Attach a private function at a hook?

Question

Attach a private function at a hook?

barakuda28

2021年2月25日 23:26

I have a class with some private public functions. The thing is that I don't want some of the functions to be able to be called outsite of the class, so I want to make them private. But I need to hook them at particular hooks and the hooks cannot call them if they are private. Is there some workaround for that?

Topic private functions Wordpress

Category Web

Alexander K. · Accepted Answer · 2021年2月25日 23:26

As of PHP 5.4 or higher, you can achieve this using a closure and bindTo() method:

$cb = function(){
  $this->callPrivateMethod();
};

$cb->bindTo($this);

add_action('init', $cb);

The above code is executed in the scope of a class hence $this is a valid value.

Pirate of KGP · Accepted Answer · 2019年3月18日 15:23

Generally hook performs outside of a class. It has been invoked inside a class or class method. So you cannot use it in a hook. If you do it by forcefully you shall have to instantiate inside a public method first, then use the public method into any hook. Example:

<?php
class tlSmAdminMenu{
    public function __construct(){
        add_action('admin_menu', array( $this, 'add_menu_page'));
    }
    public function add_menu_page(){
        add_menu_page('Themelines Plugin', 'TL Social Monster', 'manage_options', 'tl_social_monster', array( $this, 'admin_menu_cb'), '
dashicons-networking', 110);
    }
    public function admin_menu_cb(){
        $this->doStaff();
    }
    private function doStaff(){
        echo "<center><h1>THEMELINES SOCIAL MONSTER</h1></center>";
    }
}
if(class_exists('tlSmAdminMenu')){
    $tl_sm_obj= new tlSmAdminMenu();
}
?>

fuxia · Accepted Answer · 2018年3月26日 22:28

1

fuxia answered at 2018年3月26日 22:28

No that's impossible. When WordPress calls a method it has to be public. You could write a public method that is called on the hook which calls a private method inside.
Not sure if that makes sense though …

Adam · Accepted Answer · 2012年10月2日 11:38

Here is an example;

add_action( 'template_redirect', array( 'someClass', 'init' ));

class someClass {

    protected static $content = 'oh yeah, private!';    

    public static function init() {
        $class = __CLASS__;
        new $class;
    }

    private function __construct() {
        add_filter('the_content', array(&$this, 'get_this_function'));
    }

    public static function get_this_function(){
         return self::my_funk_she_on();
    }

    private static function my_funk_she_on(){
        return self::$content;
    }

}

In this example I am filtering the_content by passing a private function which gets its value from a private variable. Now since you can't call this directly my get_this_function is what will return what's private and that's what I pass into my constructor that adds the appropriate filter upon template_redirect.

You don't need to use static methods by the way, some recommend against it, but do as you please.

Attach a private function at a hook?

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