What potential pitfalls should beginners be aware of when using arrays and dates in PHP scripts?

When working with arrays in PHP, beginners should be cautious of accessing array elements that do not exist, as this can result in errors or unexpected behavior. To avoid this, always check if an array key exists before trying to access it using functions like isset() or array_key_exists(). Similarly, when working with dates in PHP, beginners should be mindful of formatting and timezone issues that can lead to incorrect date calculations or display. To ensure accurate date handling, always set the default timezone and use date formatting functions like date() or DateTime::format().

// Check if array key exists before accessing it
if(isset($array['key'])) {
    // Access the array element
    $value = $array['key'];
}

// Set default timezone
date_default_timezone_set('America/New_York');

// Get current date and time in a specific format
$currentDate = date('Y-m-d H:i:s');