What are the potential issues when including files from a different server in PHP?

Including files from a different server in PHP can pose security risks, such as exposing sensitive information or executing malicious code. To mitigate these risks, it's important to validate the source of the included file and use secure communication protocols like HTTPS. 

// Example of including a file from a different server with validation and HTTPS
$remote_file = 'https://example.com/remote_file.php';

if (filter_var($remote_file, FILTER_VALIDATE_URL)) {
    include $remote_file;
} else {
    echo 'Invalid URL';
}

Keywords

security risks remote file inclusion cross-site scripting data leakage server-side request forgery

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