wordpress 插件:使用 OOP 设置 api [英] wordpress plugin : settings api with OOP

问题描述

我现在正在使用 OOP 来创建我的 wordpress 插件，但是我在设置 API 方面遇到了问题，我认为第三个参数(回调函数)应该 ECHO/PRINT 从定义的函数中返回值，而不是使函数回显输入，查看更多信息:

I am now using OOP to create my wordpress plugin, however i am having a problem with the Settings API,i think the third parameter (the callback function) should ECHO/PRINT a returned value from the defined function, and not make the function Echo the input, look at this for more informations :

这是您需要查看的代码片段:

and this is the code snippet you need to look at :

public function another_function(){
    add_settings_field('test', 'test', $this->get_input('test', 'test', 'text'), 'test_settings', 'test_settings');
}

public function get_input($id, $name, $type, $size=40, $droparray = NULL){
    $options = get_option('brutal_settings_group');
    switch ($type) {
        case 'text':
            echo '<input id="'. $id .'" name="test['. $name .']" size="'. $size .'" type="text" value="'. $options[$name] .'" />';
            break;
    }
}

由于 get_input 函数中的回声，每个页面中的字段都打印在所有内容之上，但是如果 wordpress 函数 add_settings_field 打印了一个返回值，而不是依靠函数自行打印它，它就会起作用，那么这个怎么出来的?

because of the echo in the get_input function, the fields get printed above everything in every page, but if the wordpress function add_settings_field printed a returned value and not counted on a function to print it for it self, it would've worked,so how to out come this ?

希望我的想法很清楚，最好的问候

Hope i got my idea clear, Best Regards

推荐答案

add_settings_field 期望它的第三个参数是 callback，但您实际上是在调用您的get_input 方法.为了使用 get_input 方法作为回调，您需要传递一个包含对象和方法名称的数组 array($this, 'get_input').

add_settings_field expects it's third argument to be a callback, but you are actually calling your get_input method. In order to use the get_input method as a callback you need to pass an array containing the object and method name array($this, 'get_input').

在执行此操作时，您不能将参数直接传递给方法，但我认为如果您将一组值作为第六个参数传递给您的 add_settings_field 调用 Wordpress 将依次传递此数组当它被调用时到你的回调.因此，您的 add_settings_field 调用将如下所示:

You can't pass arguments to directly to the method when doing this, but I think if you pass an array of values as the sixth argument to your add_settings_field call Wordpress will in turn pass this array to your callback when it's called. So, your add_settings_field call would look something like this:

add_settings_field(
    'test', 
    'test', 
    array($this, 'get_input'),
    'test_settings',
    'test_settings',
    array(
        'id' => 'test',
        'name' => 'test',
        'type' => 'text'
    )
);

然后您需要修改回调函数以从数组中提取值，如下所示.

You'd then need to modify your callback function to extract the values from the array, something like the below.

public function get_input($args) {
    $size = 40;
    $droparray = NULL;
    extract($args);
    …

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