How to create a function with variable number of parameters in PHP?

In PHP, three dots (...) can be used to create a function with a variable number of parameters, which will be stored in an array. The variable number of arguments must be the last argument in the function argument list, and the variable number of arguments array can be retrieved using the func_get_args() function.

#How to create a function with a variable number of parameters in PHP?

Introduction

PHP functions can accept a variable number of arguments, which makes it easy to write functions that accept different numbers of input arguments. This is useful in dynamic languages, where the exact number of arguments cannot be known when the function is defined.

Syntax

To create a function with a variable number of arguments, use three dots (...) in the function parameter list, as shown below:

function myFunction(...$args) {
  // 代码
}

...$args Represents an array containing all arguments passed to the function.

Practical case

Create a function to calculate the sum of all elements in an array:

function sumArray(...$numbers) {
  $total = 0;
  foreach ($numbers as $number) {
    $total += $number;
  }
  return $total;
}

// 示例用法
$result = sumArray(1, 2, 3, 4, 5); // 结果：15

Note

• A variable number of parameters must always be the last parameter in the function parameter list.
• You can use the func_get_args() function to retrieve a variable number of argument arrays.
• A variable number of parameter arrays can be converted to a specific type by casting, for example:

function sumArray(int ...$numbers) {
  // 代码
}

This will force all passed parameters to be integers.

Hope this article helps you create functions with variable number of parameters in PHP.

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