How to pass multiple parameters using PHP variadic function parameters?

PHP variadic function parameters pass multiple parameters as follows: declare the function using the [...] operator, which indicates that the function can receive any number of parameters. The syntax used is of the form: function my_function(...$args) {} Inside the function, $args will be an array containing all the arguments passed to the function.

How to pass multiple parameters using PHP variadic function parameters

PHP variadic function parameters allow you to pass any number of parameters to a function. This is useful when creating flexible and reusable functions.

Syntax

To declare a function with variadic parameters, use [...](https://www.php.net/manual/zh/ language.parameters.variable-length.php) operator, as shown below:

function my_function(...$args) {
  // $args 是一个数组，包含传递给函数的所有参数
}

Use cases

Variable function parameters are very useful in various situations. Here are a few examples:

Logging function:

function log_message(...$messages) {
  foreach ($messages as $message) {
    // 做一些日志记录操作
  }
}

This function can be used to log any number of messages.

Array processing function:

function array_combine(...$arrays) {
  // 将多个数组组合成一个关联数组
}

This function can be used to combine any number of arrays.

Practical Case

Let’s create a simple variadic function to calculate the average of a set of numbers:

function average(...$numbers) {
  $sum = 0;
  foreach ($numbers as $number) {
    $sum += $number;
  }
  return $sum / count($numbers);
}

$numbers = [1, 2, 3, 4, 5];

$avg = average(...$numbers); // 3

In this example, average ()The function can accept any number of parameters. It calculates the average by adding all the numbers and dividing by the total number of parameters.

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