Make your code clearer with named arguments in PHP8

Over time, the PHP language has become the language of choice for many web applications. The superiority of the PHP language is partly due to its ease of learning and partly due to its high degree of flexibility and scalability. PHP 8 is the latest version and it introduces many new features, the most prominent of which is named arguments.

Named arguments is a new feature that allows programmers to use parameter names to specify parameter values ​​when calling functions, which makes the code clearer and easier to understand. When using this feature, the order of parameters can be different from the order in the function signature, because the parameter names already specify their meaning.

Previously, in PHP, parameters had to be passed in the order given in the function signature. This means that if you pass the wrong parameters or the parameters in the wrong order, your code will break. Let's look at a simple example.

Suppose we have a function named "getFullName". This function has three parameters: $firstName, $middleName and $lastName. These parameters are passed in this order. Using named arguments, we can change this function call to a more understandable way:

getFullName(firstName: 'John', lastName: 'Doe', middleName: 'Smith');

As shown above, this usage makes the readability of the code easier, and the programmer can directly see each actual values ​​of the parameters without having to remember the order of the parameters.

In addition, named arguments can also help us avoid the problem of adding unused default values ​​​​in function signatures. Here is an example:

function createUser($name, $surname, $id = 0, $age = 0) {
  // some code here
}

Suppose we only want to pass parameters for $surname and $age, we can use named arguments to specify these parameters explicitly while ignoring other parameters:

createUser(name: 'John', surname: 'Doe', age: 32);

As you As you can see, we only passed parameters for $surname and $age, and the default value of $id will be used.

At the same time, named arguments also supports omitting some default parameters when calling. If the function signature defines some parameters with default values, the default values ​​provided when calling can be omitted by using named arguments:

function printData($name = "", $age = 0, $gender = "Male") {
    echo "$name is $gender and $age years old";
}

printData(name: "John", age: 28);

In the above example, we only passed parameters for $name and $age, but The default value of $gender will be used.

In PHP 8, named arguments is an exciting new feature that makes code clearer and simplifies the syntax of function calls, while also improving code readability and maintainability.

The above is the detailed content of Make your code clearer with named arguments in PHP8. For more information, please follow other related articles on the PHP Chinese website!