In PHP, how do I deep copy strings with built-in functions?

In PHP, you can deep copy strings easily because strings are immutable in PHP. When you assign a string to another variable, PHP creates a new copy of the string in memory. However, if you need to make a copy of a string and manipulate it without affecting the original, you can simply use the assignment operator or functions like `strval()` which converts a variable to a string type.

Here's how you can deep copy strings using PHP built-in functions: