(PHP 5 >= 5.1.2, PHP 7)
ReflectionFunction::invokeArgs — Invokes function args
Invokes the function and pass its arguments as array.
Returns the result of the invoked function
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)
}
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。
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.
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 ...