What are common pitfalls when trying to open and display subdirectories in PHP?

Common pitfalls when trying to open and display subdirectories in PHP include not properly handling file paths, not checking if the directory exists before trying to open it, and not handling potential errors that may occur during the process. To solve these issues, it is important to use functions like `is_dir()` to check if the directory exists, `opendir()` to open the directory, and `readdir()` to read the contents of the directory. 

$directory = "path/to/subdirectory";

if (is_dir($directory)) {
    if ($handle = opendir($directory)) {
        while (false !== ($entry = readdir($handle))) {
            if ($entry != "." && $entry != "..") {
                echo $entry . "<br>";
            }
        }
        closedir($handle);
    } else {
        echo "Error opening directory.";
    }
} else {
    echo "Directory does not exist.";
}

Keywords

scandir opendir readdir file permissions file paths

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