コード
<?php
function test(){
echo "func test".PHP_EOL;
}
class TestClass{
public function __construct(){
echo "TEST".PHP_EOL;
}
public function test(){
echo "test".PHP_EOL;
}
}
call_user_func("test");
$testClass = new TestClass();
call_user_func(array($testClass, "test"));
call_user_func(function(){ echo "no name".PHP_EOL; });
実行
func test
TEST
test
no name