How can variable naming conventions affect the functionality of PHP scripts?

Variable naming conventions can affect the functionality of PHP scripts by making the code more readable and understandable for developers. By following a consistent naming convention, it becomes easier to identify the purpose of each variable and prevent naming conflicts. This can improve code maintenance and collaboration among team members.

// Bad variable naming convention
$var1 = 10;
$var2 = 20;

// Good variable naming convention
$firstNumber = 10;
$secondNumber = 20;