Title: init plugin without construct? Last modified: April 14, 2019 --- # init plugin without construct? * Resolved [firehold](https://wordpress.org/support/users/firehold/) * (@firehold) * [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/) * 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](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 7 years, 2 months ago by [firehold](https://wordpress.org/support/users/firehold/). - This topic was modified 7 years, 2 months ago by [firehold](https://wordpress.org/support/users/firehold/). - This topic was modified 7 years, 2 months ago by [firehold](https://wordpress.org/support/users/firehold/). - This topic was modified 7 years, 2 months ago by [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/). Viewing 4 replies - 1 through 4 (of 4 total) * [Dion](https://wordpress.org/support/users/diondesigns/) * (@diondesigns) * [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/#post-11427106) * 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](https://www.php.net/manual/en/language.oop5.basic.php) * Thread Starter [firehold](https://wordpress.org/support/users/firehold/) * (@firehold) * [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/#post-11427353) * 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](https://wordpress.org/support/users/diondesigns/) * (@diondesigns) * [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/#post-11427431) * 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](https://wordpress.org/support/users/firehold/) * (@firehold) * [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/#post-11427441) * 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) The topic ‘init plugin without construct?’ is closed to new replies. * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/) * 4 replies * 2 participants * Last reply from: [firehold](https://wordpress.org/support/users/firehold/) * Last activity: [7 years, 2 months ago](https://wordpress.org/support/topic/init-plugin-without-construct/#post-11427441) * Status: resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics