ReflectionFunction::invokeArgs

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

ReflectionFunction::invokeArgs — Invokes function args

说明

public ReflectionFunction::invokeArgs ( array $args ) : mixed

Invokes the function and pass its arguments as array.

参数

args: The passed arguments to the function as an array, much like call_user_func_array() works.

返回值

Returns the result of the invoked function

范例

Example #1 ReflectionFunction::invokeArgs() example


<?php
function title($title, $name)
{
    return sprintf("%s. %s\r\n", $title, $name);
}

$function = new ReflectionFunction('title');

echo $function->invokeArgs(array('Dr', 'Phil'));
?>

以上例程会输出：

Dr. Phil

Example #2 ReflectionFunction::invokeArgs() with references example


<?php
function get_false_conditions(array $conditions, array &$false_conditions)
{
    foreach ($conditions as $condition) {
        if (!$condition) {
            $false_conditions[] = $condition;
        }
    }
}

$function_ref     = new ReflectionFunction('get_false_conditions');

$conditions       = array(true, false, -1, 0, 1);
$false_conditions = array();

$function_ref->invokeArgs(array($conditions, &$false_conditions));

var_dump($false_conditions);
?>

以上例程会输出：

array(2) {
  [0]=>
  bool(false)
  [1]=>
  int(0)
}

注释

Note:
如果函数有参数需为引用，那么它们必须以引用方式传入。

参见

ReflectionFunction::invoke() - Invokes function
ReflectionFunctionAbstract::getNumberOfParameters() - 获取参数数目
__invoke()
call_user_func_array() - 调用回调函数，并把一个数组参数作为回调函数的参数

User Contributed Notes

theyourcomputer at gmail dot com 05-Dec-2017 01:40


In the case of call_user_func_array(), if you were to pass around an anonymous function and reference $this within the anonymous function, $this will faithfully refer to the class in the context in which the function was defined. Using ReflectionFunction::invokeArgs() does not seem to retain its original context--yeah, even if you bind the anonymous function before invoking. I recommend call_user_func_array() where context is a concern.

Andrea Giammarchi 16-Feb-2008 06:41


I encountered a weird problem with ReflectionFunction, described in ticket 44139 of PHP Bugs.





If for some reason you need to call with invoke, or invokeArgs, a function like array_unshift (that accepts internally the array by reference) you could use this code to avoid the generated warning or fatal error.





<?php


function unshift(){


    $ref        = new ReflectionFunction('array_unshift');


    $arguments    = func_get_args();


    return        $ref->invokeArgs(array_merge(array(&$this->arr), $arguments));


}


?>





I don't know about performances (you can create an array manually too, starting from array(&$this->something) and adding arguments). However, it seems to work correctly without problems, at least until the send by reference will be usable with one single value ...