init plugin without construct?

  • Resolved firehold

    (@firehold)


    5 years, 11 months ago

    Hello,
    i am writing my first own plugin and it seems to work more and more.
    Now i getting problems with wp functions which are not useable in constructor but in functions after that. I googled little bit and found that hint:
    https://wordpress.stackexchange.com/questions/70055/best-way-to-initiate-a-class-in-a-wp-plugin

    To use an own contructor-function seems to be a coll idea, but i stuck on the problem, that i can use variables in the new constructor function and i dont know why.

    My code:

    add_action( 'plugins_loaded', array( 'MyPlugin', 'plugin_setup' ));
	
class MyPlugin {

    protected $url;
    protected $path;
    protected $basename;

    public static function plugin_setup() {
        $class = __CLASS__;
        new $class;
		
        $this->url = plugin_dir_url(__FILE__);
        $this->path =  plugin_dir_path(__FILE__);
        $this->basename = plugin_basename(__FILE__);		
    }
}

/*
global $myplugin;
$myplugin= new MyPlugin();
 */

    Error:
    Fatal error: Uncaught Error: Using $this when not in object context in /www/htdocs/XXXXX/wordpress/wp-content/plugins/myplugin/myplugin.php:41 Stack trace: #0 /www/htdocs/XXXXX/wordpress/wp-includes/class-wp-hook.php(286): MyPlugin::plugin_setup('') #1 /www/htdocs/XXXXX/wordpress/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #2 /www/htdocs/XXXXX/wordpress/wp-includes/plugin.php(465): WP_Hook->do_action(Array) #3 /www/htdocs/XXXXX/wordpress/wp-settings.php(374): do_action('plugins_loaded') #4 /www/htdocs/XXXXX/wordpress/wp-config.php(115): require_once('/www/htdocs/XXXXXX...') #5 /www/htdocs/XXXXX/wordpress/wp-load.php(37): require_once('/www/htdocs/XXXXXX...') #6 /www/htdocs/XXXXX/wordpress/wp-blog-header.php(13): require_once('/www/htdocs/XXXXXX...') #7 /www/htdocs/XXXXX/wordpress/index.php(17): require('/www/htdocs/XXXXXX...') #8 {main} thrown in /www/htdocs/XXXXX/wordpress/wp-content/plugins/myplugin/myplugin.php on line 41

    • This topic was modified 5 years, 11 months ago by firehold.
    • This topic was modified 5 years, 11 months ago by firehold.
    • This topic was modified 5 years, 11 months ago by firehold.
    • This topic was modified 5 years, 11 months ago by Steven Stern (sterndata).
Viewing 4 replies - 1 through 4 (of 4 total)
  • Dion

    (@diondesigns)

    Since the function is defined as static, these three lines:

    	$this->url = plugin_dir_url(__FILE__);
	$this->path =  plugin_dir_path(__FILE__);
	$this->basename = plugin_basename(__FILE__);

    must instead look like this:

    	self::>url = plugin_dir_url(__FILE__);
	self::path =  plugin_dir_path(__FILE__);
	self::basename = plugin_basename(__FILE__);

    The three variables must also be declared as static. You should instead be adding the hook from within a constructor, which would eliminate the need to mess around with static functions.

    I also have no idea why you are instantiating the class from within the static function. You might want to do some reading about how to use PHP classes.

    https://www.php.net/manual/en/language.oop5.basic.php

    Thread Starter firehold

    (@firehold)

    Thank you for your answer.

    As you can see usually i instantiating the class after the class. I outcommented it because the author in the empty constructor guide did this inside of the function.
    (i linked the post: instantiating )

    I thought this is needed cause of the different construction way.

    Is it possible to set the setup-function not static or is that needed to replace the constructor.

    De declaration of my needed variables in the class i did in the shortcode function until now yause i wasnt able to use wp classes inside of the constructor, because of this i was looking for another solution to setup the class/plugin.

    Dion

    (@diondesigns)

    This is what your code should look like:

    class MyPlugin {
	protected $url;
	protected $path;
	protected $basename;

	function __construct() {
		add_action( 'plugins_loaded', array( $this, 'plugin_setup' ));
	}

	function plugin_setup() {
		$this->url = plugin_dir_url(__FILE__);
		$this->path =  plugin_dir_path(__FILE__);
		$this->basename = plugin_basename(__FILE__);		
	}
}

global $myplugin;
$myplugin= new MyPlugin();

    If certain functions you need are not available at the plugins_loaded hook, you may want to use the init or wp_loaded hooks instead.

    (I made a mistake in my previous post. Below are the corrrect lines.)

    	self::$url = plugin_dir_url(__FILE__);
	self::$path =  plugin_dir_path(__FILE__);
	self::$basename = plugin_basename(__FILE__);
    Thread Starter firehold

    (@firehold)

    Thank you so much, that looks much more clear than the code before. So in plugin setup i can declare all my vars i need in the class.

    Manny thanks

Viewing 4 replies - 1 through 4 (of 4 total)
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