Title: core blocks Last modified: February 11, 2022 --- # core blocks * [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/) * Hello, I have been trying to apply an apply_filter like this for hours * `echo apply_filters( 'render_block', $blockContent, $block )`; * ////////////////////////////////////////////////// / ////////////////// * ``` add_filter('render_block', 'display_post_heading', 10, 2); show_post_header() function { global post $; $blocks = parse_blocks ($post->post_content); foreach ($blocks as $block) { if( 'core/heading' === $block['blockName'] ) { echo render_block($block); break; } } ``` * can someone guide me on the path of the light of worpress Viewing 11 replies - 1 through 11 (of 11 total) * Moderator [t-p](https://wordpress.org/support/users/t-p/) * (@t-p) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15356434) * I recommend asking at [https://github.com/WordPress/gutenberg/issues](https://github.com/WordPress/gutenberg/issues) * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15356545) * It’s not clear to me what you want to accomplish. You would normally use `apply_filters()` where you want to allow others to modify something your code is doing without having to directly modify your code. `render_block()` already calls `apply_filters()` for “render_block”, so why would you also do so? * If you want to modify how all blocks are rendered, you can add to the “render_block” filter to do so. It doesn’t make sense to `apply_filters()` for that. If you only wish to target a specific block, the “render_block_{$this->name}” filter would make more sense. [https://developer.wordpress.org/reference/hooks/render_block_this-name/](https://developer.wordpress.org/reference/hooks/render_block_this-name/) * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15356952) * and the {$this->name}” what is the name? the name of the osae filter would be like this? My problem is that I don’t understand how to put the apply_filter() * `echo apply_filters( "render_block_{$this->display_post_heading}", $blockContent, $block );` can you guide me please, because nothing works for me * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15358714) * I could advise better if I understood what you wish to accomplish. Without such understanding, I suspect `apply_filters()` is unlikely to accomplish what you want. I’ve been modifying what WP does for many years and have never used it. OTOH, `add_filter()` is very frequently used. * More on filter use is described in the [Plugin Handbook](https://developer.wordpress.org/plugins/hooks/filters/). * To use `"render_block_{$this->name}"`, replace `{$this->name}` with the block object’s name property where you wish to filter its rendered content. Thus you only filter a specific block instead of all blocks. * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15363418) * Hello, thanks for answering, what I want is to take the paragraph or the columns or any block of the core in `the_contet().` and so separate them or take these blocks in another html tag, I don’t want to customize them I just want to take the paragraph and put it somewhere else and`

,` and that’s how I call the paragraph but I don’t know how to do it `apply_filters(' render_block', $blockContent, $block );` you can help? * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15363425) * ///page.php ///
- ///functions.php /// - ``` function post_paragraph() { global $post; $blocks = parse_blocks( $post->post_content ); foreach( $blocks as $block ) { if( 'core/paragraph' === $block['blockName'] ) { echo render_block( $block); break; } } } ``` * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15363736) * it’s supposed to work like this `apply_filters( "render_block_{$this->post_paragraph}", $blockContent, $block );` * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15363748) * If you want to move blocks about in content, “render_block” will not help because it only operates on one block at a time and has no knowledge of surrounding context. * You could use “the_content” filter to do so though. In your filter callback use` preg_replace()` to find and extract the targeted blocks, or `explode()` the entire content into smaller elements. Insert extracted blocks elsewhere or rearrange as desired. Return the modified content. * Add your callback to “the_content” filter with `add_filter()`. No need to use` apply_filter()` at all. Do use a larger $priority arg value to give other callbacks a chance to modify content before your code has a go at it. WP will call `apply_filters()` at the appropriate time, which will cause your added callback to execute. * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15369278) * Hello, thank you very much for your help, I managed to make this variable, but I only printed the text, my question is if I do it with a gallery? * ``` $ content = get_the_content () ; if (preg_match ('~

([\ s \ S] +?)

~ ', $ content, $ matches)) echo '

' . $ matches [1] . '

' ; ``` - This reply was modified 4 years, 3 months ago by [bcworkz](https://wordpress.org/support/users/bcworkz/). Reason: code format fixed * Thread Starter [kmytort](https://wordpress.org/support/users/kmytort/) * (@kmytort) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15372103) * Hello, again me, now I have the same problem but with the media-text block . * As I can, call only the middle block – text ? * Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/) * (@bcworkz) * [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15372188) * Getting the regexp right can be tricky. Try one of regexp “fiddle” sites like regexr.com. Paste in your content as a sample, then experiment with the regexp until it captures what you want and not what you don’t want. Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘core blocks’ is closed to new replies. ## Tags * [block](https://wordpress.org/support/topic-tag/block/) * [media](https://wordpress.org/support/topic-tag/media/) * [post](https://wordpress.org/support/topic-tag/post/) * [the_content](https://wordpress.org/support/topic-tag/the_content/) * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/) * 11 replies * 3 participants * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/) * Last activity: [4 years, 3 months ago](https://wordpress.org/support/topic/core-blocks/#post-15372188) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics