What are some potential pitfalls when dealing with long numbers or strings in PHP?

When dealing with long numbers or strings in PHP, potential pitfalls include memory usage and performance issues. To address this, consider using data types like integers or floats for numbers and limiting the length of strings to only what is necessary for your application.

// Example of using integers instead of strings for long numbers
$longNumber = 12345678901234567890;
echo $longNumber;