The code snippet in question is: $check = apply_filters( “update_{$meta_type}_metadata”, null, $object_id, $meta_key, $meta_value, $prev_value ); if ( null !== $check ) return (bool) $check; This filter only allows you to prevent the updating of the metadata for a given type, not to explicitly change the metadata itself. If you want to use this filter … Read more
In general, storing PHP serialized data in database in a bad idea. It can be easily understood if you use multple key-value pairs of data in one field row, that is, you use an array or a object with one meta key. Imaging a car as the object. You can set multiple meta values to … Read more
I’m sorry, but for now there is no easy way to “enable” revisioning of postmeta. However, you can add post metadata to revisions. A guy named John Blackburn wrote a pretty good article about adding post metadata to revisions. You find it here: https://johnblackbourn.com/post-meta-revisions-wordpress
The WP_Query object accepts a post meta argument. Generally speaking you want to do the following: $my_query = new WP_Query( array( ‘post_type’ => ‘post’, ‘meta_query’ => array( array( ‘key’ => ‘project_cat’, ‘value’ => ‘my-value’, ) ), // Other query properties ) ); Where ‘my-value’ is your ‘specified value’. Example usage: add_action( ‘pre_get_posts’ , ‘my_pre_get_posts’ ); … Read more
Although I would advice you to avoid this and use a plugin for this work. Because only a dedicated plugin can help SEO. “WordPress SEO” from yoost is a great plugin for SEO. That being said, here is the code for adding meta description and keywords in header. Paste this in theme’s functions.php file. function … Read more
Dave James Miller over at GitHub nailed this one for me. None of the work is from me, I’m just posting his code wrapped into a plguin since it works perfectly as advertised: <?php /** * Plugin Name: Set default category from url parameter * Plugin URI: https://gist.github.com/davejamesmiller/1966543 * Description: enables you to setup new … Read more
You do this: $item->content_multiple = get_post_meta($item->ID, ‘_menu_item_content_multiple’, true); Note how you set the third parameter of get_post_meta() to true, which means that only one value will be returned. 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 … Read more
After a lot of messing around with this, I think I found a fairly good solution here. I realize this is over a year after you asked but this was bothering me and I couldn’t find a good solution until now. The problem is that the get_post_metadata function doesn’t allow you to access the current … Read more
This part of wp_insert_posts() gives it away: if ( ! empty( $postarr[‘meta_input’] ) ) { foreach ( $postarr[‘meta_input’] as $field => $value ) { update_post_meta( $post_ID, $field, $value ); } } where we see how the post meta fields are updated/added with update_post_meta(). Here’s the inline description for meta_input: Array of post meta values keyed … Read more
If you can explain it in SQL, you can query for it! There are three places where we want to change the default query: SELECT wp_posts.* FROM wp_posts INNER JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) WHERE 1=1 AND wp_posts.post_type=”post” AND (wp_posts.post_status=”publish”) AND wp_postmeta.meta_key = ‘startDate’ AND CAST(wp_postmeta.meta_value AS CHAR) < ‘2011-03-23’ GROUP BY wp_posts.ID ORDER … Read more