How to use render_block_context filter in WordPress

render_block_context filter

Filters the default context provided to a rendered block.

To use the render_block_context filter, you first have to register it using add_filter. You can write this code into the functions.php file 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 weplugins_modify_render_block_context_defaults which takes 3 parameters and we registered using add_filter. The first parameter render_block_context is the name of the hook, the second parameter weplugins_modify_render_block_context_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 the render_block_context filter.

Parameters

Below are the 3 parameters required to use this hook.

• $context: (array) Default context.
• $parsed_block: (array) Block being rendered, filtered by render_block_data.
• $parent_block: (WP_Block|null) If this is a nested block, a reference to the parent block.

Live Example

apply_filters( 'render_block_context', array $context, array $parsed_block, WP_Block|null $parent_block )

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

Example 1: Basic Filter Application

This example demonstrates how to modify the default block context.

    function weplugins_modify_render_block_context_defaults($context, $parsed_block, $parent_block) { 
        // Update the $context variable according to your website requirements and return this variable. You can modify the $context variable conditionally too if you want.
        return $context; 
    }
    // add the filter
    add_filter( "render_block_context", "weplugins_modify_render_block_context_defaults", 10, 3 );
    

Example 2: Conditional Context Modification

This example shows how to modify the context conditionally based on block type.

    function weplugins_modify_render_block_context_conditionally($context, $parsed_block, $parent_block) {
        if ($parsed_block['blockName'] === 'core/paragraph') {
            $context['custom_data'] = 'This is a paragraph block';
        }
        return $context;
    }
    // add the filter
    add_filter( "render_block_context", "weplugins_modify_render_block_context_conditionally", 10, 3 );
    

Example 3: Removing the Filter

To remove a hook callback, use the example below.

remove_filter( "render_block_context", "weplugins_modify_render_block_context_defaults", 10, 3 );

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

Contact Us

If you need customization or are having any trouble using this hook, please contact us and we’d be happy to assist you.