comment_form_fields

/**
 * Move the comment text field to the bottom.
 *
 * @see 	https://docs.gechiui.com/hooks/comment_form_fields/
 * @param  	array  $fields 		The comment fields..
 * @return 	array
 */
function prefix_move_comment_field_to_bottom( $fields ) {

	$comment_field = $fields['comment'];
	unset( $fields['comment'] );
	$fields['comment'] = $comment_field;
	return $fields;

}
add_filter( 'comment_form_fields',      'prefix_move_comment_field_to_bottom', 10, 1 );

add_filter( 'comment_form_fields', 'custom_comment_field' );
function custom_comment_field( $fields ) {
    // What fields you want to control.
    $comment_field = $fields['author'];
    $comment_field = $fields['email'];
    $comment_field = $fields['comment'];
    $comment_field = $fields['cookies'];

    // The fields you want to unset (remove).
    unset($fields['author']);
    unset($fields['email']);
    unset($fields['url']);
    unset($fields['comment']);
    unset($fields['cookies']);

    // Display the fields to your own taste.
    // The order in which you place them will determine in what order they are displayed.
    $fields['author'] = '<p class="comment-form-author"><label for="author">Name <span class="required">*</span></label><input type="text" id="author" name="author" require="required" placeholder="Name"></p>';
    $fields['email'] = '<p class="comment-form-email"><label for="email">Email <span class="required">*</span></label><input type="text" id="email" name="email" require="required" placeholder="Email"></p>';
    $fields['comment'] = '<p class="comment-form-comment"><label for="comment">Comment <span class="required">*</span></label><textarea id="comment" name="comment" required="required" placeholder="Comment"></textarea></p>';
    $fields['cookies'] = '<p class="comment-form-cookies-consent"><input id="gc-comment-cookies-consent" name="gc-comment-cookies-consent" type="checkbox" value="yes"><label for="gc-comment-cookies-consent">Save details for future comments?</label></p>';
    return $fields;
}