If you start creating your own theme or creating sub themes to customize other themes, you may have learned about template files and topic template hierarchies. But the theme function. How about PHP files? The function file puts all the required functions in the theme, not in a template. Therefore, the code does not only output one type of content or content at a certain location on a page such as a sidebar. Or footer. WordPress Codex defines the function file as follows: Feature files work like WordPress plug-ins, adding features to WordPress sites. This allows you to call functions in PHP and built-in WordPress and define your own functions. You can add code to the WordPress plug-in, or generate the same results through the WordPress Theme feature file. The
It is important to note the similarity between the function file and the plug-in file. Use function files for code similar to adding to a plug-in. In fact, if necessary, the site may have huge feature files and no plug-ins. But that wouldn’t be a good idea. If your site needs to use a lot of feature code or change the theme, you must put it in the plug-in before the code can continue to work. However, if the code depends on the topic, the function. PHP is the right place. The general rules are as follows: If you need to add simple functions related to how content is displayed, use the function. Use PHP (for example, it doesn’t work if you don’t activate the theme). For example, it might include adding additional fonts. The
Create a plug-in if the functionality is more complex, or if other functionality does not depend on the theme. For example, register a post type. Don’t lose the post type even if you change the topic later. In this post are functions. We will introduce several uses of PHP and show you how to add code to it and how to activate it. I will also ignore how many sub topic features, or add features to the parent topic. I’ll show you how to use PHP. General usage in function filesconsidering the purpose of the code (which will be lost when switching topics), there are several specific examples that are particularly useful when adding code. This includes: The
Notify WordPress of the location of the translation file where the topic supports additional topics, such as recommended images, post formats and RSS links. Use the navigation menu location to register sub topics and add, delete or redefine functions in the parent topic, so that users can add menus through the menu management screen. This post will show you how to perform these tasks separately. Add the code to the function file, add the code to the activation function file, and instruct WordPress to activate in the same way as using the plug-in. The method is as follows: Create a function called from the theme template file – there are code blocks to use at multiple locations in the theme, but useful when the template section is not working. Connect a function to an action or filter hook. When WordPress encounters the corresponding hook, it will execute the function. WordPress itself provides hundreds of hooks, and you can also find the hooks available in themes and plug-ins. To hook up an activated function with a theme purchased or ed from the WordPress plug-in directory. If you create something in PHP, you must create a sub topic to do this. Otherwise, the function file will be overwritten the next time the topic is updated. Then create a shortcut code to add to the content. Adding shortcut code through function files is not recommended. It is recommended to use plug-ins to add. That’s the only way.
It has no effect on the management screen displayed by the user. Translation means that all text added to the management screen through the topic is translated using the translation file. The
Use the load_theme \textdomain() function in the function file to notify WordPress of the location of the topic translation file: Load the summary 1c9db3673e9a82cdfb72. It uses the get\u template\u directory() function to find the directory of the topic, and then finds the file starting with wpmu theme in the language subdirectory. Therefore, the path is WP content \/ themes \/ mythemes \/ languages\/, and the file name of WP content \/ themes \/ mythemes \/ languages\/ is that the file starts with wpmu theme, followed by the language code. The
If you need to prepare a topic translation, you need to load at least this text field. A comprehensive guide to plug-in translation also applies to topics and tells you everything you need to know. Another operation performed in the navigation menu registration function file is to register the location of the navigation menu. If you are familiar with working as a third-party theme, you may see that there are many default navigation check boxes on the menu management screen, in which you can choose to add the created menu to the corresponding location of the theme. To allow users to do this in a topic, you must use the register NAV menu() function. The
The load summary 1c9db3673e9a82cdfb72 will be displayed as the default navigation on the management screen, and a menu location will be registered, where the ID is the default. Then use this ID as the header of the topic. Output the menu in a PHP file. In the code above, you are ready to translate the menu names. Therefore, anyone working on a topic in a language other than English will use my translation file to translate the corresponding \
Powerful. In a sub topic, you can use the function file to redefine or remove the features of the parent topic, or add unique new features. There are three ways to redefine or add functionality to a subtopic. Create a new version of pluggable functions. Disable features in the parent theme. Add unique features using the priority of the redefined parent theme feature. Let’s take a brief look at them in turn. If you are using a parent theme of a well coded plug-in feature or a theme framework designed to act as a parent theme, you may plug in the features of the feature file. To verify that the feature already exists, mark it as a conditional tag, so you can easily find nested topics, as follows: The function of loading the summary 1c9db3673e9a82cdfb72 sub topic runs before the function of the parent topic. Therefore, if a function with the same name is created on the sub topic, WordPress will not execute the function of the parent topic. Therefore, to redefine the parent theme, you simply create a unique function with the same name in the function file of the sub theme. To disable a feature disable a feature, disable a hook from a connected task or filter hook. Therefore, if the parent topic has a function called parent_function() activated through init hook, disable it in the sub topic as follows: Loading the summary 1c9db3673e9a82cdfb72 means that the parent function is no longer running. Then, if the subtopic requires additional functionality, you can create new functionality. Connect to the same hook, but do not specify the same name. Note: if the add_action() function of the parent function executing the function to be disabled has a priority parameter, the same priority must be included when disabling. I’ll get to the priorities in the next section. The last option to use function priority is to create a new function with a higher priority than the function you want to redefine. That is, it will run after the function. By default, WordPress first runs the function of sub themes, so you must do this. You must add a priority number to change it. Therefore, assume that the parent topic has a function named parent_function() whose priority is activated by 20 init hook. The load summary 1c9db3673e9a82cdfb72 can redefine the function and then connect to the init hook with higher priority, as shown in Figure 30. If the load summary 1c9db3673e9a82cdfb72 parent function does not assign priority, the default value of 10 is used. Therefore, you can use a value greater than 10 for a child function to run after the parent function. Function files are your friends. The working mode of theme function files is very similar to that of plug-ins, but it varies according to the theme. Therefore, when you switch topics later, you must only use it to add features that you do not want to lose or that other sites do not want to use. This post learned about the uses of function files and how to implement some of them. Pay attention to processing function files. Do not use plug-ins. This helps theme development! How to use function files? Do you avoid it completely and code plug-ins for it? Please tell us the following comments. Labels: Features
