What are the potential pitfalls of using the include() function in PHP, especially when dealing with file paths?

Using the include() function in PHP can lead to security vulnerabilities if the file paths are not properly sanitized. Attackers could potentially include malicious files or access sensitive information on the server. To mitigate this risk, always validate and sanitize user input before using it in include() statements. 

$filename = 'path/to/file.php';

if (strpos($filename, '/') !== false || strpos($filename, '\\') !== false) {
    die('Invalid file path');
}

include($filename);

Keywords

include file paths security vulnerabilities directory traversal file inclusion vulnerability

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