Named arguments in PHP8 make your code easier to read and write

PHP8 introduces a new feature - named arguments (named parameters), which can make function calls clearer and more concise, and the logic easier to understand. This article will introduce named arguments in PHP8, as well as its benefits and application scenarios.

What are named arguments?

In PHP8, we can specify a name for certain parameters when calling a function, so that we can use these names to refer to the corresponding parameters inside the function. For example, the previous method was to call a function by passing a bunch of parameters:

function generateFullName($first, $last, $middle, $suffix) {
    if(!empty($middle)) {
        return "$first $middle $last $suffix";
    } else {
        return "$first $last $suffix";
    }
}

echo generateFullName('John', 'Doe', '', 'Jr.'); // 输出: John Doe Jr.

The way to call a function using named arguments is as follows:

echo generateFullName(last: 'Doe', first: 'John', suffix: 'Jr.'); // 输出: John Doe Jr.

As can be seen from the above example, the code can be made more Readability and maintainability.

What are the benefits of named arguments?

1. The code is more readable

named arguments make the meaning of the parameters clearer, and you can understand the role of each parameter faster when reading the code.

2. Code is easier to write

When there are many parameters when calling a function, named arguments allows you to fill in only those necessary parameters and avoid some unnecessary ones. parameter. Therefore, it can also improve code writing speed and code reuse.

3. The code is easier to maintain

named arguments make the code clearer and more concise, avoiding some redundant code. This makes the code easier to maintain and easier to debug when debugging the code.

How to use named arguments?

Named arguments can specify the name and value of each parameter when calling the function. The usage method is as follows:

function testFunction($a, $b, $c) {
    echo "a:$a; b:$b; c:$c";
}

testFunction(a:1, c:2, b:3); // 输出: a:1; b:3; c:2

As you can see, the parameter name specified by named arguments can be any name in the future. Instead of following the parameter names defined in the function.

One thing to note is that in PHP8, named arguments must be written after the positional parameters and cannot be mixed with positional parameters.

Application scenarios of named arguments

Named arguments insist on readability and ease of use, and are best used extensively in the code base to improve the overall readability of the project. Divided into the following scenarios:

1. When there are many parameters or the number of parameters is uncertain

When there are many function parameters or the number of parameters is uncertain, using named arguments can make the code look like Clearer.

2. Optional parameters

Some parameters in the function are optional. Using named arguments can make optional parameters easier to use.

3. Evolution of function signature

When upgrading in business, function signatures usually change. If you use named arguments, you can modify the code more easily without worrying about the order being changed. Change.

4. When using third-party libraries

When using third-party libraries, we are not familiar with the definition of functions. At this time, using named arguments can make the function easier to use. and understanding.

Summary

named arguments simplifies parameter passing during code calling and enhances the readability and ease of use of the code. This is useful when dealing with functions with many parameters or optional parameters, especially when the function signature changes as the business evolves. It can be seen that named arguments in PHP8 bring new solutions to improve the readability and ease of use of the code, making our code easier to maintain and develop.

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