PDO technique.

I had to run `sudo apt install php-sqlite3` in order to get the line queries to run without an error. Before running `sudo apt install php-sqlite3`, I received this error in the Bash terminal:
```
127.0.0.1:60862 [500]: / - Uncaught Error: Call to a member function fetchAll() on boolean in /home/someone/Desktop/practice-php/index.php:22
Stack trace:
#0 {main}
thrown in /home/rob/Desktop/practice-php/index.php on line 22
```

阅读第 22 行附近的 index.php，并在检查 php-sqlite3 是否可用后重现 PDO 查询。将项目设置与报告中的依赖项要求进行比较。当预期的设置已明确，并且查询不再产生 fetchAll-on-boolean 错误时，即表示完成。

由索引模型根据 Issue 内容生成。