call_user_func_array
create_function
Function handling 함수 목록
PHP Manual

# call_user_func

(PHP 4, PHP 5)

call_user_func — Call a user function given by the first parameter

### 설명

mixed call_user_func ( callback `$function` [, mixed `$parameter` [, mixed `$...` ]] )

Call a user defined function given by the `function` parameter.

### 인수

`function`

  The function to be called. Class methods may also be invoked statically using this function by passing array($classname, $methodname) to this parameter. Additionally class methods of an object instance may be called by passing array($objectinstance, $methodname) to this parameter.

`parameter`

  Zero or more parameters to be passed to the function.

  > Note: Note that the parameters for call_user_func() are not passed by reference.

  > Example #1 call_user_func() example and references

  > `<?php
  > error_reporting(E_ALL);
  > function increment(&$var)
  > {
  > $var++;
  > }
  > $a = 0;
  > call_user_func('increment', $a);
  > echo $a."\n";
  > call_user_func_array('increment', array(&$a)); // You can use this instead before PHP 5.3
  > echo $a."\n";
  > ?>`

  > 위 예제의 출력:

  >     0
  >     1

### 반환값

Returns the function result, or `FALSE` on error.

### 예제

Example #2 call_user_func() example

`<?php
function barber($type)
{
echo "You wanted a $type haircut, no problem\n";
}
call_user_func('barber', "mushroom");
call_user_func('barber', "shave");
?>`

위 예제의 출력:

    You wanted a mushroom haircut, no problem
    You wanted a shave haircut, no problem

Example #3 call_user_func() using namespace name

`<?php
namespace Foobar;
class Foo {
static public function test() {
print "Hello world!\n";
}
}
call_user_func(__NAMESPACE__ .'\Foo::test'); // As of PHP 5.3.0
call_user_func(array(__NAMESPACE__ .'\Foo', 'test')); // As of PHP 5.3.0
?>`

위 예제의 출력:

    Hello world!
    Hello world!

Example #4 Using a class method with call_user_func()

`<?php
class myclass {
static function say_hello()
{
echo "Hello!\n";
}
}
$classname = "myclass";
call_user_func(array($classname, 'say_hello'));
call_user_func($classname .'::say_hello'); // As of 5.2.3
$myobject = new myclass();
call_user_func(array($myobject, 'say_hello'));
?>`

위 예제의 출력:

    Hello!
    Hello!
    Hello!

Example #5 Using lambda function with call_user_func()

`<?php
call_user_func(function($arg) { print "[$arg]\n"; }, 'test'); /* As of PHP 5.3.0 */
?>`

위 예제의 출력:

    [test]

### 참고

- call_user_func_array() - Call a user function given with an array of parameters
- is_callable() - 변수 내용을 함수처럼 호출할 수 있는지 확인
- callback형에 대한 정보

call_user_func_array
create_function
Function handling 함수 목록
PHP Manual