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How to use comment_form_submit_button filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
July 12, 2022
5 minutes read

comment_form_submit_button filter

Filters the submit button for the comment form to display.

To use comment_form_submit_button 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 Flipper Code, 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_comment_form_submit_button_defaults which takes 2 parameters and we registered using add_filter. The first parameter comment_form_submit_button is name of the hook, The second parameter modify_comment_form_submit_button_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove comment_form_submit_button filter.


    Below are the 2 parameters are required to use this hook.

  • $submit_button : (string) HTML markup for the submit button.
  • $args : (array) Arguments passed to comment_form().

Live Example

// define the comment_form_submit_button callback
function filter_comment_form_submit_button( $submit_button, $args ) {
    // make filter magic happen here...
    $submit_before = '<div class="form-group">';
    $submit_after = '</div>';
    return $submit_before . $submit_button . $submit_after;
 // add the filter
add_filter( 'comment_form_submit_button', 'filter_comment_form_submit_button', 10, 2 );

Below is an example how you can use this hook.

                        function modify_comment_form_submit_button_defaults($submit_button, $args) { 
                            // Update the $submit_button variable according to your website requirements and return this variable. You can modify the $submit_button variable conditionally too if you want.

                            return $submit_button; 
                        // add the filter
                        add_filter( "comment_form_submit_button", "modify_comment_form_submit_button_defaults", 10, 2 );

To remove a hook callback, use the example below.

remove_filter( "comment_form_submit_button", "modify_comment_form_submit_button_defaults", 10, 2 );

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

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.

Sandeep Kumar Mishra

Sandeep Kumar Mishra writes about WordPress and Artificial Intelligence, offering tips and guides to help you master your website and stay updated with the latest tech trends.

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