call_user_func_array

(PHP 4 >= 4.0.4, PHP 5)

call_user_func_array — Call a user function given with an array of parameters

说明

mixed call_user_func_array ( callback $function , array $param_arr )

Call a user defined function with the parameters in param_arr.

参数

function: The function to be called.
param_arr: The parameters to be passed to the function, as an indexed array.

返回值

Returns the function result, or FALSE on error.

更新日志

版本	说明
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.

范例

Example #1 call_user_func_array() example


<?php
function foobar($arg, $arg2) {
    echo __FUNCTION__, " got $arg and $arg2
";
}
class foo {
    function bar($arg, $arg2) {
        echo __METHOD__, " got $arg and $arg2
";
    }
}


// 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"));
?>

以上例程的输出类似于：

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}!
";
    }
}

// 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'));

?>

以上例程的输出类似于：

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))); 

?>

以上例程会输出：

int(8)

注释

Note:

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 will most likely be removed in the next version of PHP. 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 (does not apply if the passed value has a reference count = 1).