How can PHP code be optimized for better readability and efficiency when accessing variables like $mysites?

To optimize PHP code for better readability and efficiency when accessing variables like $mysites, consider using shorthand ternary operators to handle null values and ensure the variable is set before accessing it. This can help prevent errors and make the code more concise.

// Using shorthand ternary operator to handle null values and ensure $mysites is set
$mysites = $mysites ?? [];