What are some potential security risks associated with including files in PHP?

One potential security risk associated with including files in PHP is the possibility of including files from external sources that could contain malicious code. To mitigate this risk, it is important to validate and sanitize user input before including any files. Additionally, setting proper file permissions and using absolute file paths can help prevent unauthorized access to sensitive files. 

// Example of including a file with proper validation and sanitization
$allowed_files = ['file1.php', 'file2.php', 'file3.php'];
$file_to_include = $_GET['file'];

if (in_array($file_to_include, $allowed_files)) {
    include_once('/path/to/includes/' . $file_to_include);
} else {
    echo "Invalid file included.";
}

Keywords

File inclusion Remote code execution Directory traversal PHP include function File permissions

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