What are the best practices for PHP function parameter types?

PHP best practices for function parameter types include: clearly defining type hints and clarifying the expected types of function parameters. Use strict type restrictions, such as int, float, and string, and avoid generic types. Use optional parameters, using default values ​​or the ? type hint to indicate their optionality. Avoid using variadic arguments as it reduces readability and may cause unpredictable behavior. Use global constants to improve the readability and maintainability of frequently used types.

PHP Function Parameter Type Best Practices

In PHP, the type definition of function parameters helps ensure that the code is rude. Ability, readability and maintainability. Here are the best practices to follow:

Clearly define type hints

Use type hints to make the expected types of function parameters clear so that the compiler can type check and provide Useful error messages.

For example:

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

Use strict type restrictions

Use strict type hints whenever possible, for example int, float, and string. Avoid using generic types such as mixed as they allow values ​​of any type.

Using Optional Parameters

For optional parameters, use default values ​​or the ? type hint to indicate their optionality.

For example:

function greet(string $name, string $suffix = '!')
{
    return "Hello, $name$suffix";
}

Avoid using variable parameters

Avoid using ... Variable parameter because it reduces code readability and may cause unpredictable behavior.

Use global constants

For frequently used types, consider using global constants to improve readability and maintainability.

For example:

const TYPE_INT = 'int';
const TYPE_FLOAT = 'float';

Practical case

Consider a function used to calculate the area of ​​a geometric shape:

function calculateArea(string $shape, float $radius = null, float $length = null, float $width = null): float
{
    switch ($shape) {
        case 'circle':
            return pi() * $radius ** 2;
        case 'rectangle':
            return $length * $width;
        default:
            throw new InvalidArgumentException('Invalid shape: ' . $shape);
    }
}

By explicitly defining type hints, this function ensures appropriate input and allows the compiler to recognize invalid input types.

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