PHPで可変関数

variable-function1.php

<?php
function add($number1, $number2) {
	return $number1 + $number2;
}

$func = 'add';
echo $func(1, 1);
// -> 2

echo 'add'(1, 1);
// -> Error

echo call_user_func($func, 1, 2);
// -> 3

echo call_user_func('add', 2, 3);
// -> 5

echo call_user_func_array($func, array(3, 5));
// -> 8

echo call_user_func_array(
	function ($n1, $n2) {return $n1 + $n2;},
	array(5, 8)
);
// -> 13

variable-function2.php

<?php
$json = <<<JSON
[
	{
		"name":"max",
		"arguments":[1, 2, 3]
	},
	{
		"name":"sqrt",
		"arguments":[16]
	}
]
JSON;

$methods = json_decode($json);

foreach ($methods as $method) {
	var_dump(call_user_func_array($method->name, $method->arguments));
}
// -> int(3)
// -> double(4)