What are the consequences of using numbered variables instead of descriptive names in PHP scripts?

Using numbered variables instead of descriptive names in PHP scripts can make the code harder to read and maintain. It can lead to confusion about the purpose of each variable and make debugging more difficult. To solve this issue, it's best practice to use descriptive names that clearly indicate the purpose of each variable.

// Bad practice: using numbered variables
$var1 = 10;
$var2 = 20;

// Good practice: using descriptive names
$firstNumber = 10;
$secondNumber = 20;