PHP call_user_func與回調函數的結合使用

$closureFunc = function(){
    return new RedisDB([
        'host' => '127.0.0.1',
        'port' => 6379
    ]);
};

$closureFunc();複製代碼

上面代碼是一個簡單的匿名函數寫法

print_r($closureFunc);
$instance = call_user_func($closureFunc);
print_r($instance);複製代碼

如今打印如上語句，其結果同樣的，都是RedisDB對象：

app\components\RedisDB Object
(
    [_di:protected] => 
    [_options:protected] => Array
        (
            [host] => 127.0.0.1
            [port] => 6379
        )

)
app\components\RedisDB Object
(
    [_di:protected] => 
    [_options:protected] => Array
        (
            [host] => 127.0.0.1
            [port] => 6379
        )

)複製代碼

若是打印print_r($closureFunc);其結果是Closure Object：

Closure Object
(
    [this] => app\modules\student\controllers\IndexController Object
        (
            [modelClass] => app\models\db\XmUsers
            [response] => app\common\base\BaseResponseService Object
                (
                    [format] => json
                    [acceptMimeType] => application/json
                    [acceptParams] => Array
                        (
                        )

                    [formatters] => Array
                        (
                            [html] => Array
                                (
                                    [class] => yii\web\HtmlResponseFormatter
                                )

                            [xml] => Array
                                (
                                    [class] => yii\web\XmlResponseFormatter
                                )

                            [json] => Array
                                (
                                    [class] => yii\web\JsonResponseFormatter
                                )

                            [jsonp] => Array
                                (
                                    [class] => yii\web\JsonResponseFormatter
                                    [useJsonp] => 1
                                )

                        ) 複製代碼

上面結果我只截取一小部分，確實是Closure對象

也就是說call_user_func參數能夠是匿名對象，官方文檔有這麼一句話：

call_user_func may also be used to call a closure or anonymous function that has been passed into a user-defined function.複製代碼

大意是：call_user_func還可用於調用已傳遞到用戶定義函數的閉包或匿名函數。

參考：www.php.cn/php-weiziji…

         www.jianshu.com/p/a3dd052aa…