What are some common mistakes to avoid when working with directory listings in PHP?

One common mistake to avoid when working with directory listings in PHP is not properly sanitizing user input before using it to read files or directories. This can lead to security vulnerabilities such as directory traversal attacks. To prevent this, always sanitize user input and validate it before using it to access files or directories. 

// Sanitize user input before using it to read files or directories
$directory = filter_input(INPUT_GET, 'directory', FILTER_SANITIZE_STRING);

// Validate the directory path before accessing it
if (is_dir($directory)) {
    // Proceed with reading files or directories
} else {
    // Handle invalid directory path
}

Keywords

scandir opendir readdir file_exists security vulnerabilities

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