How can the use of underscores in variable names affect PHP code readability?

Using underscores in variable names can make the code less readable, especially when combined with camelCase or other naming conventions. To improve readability, it is recommended to stick to a consistent naming convention throughout the codebase. One common convention is to use camelCase for variable names in PHP. Example: 

// Less readable code using underscores
$first_name = "John";
$last_name = "Doe";

// More readable code using camelCase
$firstName = "John";
$lastName = "Doe";

Keywords

underscores variable names PHP code readability naming conventions

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