我无法尝试使用数据库中的值从数组中删除空值。这些空值通常在'答案'中找到。代码如下:删除数组中的空值
$getQuestions = mysql_logging_query("SELECT fq.`question_id`, fq.`ques_form_id`, fq.`question_body`, fq.`type`, fq.`answer1`, fq.`answer2`, fq.`answer3`, fq.`answer4`, fq.`answer5`, fq.`answer6`, fq.`min_validation`, fq.`max_validation`
FROM QuestionnaireFormQuestions fq
LEFT JOIN QuestionnaireForms f
ON f.`form_id` = fq.`ques_form_id`
WHERE f.`active` = 1
AND f.`form_id` = '".mysql_real_escape_string($form_id,$this->dbcon)."'
",$this->dbcon);
if($getQuestions && mysql_num_rows($getQuestions)>0 && mysql_error($this->dbcon)=="")
{
$get_questions_array = array();
while($getQuestions && $getQuestions_rec=mysql_fetch_assoc($getQuestions))
{
$get_questions_array[] = array('question_id' => $getQuestions_rec['question_id'],
'related_form_id' => $getQuestions_rec['ques_form_id'],
'question_body' => $getQuestions_rec['question_body'],
'question_type' => $getQuestions_rec['type'],
'possible_answer1' => $getQuestions_rec['answer1'],
'possible_answer2' => $getQuestions_rec['answer2'],
'possible_answer3' => $getQuestions_rec['answer3'],
'possible_answer4' => $getQuestions_rec['answer4'],
'possible_answer5' => $getQuestions_rec['answer5'],
'possible_answer6' => $getQuestions_rec['answer6'],
'min_validation' => $getQuestions_rec['min_validation'],
'max_validation' => $getQuestions_rec['max_validation']
);
}
if(is_array($get_questions_array) && count($get_questions_array)>0)
{
foreach($get_questions_array as $key=>$array)
{
if($array === null) {
unset($get_questions_array[$key]);
}
$return['data']['questions'][] = $array;
}
}
}
else
//error
返回例如;看起来像这样:
"question_id":"3",
"related_form_id":"4",
"question_body":"Do you like this content?",
"question_type":"radio",
"possible_answer1":"Disagree",
"possible_answer2":"Neutral",
"possible_answer3":"Agree",
"possible_answer4":null,
"possible_answer5":null,
"possible_answer6":null,
"min_validation":"1",
"max_validation":"1"
我试过unsetting使用空和isnull的密钥,但无济于事。任何帮助,将不胜感激。
如果你想查询后做,然后使用'array_filter()'。 – 2014-11-05 13:07:23
你是否试图从返回的问题中删除空字段(即通常可能的答案)?您好像循环遍历问题并检查整个返回的数组为null,而不是遍历每个问题的字段并检查每个字段的空值。 – Kickstart 2014-11-05 13:21:46