Over the past 12 months, we have created several posts focusing on adding functionality to WordPress using custom fields. Create a custom post list template, make a complete travel blog, etc. Using plug-ins such as custom press and advanced custom fields, you can easily create custom article types, but to truly understand how they work, you need to go deep into their internals. Therefore, this post will show you how to manually create custom fields. Join us. For me, the custom field function is the foundation of the CMS system. Custom posts and taxonomies are great, but to build other non blog type systems, you need to bind data to the functionality in the posts. The
The two basic ways for WordPress to do this are custom fields and custom meta boxes. Before looking at how they are used, I think it is important to understand the basic mechanism post metadata. What is post metadata? Post metadata (or post meta) is a term that describes all types of data attached to a post. Each single data segment is stored in the wp_posteta table, which contains four columns: ID, post\u ID, meta\u key and meta\u value. Male publish meta in the database. The screenshot above was taken from phpMyAdmin, which displays the original database data. Both lines displayed are associated with post\u id3974. The first line is added by word press to indicate who last edited the post. The second value is used to save the SEO title in the SEO plug-in. The
WordPress uses a post method internally to handle various situations. You have determined how the last editor is saved. Another compelling example is saving a recommended image of a post. When the post 3974 receives a recommended image, a new post meta line will be created using the \u thumbnail\u ID meta key. The meta value contains the ID of the specified image. Custom fields and metaboxcustom fields and metaboxes are user interface elements that can be used to enter data in word press. The custom fields section is provided by WordPress and is directly connected to the post meta function described above. The
After inputting the WordPress custom field name and value, directly generate rows in the posteta table. In contrast, by default, metabox is a UI helper embedded in WordPress. Provides a way to easily add input mechanisms to publish edit pages. You can choose to connect to the post meta function, but you can not only use it, but also use it for other things. We recently introduced this in the \
Fortunately, this is simple. You only need three functions: get\u post\u meta(), add\u post\u meta(), and update\u post\u meta(). We will get the data we want to use and start. The post meta import get\u post\u meta() function uses the three parameters get\u post\u meta() to obtain the ID, key and single or multiple values of the post. The first two things should be quite clear, but the third thing can be confusing. Remember how metadata rows contain keys and values? Prevent adding multiple rows with the same key
This means that you don’t have to worry about the et\u post\u meta() function call. There is only one database request, after which all requests are cached. 4. import all metadata at one time. The get_post\u meta() function can return all meta keys and values of a given post. If you omit the second and third parameters and pass only the post ID, you can get a beautiful array containing all the data of the post in the database. Finishing custom fields and metadata systems make word press a core element today. What’s more, the mechanism is very easy to use and can grant more permissions to plug-ins and topics. By practicing using the features in the task to understand the basics, you can immediately create great applications. Is metadata used in a unique way? Please tell us the following comments. Labels: custom field metadata
