Are there any recommended PHP scripts or tools available for implementing an IP ban based on specific keywords in accessed URLs?

To implement an IP ban based on specific keywords in accessed URLs, you can use PHP to check the requested URL for the specified keywords and then block the IP address if a match is found. One way to achieve this is by using PHP to access the server's access logs and parse the requested URLs for the keywords.

```php
<?php
$keywords = array('keyword1', 'keyword2', 'keyword3'); // Specify the keywords to ban
$ip = $_SERVER['REMOTE_ADDR']; // Get the visitor's IP address

// Check if the requested URL contains any of the specified keywords
foreach($keywords as $keyword) {
    if(strpos($_SERVER['REQUEST_URI'], $keyword) !== false) {
        // If a match is found, block the IP address
        file_put_contents('banned_ips.txt', $ip . "\n", FILE_APPEND);
        header("HTTP/1.1 403 Forbidden");
        exit();
    }
}
?>
```

This code snippet checks the requested URL for each keyword in the array `$keywords`. If a match is found, it logs the visitor's IP address in a file called `banned_ips.txt` and returns a 403 Forbidden response to block the access. Remember to adjust the keywords array to include the specific keywords you want to ban.