How can proper variable naming conventions improve the readability and maintainability of PHP code?

Proper variable naming conventions can improve the readability and maintainability of PHP code by making it easier for developers to understand the purpose and context of each variable. By using descriptive names that clearly convey the intended use of a variable, other developers (including your future self) can more easily follow the logic of the code and make changes or updates as needed. Additionally, consistent naming conventions help maintain a clean and organized codebase, reducing the likelihood of errors and making it easier to collaborate with others.

// Bad variable naming
$a = 10;
$b = 20;
$c = $a + $b;
echo $c;

// Good variable naming
$firstNumber = 10;
$secondNumber = 20;
$sum = $firstNumber + $secondNumber;
echo $sum;