> //`sprintf("%d","3.2")` ;//只格式化，返回格式化后的字符串，不輸出。 > //`printf("%d","3.2")` ;//即格式化，又輸出 > //`print("3.2")` ;//只輸出 > //`echo "nihao","aa";`//可以輸出多個字符串 > //`print_r(array("a","b","c"));`//將數組的鍵值與元素依次顯示