What are the best practices for maintaining clean and readable PHP code when handling variables like "$x"?

When handling variables like "$x" in PHP code, it is important to use meaningful and descriptive variable names to maintain clean and readable code. This can help improve code readability, maintainability, and reduce the chances of confusion or errors. It is recommended to use variable names that reflect the purpose or value being stored in the variable.

// Bad practice - using a vague variable name like "$x"
$x = 10;

// Good practice - using a descriptive variable name
$numberOfApples = 10;