How can improper variable naming conventions lead to errors in PHP code?

Improper variable naming conventions in PHP can lead to errors because variables with unclear or misleading names can make the code difficult to understand and maintain. To avoid this issue, it's important to use descriptive and meaningful variable names that accurately represent the data they hold. By following a consistent naming convention, such as camelCase or snake_case, developers can improve the readability and maintainability of their code.

// Incorrect variable naming
$x = 10;
$y = 20;

// Correct variable naming
$firstNumber = 10;
$secondNumber = 20;