What are the best practices for preventing individual content pages from being displayed without the index page in PHP?

To prevent individual content pages from being displayed without the index page in PHP, you can use a check at the beginning of each content page to ensure it is being accessed through the index page. This can be done by checking for a specific session variable or a defined constant that is set on the index page. 

```php
<?php
session_start();

if(!isset($_SESSION['loggedIn']) || $_SESSION['loggedIn'] !== true) {
    header("Location: index.php");
    exit();
}
?>
```

In this code snippet, we are checking if the 'loggedIn' session variable is set to true. If it is not set or is not true, the user is redirected to the index page. This ensures that the content page is only accessible through the index page.

Keywords

PHP htaccess redirect header error handling

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