What potential issues or conflicts could arise from using the method of including a file in every PHP file on the web server?

One potential issue that could arise from including a file in every PHP file on the web server is the risk of duplication or conflicting function or variable names. To solve this issue, you can use PHP's `require_once` function instead of `include` to ensure that the included file is only included once. 

```php
require_once('common.php');
```

This code snippet will include the 'common.php' file in every PHP file on the web server but will ensure that it is only included once to prevent duplication or conflicts.

Keywords

file inclusion PHP web server conflicts security vulnerabilities

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