PHP Book insteadof and as.

ConflictExample.php

<?php 
/**
 * If two traits share the same method and are both included in a class, we have a problem. Rare, but possible
 * Here's how to get around it.
 * 
 * Reference: PHP Objects, Patterns and Practice, ed 4. pp 49
 **/
 
 trait TaxTools {
    function calculateTax($price) {
      return 123;
    }   
    //More stuff.
 }
 
 trait PriceUtilities {
   private $taxRate = 0.075;
   
   function calculateTax($price) {
     return $price * (1 + $taxRate);
   }
   
   //More stuff.
 }
 
 //
 abstract class Service {
   
 }
 
 class UtilityService extends Service {
   /** Use Tax Tools' version of calculate tax rather than Price Utilities' **/

   use PriceUtilities, TaxTools {
     TaxTools::calculateTax instead of PriceUtilities;
   }
 }
 
 /**
  * OR .... 
  */
  
   class UtilityService extends Service {
   /** Use Tax Tools' version of calculate tax rather than Price Utilities' but 
    *  cast PriceUtilities' calculateTax method as basicTax so that it can still be used
    **/

   use PriceUtilities, TaxTools {
     TaxTools::calculateTax instead of PriceUtilities;
     PriceUtilities::calculateTax as basicTax;
   }
 }