1 <?php 2 $tmp = array(); 3 echo json_encode($tmp); //打印 [] 4 echo " "; 5 echo json_encode($tmp,JSON_FORCE_OBJECT); //打印 {} 6 echo " "; 7 8 $tmp = array('a','b'); 9 echo json_encode($tmp); //打印 ["a","b"] 10 echo " "; 11 echo json_encode($tmp,JSON_FORCE_OBJECT); //打印 {"0":"a","1":"b"} 12 echo " "; 13 14 15 $tmp = array(0=>'a',3=>'b'); 16 echo json_encode($tmp); //打印 {"0":"a","3":"b"} 17 echo " "; 18 19 $tmp = array(0=>'a',1=>'b'); 20 echo json_encode($tmp); //打印 ["a","b"] 21 echo " "; 22 echo json_encode($tmp,JSON_FORCE_OBJECT); //打印 {"0":"a","1":"b"} 23 echo " "; 24 ?>
结果：
