What are the coding style best practices for using PHP functions?

PHP function coding best practices: Use type hints to ensure that function parameters are of the correct type. Avoid default values, use null values ​​and check parameter settings. Use expression closures to improve simplicity and readability. Explicitly declare function visibility and control access permissions. Handle errors by throwing exceptions instead of returning boolean values ​​หรือ use global variables.

PHP Function Coding Best Practices

In order to write efficient and maintainable PHP code, follow the following best practices for using PHP functions are crucial:

1. Function signature uses type hinting (Parameter Type Hinting)

Type hinting ensures that the function receives the expected parameter type, thereby improving Code robustness and reduce errors.

function add(int $a, int $b): int
{
    return $a + $b;
}

2. Avoid default values

Non-required parameters should avoid using default values. Instead, use a null value and check whether the parameter is set.

function render($view, array $data = [])
{
    if (empty($data)) {
        return $view;
    }

    // ...
}

3. Writing expression closures

For simple closures, using expression closures can improve readability and simplicity.

// 表达式闭包
$multiply = fn($a, $b) => $a * $b;

// 匿名函数
$multiply = function($a, $b) {
    return $a * $b;
};

4. Ensure the visibility of functions

Explicitly declare the visibility of functions (public, protected, private) to control access to them.

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

    public function publicMethod()
    {
        // ...
    }
}

5. Use exceptions to pass errors

Functions should handle errors by throwing exceptions, rather than returning Boolean values ​​or using global variables.

function parse($data)
{
    try {
        // ...
    } catch (ParseException $e) {
        throw $e;
    }
}

Practical Example: Calculating Pi

function calculatePi(int $n = 10000): float
{
    $pi = 0;
    for ($i = 0; $i < $n; $i++) {
        $pi += (pow(-1, $i)) * (4 / (2 * $i + 1));
    }

    return $pi;
}

// 使用
echo calculatePi();

By following these best practices, you can write PHP functions that are more efficient, more reliable, and easier to maintain.

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