{"id":346,"date":"2015-03-02T12:16:13","date_gmt":"2015-03-02T07:16:13","guid":{"rendered":"http:\/\/128.199.176.160\/?p=346"},"modified":"2026-04-11T12:54:25","modified_gmt":"2026-04-11T07:54:25","slug":"what-is-a-wordpress-plugin-and-how-to-develop-it","status":"publish","type":"post","link":"https:\/\/wpbrigade.com\/what-is-a-wordpress-plugin-and-how-to-develop-it\/","title":{"rendered":"What is a WordPress Plugin and How to Develop it?"},"content":{"rendered":"\n<p><strong>WordPress<\/strong> is a flexible platform which provides developer to add extra functionality without changing the core of WordPress. To enhance the functionality of WordPress we need to write custom plugins. <strong>WordPress Plugins<\/strong> are just like <strong>add-ons<\/strong>, which uses the core functionality of WordPress and add custom functionality into it. <\/p>\n\n\n\n<p>In this article, we will look at what are <strong>WordPress plugins<\/strong> and how we can create one.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-a-plugin-in-wordpress\">What is a Plugin in WordPress?<\/h2>\n\n\n\n<p>A plugin is a piece of custom code that extends the functionality of WordPress which already exists. It could be a single line of code or a bunch of lines.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/wpbrigade.com\/wp-content\/uploads\/2015\/03\/What-is-a-Plugin-in-WordPress.jpg\" alt=\"What is a Plugin in WordPress\" class=\"wp-image-211912\" srcset=\"https:\/\/wpbrigade.com\/wp-content\/uploads\/2015\/03\/What-is-a-Plugin-in-WordPress.jpg 800w, https:\/\/wpbrigade.com\/wp-content\/uploads\/2015\/03\/What-is-a-Plugin-in-WordPress-300x225.jpg 300w, https:\/\/wpbrigade.com\/wp-content\/uploads\/2015\/03\/What-is-a-Plugin-in-WordPress-768x576.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-use-a-wordpress-plugin\">Why use a WordPress plugin?<\/h2>\n\n\n\n<p>Whenever you get a burger from a fast-food restaurant, you will be asked \u201d <strong>Sir, do you want extra cheese in your burger?<\/strong> \u201d<\/p>\n\n\n\n<p>Why extra cheese in a burger? Of course, it will enhance the taste of your burger but it is not necessary. You can have your burger without adding cheese to it.<\/p>\n\n\n\n<p><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\"><a href=\"https:\/\/wordpress.org\/\" target=\"_blank\"><strong>WordPress<\/strong><\/a>\u00a0is your\u00a0<em><strong>burger,<\/strong><\/em>\u00a0and a\u00a0<strong>plugin is your cheese<\/strong>\u00a0that will add new functionality or enhance the basic functionality of your WordPress.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-plugin-behavior\">Plugin Behavior<\/h2>\n\n\n\n<p>There are <strong>two types of basic plugin behaviors<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/codex.wordpress.org\/Function_Reference\/add_action\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>add_action()<\/strong><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/codex.wordpress.org\/Function_Reference\/add_filter\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>add_filter()<\/strong><\/a><\/li>\n<\/ol>\n\n\n\n<p><strong>add_action()<\/strong> and <strong>add_filter() both<\/strong> are <a href=\"https:\/\/developer.wordpress.org\/plugins\/hooks\/\"><strong>WordPress hooks<\/strong><\/a>, to know more about hooks&nbsp;there is a complete tutorial for you on Some useful hooks in WordPress.<\/p>\n\n\n\n<p>You want to perform some specific action using <strong>\u201cadd_action()\u201d<\/strong> when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p class=\"\">A post is made<\/p><\/li>\n\n\n\n<li><p class=\"\">A post of a specific category is made<\/p><\/li>\n\n\n\n<li><p class=\"\">If a specific word occurs in the title of a post<\/p><\/li>\n\n\n\n<li><p class=\"\">If a new user added to a\u00a0 particular group of users, like admins group, editors group<\/p><\/li>\n<\/ul>\n\n\n\n<p>And the list goes on, depending on your requirements.<\/p>\n\n\n\n<p>Let\u2019s come to the presentation side. You want to perform some action using <strong>\u201cadd_filter()\u201d<\/strong> when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p class=\"\">A post is presented(<strong>rendered<\/strong>) on the page<\/p><\/li>\n\n\n\n<li><p class=\"\">A post of a specific category is presented(rendered) on the page<\/p><\/li>\n\n\n\n<li><p class=\"\">If a specific word occurs in the title of a post<\/p><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-practical-example-for-add-action\"><strong>Practical example for <strong>\u201c<\/strong>add_action()<strong>\u201d<\/strong><\/strong>.<\/h4>\n\n\n\n<p>We will make a plugin that will fetch a list of email addresses of the subscribers from the database and send a notification email to each user having a link to that newly published post whenever a new post will be published<\/p>\n\n\n\n<p>Open a text editor and put this code snippet in the file and save it with any name in the <strong>&#8216;wordpress\\wp-content\\plugins&#8217; <\/strong>directory.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;?php\n\nadd_action(\u2018publish_post\u2019, \u2018notify\u2019);\n\nfunction notify(){\n\necho \u2018Notified';\n\n}\n\n?&gt;<\/pre>\n\n\n\n<p>Job has been done.&nbsp; You have successfully created your new plugin. Go to the admin dashboard move the mouse over the <strong>plugins<\/strong> option and click on &#8216;<strong>installed&nbsp;plugin&#8217;<\/strong> and see your plugin is coming in the list. What? It is not coming. Ok, no problem. Let\u2019s tell WordPress about our plugin so that WordPress can know about it.<\/p>\n\n\n\n<p>Open your plugin file and put these commented lines at the start of the file<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n\nPlugin Name: My Notify Plugin\nDescription: With this plugin, you can notify a group of users about the publishing of a new post\nAuthor: WpBrigade\nEmail: info@wpbrigade.com\nVersion: 1.0\n\n*\/<\/pre>\n\n\n\n<p>So now your plugin file should look like this.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;?php\n\n\/*\n\nPlugin Name: My Notify Plugin\nDescription: With this plugin, you can notify a group of users about the publishing of a new post\nAuthor: WpBrigade\nEmail: info@wpbrigade.com\nVersion: 1.0\n\n*\/\n\n&nbsp;add_action(\u2018publish_post\u2019, \u2018notify\u2019);\n\nfunction notify(){\n\necho 'Notified';\n\n}\n\n?&gt;<\/pre>\n\n\n\n<p><strong>&nbsp;\u201cpublish_post\u201d<\/strong> is a WordPress built-in function(<strong>hook<\/strong>) which is called when a post is to be published and what we are doing, we are telling the WordPress that when you call the <strong>\u201cpublish_post\u201d<\/strong> function call our function also inside you <strong>\u201cpublish_post\u201d<\/strong> function. This is called a hook. Like you don\u2019t go and touch the core function and enhance that function in your own way.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-example-for-add-filter\"><strong>Example for &#8220;add_filter()&#8221;.<\/strong><\/h4>\n\n\n\n<p>Open your <strong>text editor again<\/strong> and put this <strong>code snippet<\/strong> into it.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;?php\n\n\/*\n\nPlugin Name: Change Post Title\nDescription: With this plugin, you can change the titles of the post\nAuthor: WpBrigade\nEmail: infor@wpbrigade.com\nVersion: 1.0\n\n*\/\n\n&nbsp;add_filter(\u2018the_title\u2019, \u2018add_text_to_post_title\u2019);\n\n&nbsp;function add_text_to_post_title($title){\n\nreturn $title. \u2018 \u201cAdded when rendered\u201d\u2018;\n\n}\n\n?&gt;<\/pre>\n\n\n\n<p><strong>\u201cthe_title\u201d<\/strong> is also a WordPress <strong>hook<\/strong> and we are doing the same thing with it what we have done with the <strong>\u201cpublish_post\u201d hook<\/strong>.<\/p>\n\n\n\n<p>Again, keep the file and folder name the same, and put the plugin folder into the plugins directory.<\/p>\n\n\n\n<p>So this was a little about how to enhance WordPress functionality, and plugins don\u2019t stop here, you can create plugins to add new functionality to WordPress.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WordPress is a flexible platform which provides developer to add extra functionality without changing the core of WordPress. To enhance the functionality of WordPress we need to write custom plugins. WordPress Plugins are just like add-ons, which uses the core functionality of WordPress and add custom functionality into it. In this article, we will look [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":320182,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_analytify_skip_tracking":false,"footnotes":""},"categories":[571,570],"tags":[75,621,23],"class_list":["post-346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wordpress","category-wordpress-plugin","tag-plugin","tag-what-is-plugin-in-wordpress","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is a WordPress Plugin &amp; How to Develop it?<\/title>\n<meta name=\"description\" content=\"A piece of code. It could be a single line of code or a bunch of lines. But why to use a plugin? 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