What are the rules for using underscores and hyphens in PHP function names?

PHP function naming rules: Underscore: used to separate words to improve readability; suitable for private methods or variables. Hyphens: should not be used in function names. Best practices: Avoid hyphens; use underscores to separate words; precede private or protected method or variable names with an underscore.

Usage rules for underscores and hyphens in PHP function naming

In PHP, function naming follows the following usage rules:

Underscore:

• is used to separate words to improve readability.
• Applies to private methods or variables.

Example:

function my_private_function() {
    // ...
}

Hyphens:

• should not be Used for function naming.

Best Practices:

In order to maintain code consistency and readability, it is recommended to follow the following rules:

• Avoid using hyphens.
• Use underscores to separate words.
• For private or protected methods or variables, use an underscore before the name.

Practical case:

Example 1:

Filefunctions.php

function get_user_info($id) {
    // ...
}

Usage:

$user_info = get_user_info(1);

Example 2:

Fileclass.php

class MyClass {
    private function _private_method() {
        // ...
    }
}

Usage:

$obj = new MyClass;
// 无法访问 _private_method() 因为它是一个私有方法。

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