PHP class vs Function

Question

When and why should I wear one class instead of a function simple in PHP?

For example, I have a function that performs the insertion of a history in the database, which is a function common to many others.

---

php functions.

<?php
function insereHistorico($idUsuario, $descricao) {
    $sql = "INSERT INTO historico (id, descricao) VALUES ($idUsuario, $descricao)";
}

php file.

<?php
function adicionaUsuario() {
    //Executa todo o processo aqui
    //...

    //Insere no log
    insereHistorico($idUsuario);
}

---

But I also know that the same function could be a class, this way:

php functions.

<?php
class FuncaoClass {

    public function insereHistorico($idUsuario, $descricao) {
        $sql = "INSERT INTO historico (id, descricao) VALUES ($idUsuario, $descricao)";
    }
}

php file.

<?php
function adicionaUsuario() {
    //Executa todo o processo aqui
    //...

    //Insere no log
    $funcao = new FuncaoClass;
    $funcao->insereHistorico($idUsuario, $descricao);
}

---

What seems to me to be an advantage in the use of class is to have a more organized code, but as I am not an advanced user in PHP, I do not know what are the main differences or considered regarding this comparative.

Just to give the context, I use PHP to manage the backend of Websites/Webapps, where I use Angularjs to call these functions and manage the database. Normally functions similar to the example of arquivo.php return data (user list, news, requests, etc.) while functions such as the file example funções.php serve to do some management common to multiple functions.

Answer 1

The main feature of object orientation is to join or array, the data structure (usually a type defined by the programmer) class, with behaviors (methods). Some languages force this such as java, where it is not possible to define a method/function without an owner (class), php allows mixing classes/object with functions which may be an advantage in some cases.

Advantages of using classes:

• Allows simple grouping and sharing elements (properties) between methods.

• Methods can save the state of the object.

• Provides an intermediate scope between global and local variables, compared to functions and structured code.

Advantages of using function:

• The call of a function has its atomic execution or whether the action is performed or not, usually does not have/guard state, which is good for codes where it has concurrent accesses because they do not have to deal with synchronizations.