multiplier function v0.0.3

<?php

// Utility function to change the prices with a multiplier (number)
function get_price_multiplier() {
    return 0.917; // x2 for testing
}

// Simple, grouped and external products
add_filter('woocommerce_product_get_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_get_regular_price', 'custom_price', 99, 2 );
// Variations
add_filter('woocommerce_product_variation_get_regular_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_variation_get_price', 'custom_price', 99, 2 );
function custom_price( $price, $product ) {

$user = wp_get_current_user();

if ( in_array( 'administrator', (array) $user->roles ) || in_array( 'student', (array) $user->roles )) {
    $price = $price * get_price_multiplier();}else{
    $price = $price;}

    return (float) $price;
}

// Variable (price range)
add_filter('woocommerce_variation_prices_price', 'custom_variable_price', 99, 3 );
add_filter('woocommerce_variation_prices_regular_price', 'custom_variable_price', 99, 3 );
function custom_variable_price( $price, $variation, $product ) {
    // Delete product cached price  (if needed)
    wc_delete_product_transients($variation->get_id());

$user = wp_get_current_user();

if ( in_array( 'administrator', (array) $user->roles ) || in_array( 'student', (array) $user->roles )) {
    $price = $price * get_price_multiplier();}else{
    $price = $price;}

    return (float) $price;
}

//Hide Price Range for WooCommerce Variable Products
add_filter( 'woocommerce_variable_sale_price_html',
'variable_product_price', 10, 2 );
add_filter( 'woocommerce_variable_price_html',
'variable_product_price', 10, 2 );

function variable_product_price( $v_price, $v_product ) {

// Product Price
$prod_prices = array( $v_product->get_variation_price( 'min', true ),
                            $v_product->get_variation_price( 'max', true ) );
$prod_price = $prod_prices[0]!==$prod_prices[1] ? sprintf(__('%1$s', 'woocommerce'),
                       wc_price( $prod_prices[0] ) ) : wc_price( $prod_prices[0] );

// Regular Price
$user = wp_get_current_user();

if ( in_array( 'administrator', (array) $user->roles ) || in_array( 'student', (array) $user->roles )) {
$regular_prices = array( $v_product->get_variation_regular_price( 'min', true ),
                          $v_product->get_variation_regular_price( 'max', true ) );
$og_price = $regular_prices[0] / 0.917;
sort( $regular_prices );

$regular_price = $regular_prices[0]!==$regular_prices[1] ? sprintf(__('%1$s','woocommerce')
                      , wc_price( $og_price ) ) : wc_price( $og_price );
}else{
$regular_prices = array( $v_product->get_variation_regular_price( 'min', true ),
                          $v_product->get_variation_regular_price( 'max', true ) );
sort( $regular_prices );

$regular_price = $regular_prices[0]!==$regular_prices[1] ? sprintf(__('%1$s','woocommerce')
                      , wc_price( $regular_prices[0] ) ) : wc_price( $regular_prices[0] );
}

if ( $prod_price !== $regular_price ) {
$prod_price = '<del>'.$regular_price.$v_product->get_price_suffix() . '</del> <ins>' .
                       $prod_price . $v_product->get_price_suffix() . '</ins>';
}
return $prod_price;
}