How can variable naming conventions in PHP impact code readability and maintainability?

Variable naming conventions in PHP can impact code readability and maintainability by making it easier for developers to understand the purpose of each variable. Consistent and descriptive variable names can help other developers (or even your future self) quickly grasp the intention behind the code without needing to decipher cryptic or unclear names. By following a standardized naming convention, such as using camelCase or snake_case, you can ensure that your code is more organized and easier to maintain.

// Bad variable naming convention
$abc = 10;
$var1 = "Hello";

// Good variable naming convention
$numberOfApples = 10;
$greetingMessage = "Hello";