(PHP 5 >= 5.1.2, PHP 7, PHP 8)
ReflectionFunction::invokeArgs — 引数を指定して関数を起動する
起動した関数の結果を返します。
| バージョン | 説明 |
|---|---|
| 8.0.0 |
args のキーは、
静かに無視されるのではなく、パラメータの名前として解釈されるようになりました。
|
例1 ReflectionFunction::invokeArgs() の例
<?php
function title($title, $name)
{
return sprintf("%s. %s\r\n", $title, $name);
}
$function = new ReflectionFunction('title');
echo $function->invokeArgs(array('Dr', 'Phil'));
?>上の例の出力は以下となります。
Dr. Phil
例2 ReflectionFunction::invokeArgs() で参照を使う例
<?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);
?>上の例の出力は以下となります。
array(2) {
[0]=>
bool(false)
[1]=>
int(0)
}
注意:
関数の引数の中にリファレンス渡しを要するものがある場合は、 渡す引数の中でもリファレンスにしておく必要があります。
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 ...