提供此数组时，我正尝试使用insert_batch将其插入到表中。
$arrayOfQuestions包含多个数组，如下所示：
Array
(
[0] => Array
(
[question_desc] => In human beings, partial pressure of carbon dioxide in the inspired and expired air is respectively
[option_a] => 0.3 and 40 mm Hg
[option_b] => 0.3 and 32 mm Hg
[option_c] => 40 and 46 mm Hg
[option_d] => 40 and 0.3 mm Hg
[answer] => B
[diff_level] => 4
[solution] => Refer answer.
[chapter_id] => 54
[inst_id] => 1
[subject_id] => 68
[ref_q_id] => 8540371983
)
[1] => Array
(
[question_desc] => At high altitude, RBCs of human blood will
[option_a] => Increase in number
[option_b] => Decrease in number
[option_c] => Decrease in size
[option_d] => Increase in size
[answer] => A
[diff_level] => 2
[solution] => At higher altitudes, due to low pressure of atmospheric oxygen, the body has to carry more oxygen than normal in per volume of blood to supply the body constantly. The increased number of RBC in blood ensures the presence of more haemoglobin and thus more oxygen is carried.
[chapter_id] => 54
[inst_id] => 1
[subject_id] => 68
[ref_q_id] => 8540371983
)
)
我在下面尝试的代码中得到了返回true，但数据未插入表。。
$result = $this->db->insert_batch('test_temp_question', $arrayOfQuestions);
为其成功插入数据使用条件：
if($result>0){
echo"successfull.";
}
else{
echo"not successfull";
}