How can absolute paths and query strings affect the validation of included files in PHP?

Absolute paths and query strings can affect the validation of included files in PHP by potentially allowing unauthorized access to sensitive files or executing malicious code. To prevent this, always validate user input and sanitize any file paths or query strings before including them in your PHP code. 

// Example of validating and sanitizing file paths before including them
$allowed_files = ['file1.php', 'file2.php'];
$file = isset($_GET['file']) ? $_GET['file'] : 'default.php';

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

Keywords

absolute paths query strings validation included files PHP

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