Title: Extending a function Last modified: February 5, 2024 --- # Extending a function * [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/) * How can I insert this: * ```wp-block-code cat_name . ' '; } ?> ``` * to this: * ```wp-block-code add_shortcode('incipit', 'translate_incipit'); function translate_incipit() { global $post; $german = get_post_meta( $post->ID, 'incipit_de', true ); if ( 'de_DE' == get_locale() && ! empty( $german )){ return $german; } else { return get_post_meta( $post->ID, 'incipit_it', true ); } } ``` * what I want to do is having the category name printed before the value of “get_post_meta”, having in mind that I should print the name of the category eventually translated * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fextending-a-function%2Fpage%2F2%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 15 replies - 16 through 30 (of 43 total) [←](https://wordpress.org/support/topic/extending-a-function/?output_format=md) [1](https://wordpress.org/support/topic/extending-a-function/?output_format=md) 2 [3](https://wordpress.org/support/topic/extending-a-function/page/3/?output_format=md) [→](https://wordpress.org/support/topic/extending-a-function/page/3/?output_format=md) * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17420590) * yes, I didnt want to have just one “get_post_meta”, I’ll have one for the category terms and one for the taxonomy terms, but I cant understand your “Whatever the name, you need to get the term assigned to the current post. You can do that with [wp_get_post_terms()](https://developer.wordpress.org/reference/functions/wp_get_post_terms/). Note that an array of term objects are returned, even if there is only one term assigned to the post. So you’d need to extract the first element (index `[0]`) out of the array before using its term_id property.” * So I dont know what I should add to * `get_post_meta( $post->ID, 'description_'.$lang, true );` * to make it visible * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17422207) * Concatenate the return value from get_post_meta() to whatever else you want the shortcode to display. Concatenate to the variable your code eventually returns in the end. * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17423883) * I think the following code cant work * ```wp-block-code add_shortcode('description', 'translate_desc'); function translate_desc() { global $post; $lang = substr( get_locale(), 0, 2); $content = get_post_meta( $post->ID, 'description_'.$lang, true ); return $output .= get_term_meta( $category->term_id, 'category_'.$lang, true) . get_term_meta( $category->term_id, 'tipologia_'.$lang, true) .' '. $content; } ``` * Because I dont have a field “tipologia_de”, neither a “category_de”. I tryed to change my field for category in german into “category_de” but I should have done a lot of faults because I could even see the field, I worked on * ```wp-block-code add_action( 'category_edit_form_fields', "category_add_term_field"); function category_add_term_field( $term ){ $category = get_term_meta( $term->term_id, 'function_category', true ); echo '

Nome del termine in tedesco

'; } add_action( 'saved_category', 'update_category'); function update_category ( $term_id ) { update_term_meta( $term_id, 'function_category', sanitize_text_field ( $_POST['function_category'] ) ); } ``` * Everywhere I see “category” I replace by “category_de”, this should be simple but… * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17424123) * Or also in the shortcode should I use archive_de? So that I would syncronize the search box terms with the archive title filter: [https://pastebin.com/Xid3M1Ua](https://pastebin.com/Xid3M1Ua) * This filter in particular is for the category * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17425966) * Looks like you’re currently saving under the key “function_category”, but when you add other languages everything will work much better with “_de” appended ( or whatever the current language is aside from the default Italian, “_en”, “_fr”, etc. * In order to change over to “category_de”, tipologia_de”, “category_en”, etc., first modify the input and saving code. Change all instances of “function_category” to “category_de”. Similar for the Tipologia taxonomy terms. If “archive_de” works better for you, then use that instead. I’ve not been able to keep track of what meta keys you use for what so I cannot judge which is better. What matters is having a language suffix and being consistent in whatever names you decide to use. * To update all the meta data you’ve already input, use the Better Search and Replace plugin. Search the meta tables for all instances of “function_category” and replace with “category_de” or whatever you decide to use. * To get the shortcode working after the above changes, I think all you need to do is change `$content` to `$output`. * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17427159) * Ok, I’ve been able to pass from “function_category” to “category_de”, I wonder why my modified shortcode doesnt work about category terms: * ```wp-block-code add_shortcode('description', 'translate_desc'); function translate_desc() { global $post; $lang = substr( get_locale(), 0, 2); $content = get_post_meta( $post->ID, 'description_'.$lang, true ); return $output .= get_term_meta( $category->term_id, 'category_'.$lang, true) .' '. $content; } ``` * I cant get the “get_term_meta” printed * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17428745) * Remove this part of the return line: `$output .=`. It serves no purpose and causes an undefined variable $output error. * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17428865) * I eliminated it but get_term_meta is still invisible 🙁 * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17431973) * $category is undefined. Try adding: `$category = wp_get_post_category( $post- >ID )[0];` * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 4 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17432001) * This breaks the site * ```wp-block-code add_shortcode('description', 'translate_desc'); function translate_desc() { global $post; $lang = substr( get_locale(), 0, 2); $category = wp_get_post_category( $post->ID )[0]; $content = get_post_meta( $post->ID, 'description_'.$lang, true ); return $output .= get_term_meta( $category->term_id, 'category_'.$lang, true) .' '. $content; } ``` * but also * ```wp-block-code add_shortcode('description', 'translate_desc'); function translate_desc() { global $post; $lang = substr( get_locale(), 0, 2); $category = wp_get_post_category( $post->ID )[0]; $content = get_post_meta( $post->ID, 'description_'.$lang, true ); return $output .= $category .' '. $content; } ``` * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17433170) * Remove this part of the return line: `$output .=`. It serves no purpose and causes an “undefined variable $output” error. * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17433293) * I did but the layout is broken. I tryed both the above codes without `$output. =` * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17434509) * There’s no `wp_get_post_categpory()` function, it’s `wp_get_post_categories()`. * Getting the zeroth element with `[0]` (assigned to $category) gets us a WP_Term object. You cannot return an object from a shortcode handler, you have to extract out a string property. Like this: `return $category->name .' '. $content;` * Thread Starter [sacconi](https://wordpress.org/support/users/sacconi/) * (@sacconi) * [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17435347) * If I do * ```wp-block-code add_shortcode('description', 'translate_desc'); function translate_desc() { global $post; $lang = substr( get_locale(), 0, 2); $category = wp_get_post_categories( $post->ID )[0]; $content = get_post_meta( $post->ID, 'description_'.$lang, true ); return $category.' '. $content; } ``` * “$category” returns a number, if i replace “$category” by “$category->name” I get nothing, neither deleting the [0] * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/2/#post-17436975) * I see, you’re just getting a category ID. The doc page is a little misleading about what is returned. The doc page also says: * > The results from wp_get_post_categories() aren’t cached which will result in > a database call being made every time this function is called. Use this function > with care. For performance, functions like get_the_category() should be used > to return categories attached to a post. * That’s good advice, if you use get_the_category() instead you’ll get an array of term objects like I was expecting. Despite “get_the_category” using the singular form of category, it does indeed return an array multiple categories if they exist. So you do still need the `[0]` part afterwards. Viewing 15 replies - 16 through 30 (of 43 total) [←](https://wordpress.org/support/topic/extending-a-function/?output_format=md) [1](https://wordpress.org/support/topic/extending-a-function/?output_format=md) 2 [3](https://wordpress.org/support/topic/extending-a-function/page/3/?output_format=md) [→](https://wordpress.org/support/topic/extending-a-function/page/3/?output_format=md) The topic ‘Extending a function’ is closed to new replies. ## Tags * [php](https://wordpress.org/support/topic-tag/php/) * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/) * 43 replies * 2 participants * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/) * Last activity: [2 years, 3 months ago](https://wordpress.org/support/topic/extending-a-function/page/3/#post-17453737) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics