Call a callback with an array of parameters

# call_user_func_array

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

call_user_func_array — Call a callback with an array of parameters

### Descrierea

call_user_func_array ( callable `$callback` , array `$param_arr` ) : mixed

Calls the `callback` given by the first parameter with the parameters in `param_arr`.

### Parametri

`callback`

  The callable to be called.

`param_arr`

  The parameters to be passed to the callback, as an indexed array.

### Valorile întoarse

Returns the return value of the callback, or `FALSE` on error.

### Istoricul schimbărilor

Versiune | Descriere
--- | ---
5.3.0 | The interpretation of object oriented keywords like parent and self has changed. Previously, calling them using the double colon syntax would emit an `E_STRICT` warning because they were interpreted as static.

### Exemple

Example #1 call_user_func_array() example

`<?php
function foobar($arg, $arg2) {
echo __FUNCTION__, " got $arg and $arg2\n";
}
class foo {
function bar($arg, $arg2) {
echo __METHOD__, " got $arg and $arg2\n";
}
}
// Call the foobar() function with 2 arguments
call_user_func_array("foobar", array("one", "two"));
// Call the $foo->bar() method with 2 arguments
$foo = new foo;
call_user_func_array(array($foo, "bar"), array("three", "four"));
?>`

Exemplul de mai sus va afișa ceva similar cu:

    foobar got one and two
    foo::bar got three and four

Example #2 call_user_func_array() using namespace name

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

Exemplul de mai sus va afișa ceva similar cu:

    Hello Hannes!
    Hello Philip!

Example #3 Using lambda function

`<?php
$func = function($arg1, $arg2) {
return $arg1 * $arg2;
};
var_dump(call_user_func_array($func, array(2, 4))); /* As of PHP 5.3.0 */
?>`

Exemplul de mai sus va afișa:

    int(8)

Example #4 Passing values by reference

`<?php
function mega(&$a){
$a = 55;
echo "function mega \$a=$a\n";
}
$bar = 77;
call_user_func_array('mega',array(&$bar));
echo "global \$bar=$bar\n";
?>`

Exemplul de mai sus va afișa:

    function mega $a=55
    global $bar=55

### Note

> Notă:

> Before PHP 5.4, referenced variables in `param_arr` are passed to the function by reference, regardless of whether the function expects the respective parameter to be passed by reference. This form of call-time pass by reference does not emit a deprecation notice, but it is nonetheless deprecated, and has been removed in PHP 5.4. Furthermore, this does not apply to internal functions, for which the function signature is honored. Passing by value when the function expects a parameter by reference results in a warning and having call_user_func() return `FALSE` (there is, however, an exception for passed values with reference count = 1, such as in literals, as these can be turned into references without ill effects — but also without writes to that value having any effect —; do not rely in this behavior, though, as the reference count is an implementation detail and the soundness of this behavior is questionable).

> Notă:

> Funcțiile de apel invers înregistrate cu astfel de funcții ca call_user_func() și call_user_func_array() nu vor fi apelate dacă există o excepție neinterceptată emisă într-un apel precedent.

### A se vedea și

- call_user_func() - Call the callback given by the first parameter
- informație despre tipul callback
- ReflectionFunction::invokeArgs() - Invokes function args
- ReflectionMethod::invokeArgs() - Invoke args