Q1 Yes, you can store serialized arrays as a single meta key, eg: update_post_meta( $post_id, ‘my_items’, array( 1, 2, 3, 4 ); Furthermore, you can store multiple values against a single meta key, eg: add_post_meta( $post_id, ‘my_items’, 1 ); add_post_meta( $post_id, ‘my_items’, 2 ); The latter is preferred because meta queries can be more efficiently … Read more
Apparently the serialized data got corrupt, calling the field by query got me this error. WordPress does not return an error when the serialized data is corrupt just a bool(false). Solved this by insert/update the serialized data in a base64_encode() and call it with base64_decode(). This seems to do the trick and data can be … Read more
OK, so you have some code that uses add_post_meta and you want to make it add only unique values. The problem in here is that add_post_meta does exactly what it’s name is saying – it adds a post meta value. There is 4th arg for that function that’s called unique, but it work based on … Read more
You can get using this using SQL global $wpdb; // For single record $wpdb->get_row(“SELECT post_id FROM $wpdb->postmeta WHERE meta_key = $param1 AND meta_value = $param2”); // For multiple records $wpdb->get_results(“SELECT post_id FROM $wpdb->postmeta WHERE meta_key = $param1 AND meta_value = $param2” ); Use this for query $args = array( ‘posts_per_page’ => 10, // -1 for … Read more
WordPress fires the updated_{$meta_type}_meta hook which fires after the metadata is updated. In your case, the hook would be updated_post_meta and you could have your function run on that hook instead of the save_post hook.
Two things I could imagine: Check the post_modified value. Maybe import creates a definitive timestamp that you could use. You’ll still have to save the import date somewhere so you can check against it. I do some post importing via a stream/HTTP response (this is not the native importer). During the import, I map my … Read more
Yes. get_post_meta() uses get_metadata() which in turn uses update_meta_cache() to retrieve the values. In the source code we see this part (comment mine) // $id_column is ‘meta_id’ $meta_list = $wpdb->get_results( “SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC”, ARRAY_A ); So the meta values will be ordered by meta_id … Read more
There is not a standerized way to add HTML meta tags in WordPress but you can use wp_head action as a generic way to add meta tags. I think description meta tag should not be in the theme, as you suggest in your answer, because description meta tag is a property of the document, nothing … Read more
Depends what you are getting back from the ‘date_event’ post-meta field. That’s probably the culprit here — if it’s an actual date with a month and day, it’s not going to match what you are getting from date(‘Y’), which is just going to be ‘2018’. You can check the value in ‘date_event’ on any of … Read more
As @Sally CJ noted in the comment to your question, you should just omit the meta key: $meta = get_post_meta( $post->ID, ”, true ); echo $meta[‘car_year’]; // 2005 In PHP 7.1 you can use array destructing: [ ‘image_meta’ => $image_meta, ‘car_year’ => $car_year, ‘car_mileage’ => $car_mileage, ‘car_price’ => $car_price, ‘car_model’ => $car_model, ] = get_post_meta( … Read more