How does PHP handle variable declarations and assignments, and what are the implications for writing clean and efficient code?

When declaring variables in PHP, it is important to use meaningful names and follow a consistent naming convention to make the code more readable and maintainable. Additionally, it is good practice to initialize variables at the point of declaration to avoid unexpected behavior. This helps ensure that variables are properly scoped and have the correct values throughout the code.

// Good practice: declare variables with meaningful names and initialize them at the point of declaration
$userName = "John Doe";
$userAge = 30;
$isSubscribed = true;