<?php
function nowamagic($a,$b) 
{ 
 echo $a; 
 echo $b; 
} 
call_user_func('nowamagic', "",""); 
call_user_func('nowamagic', "",""); 
//显示  
?>

<?php
class a { 
 function b($c) 
 { 
  echo $c; 
 } 
} 
call_user_func(array("a", "b"),""); 
//显示 
?> 

<?php
function a($b, $c) 
{ 
 echo $b; 
 echo $c; 
} 
call_user_func_array('a', array("", "")); 
//显示 
?> 

<?php
Class ClassA 
{ 
function bc($b, $c) { 
  $bc = $b + $c; 
echo $bc; 
} 
} 
call_user_func_array(array('ClassA','bc'), array("", "")); 
//显示 
?> 

<?php
function a($b) 
{ 
 $b++; 
} 
$c = ; 
call_user_func('a', $c); 
echo $c;//显示 
call_user_func_array('a', array($c)); 
echo $c;//显示 
?>
另外，call_user_func函数和call_user_func_array函数都支持引用。
view sourceprint?
<?php
function increment(&$var)
{
 $var++;
}
$a = ;
call_user_func('increment', $a);
echo $a; // 
call_user_func_array('increment', array(&$a)); // You can use this instead
echo $a; // 
?>

function say($word)
{
 echo $word;
}
call_user_func('say', 'hello world'); //hello world
当然也可以调用类中的方法：
class A {
 function say($word = '')
 {
  echo $word;
 }
} 
$a = new A(); //注意，必须是要实例化的，除非是static
call_user_func(array($a, 'say'), 'hello world'); //hello world

function a($word)
{
 echo $word;
}
class A {
 function say($word = '')
 {
  echo $word;
 }
}
call_user_func_array('a', array('hello world')); //hello world
$a = new A(); //注意，必须是要实例化的，除非是static
call_user_func_array(array($a, 'say'), array('hello world')); //hello world