What are the naming rules for PHP functions?

PHP function naming rules are clear as follows: use lowercase letters and underscores to separate words; private functions start with double underscores; reflect function functions and avoid generic or ambiguous names; use verb-noun format, such as: print_message().

PHP function naming rules: clear and concise

In PHP, function names should follow certain naming rules to improve Code readability and maintainability. Following these rules helps other developers easily understand the intent and purpose of your code.

Naming rules:

• Function names should use lowercase letters and underscores to separate words.
• For private functions, the function name should start with a double underscore.
• Function names should reflect the functionality of the function and avoid using generic or ambiguous names.
• For longer function names, consider using abbreviations or aliases.
• Use verb-noun format, for example: print_message(), get_user_info().

Practical case:

Suppose you are creating a class for managing user data. Here's how to name your methods following the naming convention:

class UserManager {

    // 获取用户信息
    public function getUserInfo(int $id): User
    {
        return /* ... */;
    }

    // 更新用户信息
    public function updateUserInfo(User $user): void
    {
        /* ... */
    }

    // 私有方法：检查用户权限
    private function __checkUserPermission(User $user): bool
    {
        return /* ... */;
    }
}

This code example follows the naming convention:

• Use lowercase letters and underscores for method names.
• Private methods begin with a double underscore.
• Method names reflect their functionality, such as getUserInfo() and updateUserInfo().
• Longer names are abbreviated to __checkUserPermission().

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