PHP call_user_func_array

Summary: in this tutorial, you’ll learn about the call_user_func_array() function and how to use it to call a function dynamically.

Introduction to the PHP call_user_func_array() function

The call_user_func_array() function calls a callback function with parameters. Here’s the syntax of the call_user_func_array() function:

call_user_func_array(callable $callback, array $args): mixed
Code language: PHP (php)

The call_user_func_array() has two parameters:

  • $callback is the name of a function or any callable that will be called.
  • $args is an array that contains parameters of the $callback.

The call_user_func_array() returns the value of the $callback.

PHP call_user_func_array function example

The following example illustrates how to use the call_user_func_array() function:

<?php function add(int $a, int $b): int { return $a + $b; } $result = call_user_func_array('add',[10,20]); echo $result; // 30
Code language: PHP (php)

How it works.

  • First, define a function add() that returns the sum of two integers.
  • Second, call the add() function via the call_user_func_array() function. The first argument is the function name, and the second argument is an array of arguments of the add() function.
  • Third, show the result to the output.

Summary

  • Use the PHP call_user_func_array() function to call a callback with parameters
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