How can meaningful variable names improve the readability and maintainability of PHP code?

Meaningful variable names can improve the readability and maintainability of PHP code by providing clear and descriptive names that convey the purpose or content of the variable. This makes it easier for other developers (or even yourself in the future) to understand the code without having to decipher cryptic or vague variable names. Additionally, meaningful variable names can help prevent errors and make debugging easier by reducing the likelihood of confusion or misinterpretation.

// Bad variable names
$a = 10;
$b = 20;
$result = $a + $b;
echo $result;

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