<?= do_shortcode('[contact-form-7 id="111" title="blabla"]') ?>

<?php
function hidden() {

//Поля формы
$source = isset($_REQUEST['utm_source']) ? $_REQUEST['utm_source'] : '' ;
$term = isset($_REQUEST['utm_term']) ? $_REQUEST['utm_term'] : '' ;
$campaign = isset($_REQUEST['utm_campaign']) ? $_REQUEST['utm_campaign'] : '' ;
$medium = isset($_REQUEST['utm_medium']) ? $_REQUEST['utm_medium'] : '' ;
$content = isset($_REQUEST['utm_content']) ? $_REQUEST['utm_content'] : '';

$html = '<input type="hidden" name="source" class="source" id="utm_source" value="'.$source.'" />';
$html .= '<input type="hidden" name="term" class="term" id="utm_term" value="'.$term.'" />';
$html .= '<input type="hidden" name="campaign" class="campaign" id="utm_campaign" value="'.$campaign.'" />';
$html .= '<input type="hidden" name="medium" class="medium" id="utm_medium" value="'.$medium.'" />';
$html .= '<input type="hidden" name="content" class="term" id="utm_content" value="'.$content.'" />';
    return $html;
}

    wpcf7_add_form_tag('hidden', 'hidden', false);

?>

$html .= '<input type="hidden" name="city" class="wpcf7-form-control wpcf7-hidden js-city-input" value="" />';

function updateDeliveryInfo(){
    var geolocation = ymaps.geolocation;
    if(geolocation.city){
        $('.js-city-input').val(geolocation.city);
        $('.js-city').text(geolocation.city);
        $('.city').show();
    }
}

add_action( 'wpcf7_init', 'my_wpcf7_add_form_tag_hidden', 0 );

function my_wpcf7_add_form_tag_hidden() {
    remove_action( 'wpcf7_init', 'wpcf7_add_form_tag_hidden' );

    wpcf7_add_form_tag( 'hidden',
        'my_wpcf7_hidden_form_tag_handler',
        array(
            'name-attr'      => true,
            'display-hidden' => true,
        )
    );
}

function my_wpcf7_hidden_form_tag_handler( $tag ) {
    $source   = isset( $_REQUEST['utm_source'] ) ? $_REQUEST['utm_source'] : '';
    $term     = isset( $_REQUEST['utm_term'] ) ? $_REQUEST['utm_term'] : '';
    $campaign = isset( $_REQUEST['utm_campaign'] ) ? $_REQUEST['utm_campaign'] : '';
    $medium   = isset( $_REQUEST['utm_medium'] ) ? $_REQUEST['utm_medium'] : '';
    $content  = isset( $_REQUEST['utm_content'] ) ? $_REQUEST['utm_content'] : '';

    $html = '<input type="hidden" name="source" class="source" id="utm_source" value="' . $source . '" />';

    $html .= '<input type="hidden" name="term" class="term" id="utm_term" value="' . $term . '" />';
    $html .= '<input type="hidden" name="campaign" class="campaign" id="utm_campaign" value="' . $campaign . '" />';
    $html .= '<input type="hidden" name="medium" class="medium" id="utm_medium" value="' . $medium . '" />';
    $html .= '<input type="hidden" name="content" class="term" id="utm_content" value="' . $content . '" />';

    if ( empty( $tag->name ) ) {
        return $html;
    }

    $atts = array();

    $class         = wpcf7_form_controls_class( $tag->type );
    $atts['class'] = $tag->get_class_option( $class );
    $atts['id']    = $tag->get_id_option();

    $value         = (string) reset( $tag->values );
    $value         = $tag->get_default_option( $value );
    $atts['value'] = $value;

    $atts['type'] = 'hidden';
    $atts['name'] = $tag->name;
    $atts         = wpcf7_format_atts( $atts );

    $html .= sprintf( '<input %s />', $atts );

    return $html;
}