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When do you get an array from a meta field?
If you read the docs, you will see that, if the third parameter is false, you will get an array with all the values for that meta field. Remember that meta fields can be unique or can be multiple. Or it can be unique with a serialized data string. As it is, your code seems to store all values from the select multiple into one single meta field.
How to update post meta value as array?
The concept here is a bit different; you will several entries in the database with the same meta key, so you need to use add_post_meta () instead of update_post_meta () in order to add a new entry for each value. Now, you can use get_post_meta () with the third parameter set to false (it is the default value, so you can omit it):
Can a meta field be multiple or multiple?
Remember that meta fields can be unique or can be multiple. Or it can be unique with a serialized data string. As it is, your code seems to store all values from the select multiple into one single meta field. So, you get an array in the request and pass it as single value of the meta field.
How to work with post meta arrays in worpdress?
Working with post meta arrays. Post meta is data that is associated with a post. A post does not necessarily mean the default blog post type. Worpdress has 5 default post types: Post, Page, Attachment, Revision and Navigation Menu. These, any other custom post types, Comments and Users, all have a post meta table associated to them in the database.
Why is the fourth parameter of post meta called unique?
Add post meta’s fourth parameter is called “unique” because you will provide a boolean value, true or false, indicating whether you want to allow more than one meta key in the databases meta field relative to this post, of the same name as the one provided.
Which is better update or add post meta?
It is necessary to discuss update versus add, post meta. Using update post meta, if the meta key does not already exist, the method will create it. This allows you to use update exclusively, disregarding add post meta and using update to both update and add.
What makes up a post meta table in WordPress?
The post meta table consists of four columns; meta id, (post, comment or user) id, meta key and meta value. Each entry has a unique id, is associated with a parent post, comment or user and structurally consists of key value pairs. It is important to remember that wordpress meta data, like wordpress options are information stored as key and value.
How to get the post META array in WordPress?
If the value of the $key parameter is falsy get_post_meta will return the entire post meta array, even if $single is set to true. for example: get_post_meta( $post_id, FALSE, TRUE); //Returns all the post meta fields as an array.
Are there integers in update _ post _ meta?
To go off of Johannes’ response, since it is a serialized array, if you happen to be storing something like user id’s (which was my case), you may need to handle it a little differently. So yes they are integers but through update_post_meta they were being saved as strings.