What is the difference between PHP functions and Go functions?

The main differences between PHP and Go functions include: typing (mandatory in Go, optional in PHP), default value (settable in PHP, not in Go), visibility (public by default in PHP, specified by keyword in Go), anonymous function (PHP supports it, Go does not support it), returns multiple values ​​(PHP can only return one, Go can return multiple values ​​and stores them in tuples), expansion operator (Go supports it, PHP does not support it).

The difference between PHP functions and Go functions

PHP and Go are both popular programming languages. They deal with functions in the way have different advantages and disadvantages.

Definition syntax

• PHP：

  function myFunction(string $name, int $age) {
    // function body
  }

• Go:

  func myFunction(name string, age int) {
    // function body
  }

Typed

• PHP The types of function parameters and return values ​​are optional.
• The types of Go function parameters and return values ​​are mandatory.

Default value

• PHP function parameters can set default values.
• Go function parameters cannot be set to default values.

Visibility

• PHP functions are public by default.
• Visibility of a Go function can be specified via the keywords func, const, or type.

Anonymous functions

• PHP supports anonymous functions, which can be defined using the function keyword.
• Go does not support anonymous functions.

Return multiple values

• PHP functions can only return at most one value.
• Go functions can return multiple values, which are stored in a structure called tuple.

Expansion operator

• PHP does not support the expansion operator for function parameters.
• Go supports the spread operator (...) for function parameters, which allows elements in a slice or array to be passed to a function as a single parameter.

Practical case: Calculate the minimum value

PHP：

function min(array $numbers) {
    $min = PHP_INT_MAX;
    foreach ($numbers as $number) {
        if ($number < $min) {
            $min = $number;
        }
    }
    return $min;
}

Go：

func min(numbers ...int) int {
    // 返回第一个参数，如果没有参数则返回 0
    if len(numbers) == 0 {
        return 0
    }

    min := numbers[0]
    for _, number := range numbers {
        if number < min {
            min = number
        }
    }
    return min
}

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