How do different coding standards in PHP recommend handling underscores in variable names?

Different coding standards in PHP recommend handling underscores in variable names by using snake_case or camelCase. Snake_case involves using underscores to separate words in a variable name (e.g. $my_variable_name), while camelCase involves starting each word after the first with a capital letter and no underscores (e.g. $myVariableName). Consistency in naming conventions helps improve code readability and maintainability. 

// Example of snake_case variable naming
$my_variable_name = "Hello, World!";

// Example of camelCase variable naming
$myVariableName = "Hello, World!";

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coding standards PHP underscores variable names conventions

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