What are the drawbacks of using cryptic variable names in PHP code?

Using cryptic variable names in PHP code can make the code hard to understand and maintain for other developers. It can lead to confusion and errors when trying to debug or modify the code in the future. To solve this issue, it is recommended to use descriptive variable names that clearly convey the purpose of the variable.

// Bad example with cryptic variable names
$a = 10;
$b = 20;
$c = $a + $b;
echo $c;

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