McDonald's Corp. said Monday its second-quarter earnings will top analysts' expectations thanks to a strong showing by its European restaurants and increased U.S. breakfast sales that combined to boost June sales. The news pushed its stock up more than 5 percent. The world's largest restaurant company posted a 5.9 percent increase in worldwide same-store sales last month, including 5.2 percent in the United States and 4.5 percent in Europe, the two markets where a majority of its outlets are located.