How to customize the WordPress comment form

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WordPress’s default comment box comes with Comment, Name, Email, Website & Cookie consent fields. If we want to replace the website field with a mobile number field we can do that like this:

function bcloud_update_comment_form_field($fields) {
        // We need to move cookies field after the phone field
	$cookies_value = $fields['cookies'];

	$fields[ 'phone' ] = '<p class="comment-form-phone">'.
      '<label for="phone">' . __( 'Mobile Number' ) . '</label>'.
      '<input id="phone" name="phone" type="text" size="30"  tabindex="4" /></p>';

        // if you wanted to replace cookies field text
	$cookies_value = str_replace('website in', 'mobile number in', $cookies_value);
	$fields['cookies'] = $cookies_value;
        return $fields;
add_filter('comment_form_default_fields', 'bcloud_update_comment_form_field');

Important links – comment_form_default_fields – hook

If we also want to change the before form comment, we can do this like this:

// Add or edit the notes before the comments form
add_filter( 'comment_form_defaults', 'bcloud_update_comment_form_before' );

function bcloud_update_comment_form_before( $defaults ) {
	$defaults['title_reply'] = __( 'Add a Comment' );
	$defaults['comment_notes_before'] = '<p class="comment-notes">Your email address and mobile number will not be published. Required fields are marked <span class="required">*</span></p>';
	return $defaults;

Important links – comment_form_defaults – hook, Difference between “comment_form_default_fields” AND “comment_form_fields”

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