Are you interested in creating a word press plug-in from scratch? If you have never tried before, coding your own plug-ins may be challenging, especially if you have no confidence in PHP technology. The problem is knowing how to start and making mistakes in the process. With plug-ins, you can add all kinds of features to WordPress, from adding simple query forms to pages to enhancing security and adding e-commerce features. If you can dream, you will have a plug-in that can do it. Or, you might have your own plug-in ideas. The
This is the last post in the 5-episode series for beginners. It teaches you the basic concepts of WordPress development, and you can jump from a substitute to a developer. At the end of the series, you can create your own basic themes and plug-ins and concretize them into your own functions. In this guide, you will learn how to code your plug-ins to modify the functionality of word press sites, third-party plug-ins, and topics. Note: for this series, you must fully understand HTML and CSS. Because both languages are necessary building blocks to use WordPress. The
Let’s go! Have you missed the word press development series for beginners? You can view all 5 posts here. Develop WordPress for beginners: start developing WordPress for beginners: develop WordPress for beginners learning PHP: develop WordPress for beginners building themes: develop WordPress for beginners learning components and menus: let’s take a closer look at hooks, tasks and filters before creating the actual plug-ins for drawing board hooks, tasks and filters. The entire plug-in system is based on these elements, which helps you fully understand the actual working side of word press. The
Let’s look at an example. If you wanted to create a plug-in to add some analysis tracking code to the site, what would you do? The tracking code is usually placed at the bottom of the page immediately before the closed male tag. If the theme has been converted, it must be left as is and run in all word press installations. What if the subject cannot be controlled directly? Developing WordPress for beginners: the wp\u head() and wp\u footer() functions were mentioned in the topic creation. Do you remember how to add them to the wp\u head() topic? The example above is the exact reason why it must exist. The wp_footer() function can run other functions defined by the plug-in. The
The following is a code example that can be played together: Loading summary 2bbe395f732c7ee90f0a all disassembled. First, we wrote a function that only echoes the trace code. This is only a function in my plug-in. It is not available anywhere. Then use the add\u action() function to run my function in word press at the time of add\u action(). Every time word press arrives, wp\u header() function will be used, and all completely different functions add\u action() will be found. Then run these functions one by one, and finally return to the trace code. The
This is the basis for hooking, but later in this tutorial, we will study hooking in more depth to learn and use this feature. Before proceeding, I would like to mention some changes. The wp\u footer() function of the topic footnote is not actually a hook, but contains a simple function that is hooked somewhere in the code. The hook is called: do\u action (\
Therefore, before continuing, we will correctly explain the terms to be read in this tutorial. The
Hooking is part of the WordPress plugin API. Tasks and filters are two types of hooks. You can add functions through actions. By default, WordPress defines the functionality that runs each time you process a hook. Filters work similarly, but modify existing features instead of adding features. For example, WordPress has a hook (55 words) that determines the length of the extract statement. You can use filters to change the number of words. Now that we know all the basics of action, let’s look at it in more detail in order to better understand the add_action() function. The function takes four arguments: The
The name of the hook is allowed. We have seen the first two arguments of the hook function name first. This is the only one we need. Determine which functions should run and where. The third parameter determines the sequence of functions to be run. This is useful when multiple functions are connected to the same hook. You can add multiple tracking codes to a web site. The priority argument allows you to control when the function runs. The allowed arguments simply tell the function connected to WordPress how many arguments are allowed. To determine if there are any items to add here, you must check the WordPress Codex for each hook. Some functions take multiple arguments and must be specified here. The following example will help you understand why this is the way to create our own hooks in the future. The
Example actions WordPress provides actions not only in topics, but also in the context of back-end administrator and specific user actions. The publish_post hook runs when you publish a post, and you can do anything at this time. This shows the necessity of demonstration. After adding features to this hook, how do I know the posts and details published? By hooking up the document, you can see that two arguments are passed in the function: Post ID and post data. For example, if a post is published, we will send an email to the post author. As I mentioned earlier, the loading summary 2bbe395f732c7ee90f0a filter works in almost the same way, but because the data is modified, most of it is returned in the hook function. To add a filter, we can use parameters such as add_filter() and add\u action(). The
A good example of starting the sample filter is to modify the more string of the excerpt by default. To modify it: Load summary 2bbe395f732c7ee90f0a priority and allowed arguments are not specified. Thus, the priority is 10 and the allowed argument is 1. Do not use the passed arguments (the default value is more text) and only return a string. You can use the same method to insert advertisements in the first paragraph of a single post. Watch: load several CSS on the right side of the summary 2bbe395f732c7ee90f0a advertisement, and you can create a standard advertisement block in the content in just a few seconds. The
Learning how to define a hook, define a hook and how to create your own hook may be very helpful to understand the system. Suppose you create an e-commerce plug-in and add the ability to list products. You can: Load summary 2bbe395f732c7ee90f0a by default, 10 products are hard coded for display. What if someone wanted to create an extension for your operation and display only three products? Writing code cleverly allows others to modify it. Let’s use the hook so that developers can take advantage of the work.
