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<?php

add_action( 'init', 'ninja_forms_register_display_form_visibility', 99 );
function ninja_forms_register_display_form_visibility(){
    add_filter( 'ninja_forms_display_form_visibility', 'ninja_forms_display_form_visibility', 10, 2 );
}

function ninja_forms_display_form_visibility( $display, $form_id ){
    global $ninja_forms_processing;

    $form_row = ninja_forms_get_form_by_id( $form_id );
    $form_data = $form_row['data'];

    if( is_object( $ninja_forms_processing ) ){
        $hide_complete = $ninja_forms_processing->get_form_setting( 'hide_complete' );
    }else{
        if( isset( $form_data['hide_complete'] ) ){
            $hide_complete = $form_data['hide_complete'];
        }else{
            $hide_complete = 0;
        }
    }

    //If the plugin setting 'hide complete' has been set and a success message exists, hide the form.
    if( $hide_complete == 1 AND ( is_object( $ninja_forms_processing ) AND $ninja_forms_processing->get_form_setting( 'processing_complete' ) == 1 ) AND $ninja_forms_processing->get_form_ID() == $form_id ){
        $display = 0;
    }

    return $display;
}