How should words in PHP function names be separated?

PHP function naming word separation guide: camel case naming method: used for methods, classes, properties, and the first letter of the word is capitalized. Underscore separation: used for functions and constants, words are separated by underscores.

PHP function naming word separation guide: camel case nomenclature and underscore separation

Camel case nomenclature

CamelCase is a naming convention that joins words together and capitalizes the first letter of each word (except the first word). It works for names of methods, classes, and properties.

// 方法
function get_user_name() {
    // ...
}

// 类
class User {
    // ...
}

// 属性
private $first_name;

Underscore-separated

Underscore-separated is a naming convention that separates words with underscores. It is more commonly used in the names of functions and constants.

// 函数
function get_user_name() {
    // ...
}

// 常量
define('USER_NAME', 'John Doe');

Practical case

Suppose we have a class named MyUser, which represents a user. If we wanted to create a function that gets the user's name, we could use the following name:

• Camel case: getUserName()
• Underscore delimited: get_user_name()

By convention, for functions, underscore delimited is usually preferred because it is the more commonly used style.

Selection Principles

When deciding which separation method to use, you can consider the following principles:

• For methods, classes, and properties, CamelCase nomenclature is generally preferred.
• For functions and constants, prefer underscore separation.
• Follow the naming convention of your team or project.
• Use names that are descriptive and easy to understand.

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