Gravity Forms - Move Progress Bar to Bottom of Form

gravity-forms-move-progress-bar-bottom.php

<?php
/**
* Plugin Name: Gravity Forms: Move Progress Bar to Bottom of Form
* Plugin URI: http://www.n7studios.co.uk
* Version: 1.0.0
* Author: n7 Studios
* Author URI: http://www.n7studios.co.uk
* Description: Moves the progress bar from the top to the bottom of the Gravity Form.  The Start Paging section of the form MUST have a CSS class = progress-bar-bottom
*/

/**
* Moves the progress bar from the top to the bottom of the Gravity Form
* if the Start Paging section of the form has a CSS class = progress-bar-bottom
*
* @since 1.0.0
*
* @param string $form_string    Form HTML
* @param array  $form Gravity   Form Configuration
* @return string                Form HTML
*/
function gravity_forms_move_progress_bar( $form_string, $form ) {

    // Check if Pagination is enabled on this form
    if ( ! is_array( $form['pagination'] ) ) {
        return $form_string;
    } 
    if ( empty( $form['pagination']['type'] ) ) {
        return $form_string;
    }

    // Check if the first page CSS class is progress-bar-bottom
    if ( ! isset( $form['firstPageCssClass'] ) ) {
        return $form_string;
    }
    if ( $form['firstPageCssClass'] != 'progress-bar-bottom' ) {
        return $form_string;
    }

    // If here, the progress bar needs to be at the end of the form
    // Load form string into DOMDocument
    $dom = new DOMDocument;
    @$dom->loadHTML( $form_string );

    // Load Xpath
    $xpath = new DOMXPath( $dom );

    // Find Progress Bar
    $progress_bar = $xpath->query( '//div[@class="gf_progressbar_wrapper"]' )->item(0);

    // Find Form
    $form = $xpath->query( '//form' )->item(0);

    // Move Progress Bar to end of the Form
    $form->appendChild( $progress_bar );

    // Get HTML string
    $form_string = $dom->saveHTML();

    // Return modified HTML string
    return $form_string;

}
add_filter( 'gform_get_form_filter', array( $this, 'gravity_forms_move_progress_bar' ), 10, 3 );

@decaySmash thank you for your comment

In my case works, when changing line 35 to

    if ( strpos($form['firstPageCssClass'], 'progress-bar-bottom' ) !== false) {
        return $form_string;
    }