call_user_func_array

Call a callback with an array of parameters

&reftitle.description; `mixed` `call_user_func_array` `callable` `callback` `array` `param_arr`

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

&reftitle.parameters;

`callback`

- The `callable` to be called.

`param_arr`

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

&reftitle.returnvalues;

Returns the return value of the callback, or &false; on error.

&reftitle.changelog;

&Version; | &Description;
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.

&reftitle.examples;

### `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"));
    ?>

&example.outputs.similar;

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

### `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'));

    ?>

&example.outputs.similar;

    Hello Hannes!
    Hello Philip!

### 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 */

    ?>

&example.outputs;

    int(8)

&reftitle.notes;

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).

¬e.func-callback-exceptions;
&reftitle.seealso;

- `call_user_func`
- &seealso.callback;
- `ReflectionFunction::invokeArgs`
- `ReflectionMethod::invokeArgs`