Woocommerce Shipping - Hide standard Shipping Methods when free (local delivery) is available

function.php

/* Woocommerce Shipping */

// Hide standard shipping when free is available
// Original script https://gist.github.com/pauloiankoski/9707209
add_filter( 'woocommerce_available_shipping_methods', 'mf_hide_standard_shipping_when_free_is_available' , 10, 1 );

function mf_hide_standard_shipping_when_free_is_available( $available_methods ) {
 global $woocommerce;

// First the free shipping method is only available to local delivery
// This script works on this way: The local delivery methos identify when the free shipping is available and this identify the 

// remove free shipping if local delivery is no available
/*if ( ! isset( $available_methods['local_delivery'] ) ){
		unset( $available_methods['free_shipping'] );
}*/

// Define a fixed minimum value to free local shipping method

// if total < 100 R$ the local delivery is available
if( $woocommerce->cart->cart_contents_total < 100 AND isset( $available_methods['local_delivery'] ) ) {
	 // remove local delivery
  unset( $available_methods['local_delivery'] );

// if total >= 100 and local delivery is available
} elseif( $woocommerce->cart->cart_contents_total >= 100 AND isset( $available_methods['local_delivery'] ) ) {
  // remove correios method
  unset( $available_methods['PAC'] );
  unset( $available_methods['SEDEX'] );
}
  return $available_methods;
}