How to use render_block_this-name filter in WordPress

render_block_this-name filter

The dynamic portion of the hook name, $name, refers to the block name, e.g. “core/paragraph”.

To use render_block_this-name filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at WePlugins always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_render_block_this-name_defaults which takes 3 parameters and we registered using add_filter. The first parameter render_block_this-name is the name of the hook, the second parameter modify_render_block_this-name_defaults is the name of the function which needs to be called, the third parameter is the priority of calling the hook if the same hook is used multiple times, and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometimes, you have to remove a registered hook, so you can use remove_filter to remove render_block_this-name filter.

Parameters

Below are the 3 parameters required to use this hook:

• $block_content: (string) The block content about to be appended.
• $block: (array) The full block, including name and attributes.
• $instance: (WP_Block) The block instance.

Live Example

apply_filters( "render_block_{$this->name}", string $block_content, array $block, WP_Block $instance )

Below is an example of how you can use this hook:

Example 1: Modifying Block Content

This example demonstrates how to modify the block content before it gets rendered.

    function weplugins_modify_render_block_this_name_defaults($block_content, $block, $instance) { 
        // Update the $block_content variable according to your website requirements and return this variable. You can modify the $block_content variable conditionally too if you want.
        return $block_content; 
    }
    // add the filter
    add_filter( "render_block_this-name", "weplugins_modify_render_block_this_name_defaults", 10, 3 );
    

Example 2: Conditional Modification

This example shows how you can conditionally modify the block content based on block attributes.

    function weplugins_conditional_render_block_this_name_defaults($block_content, $block, $instance) {
        if ($block['name'] === 'core/paragraph') {
            $block_content .= '<p>This is additional content for paragraphs!</p>';
        }
        return $block_content;
    }
    // add the filter
    add_filter( "render_block_this-name", "weplugins_conditional_render_block_this_name_defaults", 10, 3 );
    

Example 3: Removing a Hook Callback

To remove a hook callback, use the example below.

    // remove the filter
    remove_filter( "render_block_this-name", "weplugins_modify_render_block_this_name_defaults", 10, 3 );
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.