What are some best practices for naming variables in PHP that are clear and descriptive?

When naming variables in PHP, it is important to choose names that are clear, descriptive, and easy to understand. This helps improve the readability and maintainability of your code. Some best practices for naming variables include using meaningful names that reflect the purpose or content of the variable, using camelCase or snake_case for multi-word names, avoiding abbreviations or acronyms unless they are widely understood, and being consistent with naming conventions throughout your code.

// Example of clear and descriptive variable naming in PHP
$userName = "JohnDoe";
$userAge = 30;
$userEmail = "johndoe@example.com";