What are the potential security risks of using the dir() function to read directories from external sources in PHP?

Using the dir() function to read directories from external sources in PHP can potentially expose sensitive information or allow for directory traversal attacks if not properly sanitized. To mitigate this risk, it is important to validate and sanitize the input before passing it to the dir() function. 

$directory = '/path/to/directory';

// Validate and sanitize the input
if (strpos($directory, '../') !== false) {
    die('Invalid directory path');
}

$dir = dir($directory);

// Rest of the code to handle the directory

Keywords

dir function security risks external sources PHP directories

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