Question

所以我从数据库中获取对象，并且我想将id和点放在数组中。每次getIscorrect等于true时，id的值必须增加1。

$answers = array();
    $return = $this->_quizMapper->getAll();
    foreach($return as $answer){
        if($answer->getIscorrect() == true){
            if(!($answers[$answer->getID()])){
                $answers[$answer->getID()] = 1;
            }
            else{
                $newPoints = $answers[$answer->getID()] + 1;
                $answers[$answer->getID()] = $newPoints;
            }
        }
    }

但我一直在收到错误：PHP注意：未定义的索引：在这一行if(!($answers[$answer->getID()])){

Answer 1

将其更改为if (!isset($answers[$answer->getID()]))

这将取消通知。

Answer 2

这是因为没有定义密钥。

你应该使用的是：

 if(!isset($answers[$answer->getID()]) || !($answers[$answer->getID()])){

Answer 3

将您的代码更改为：

$answers = array();
$return = $this->_quizMapper->getAll();
foreach($return as $answer)
{
    if($answer->getIscorrect() == true)
    {
        if(!isset($answers[$answer->getID()]))
        {
            $answers[$answer->getID()] = 1;
        }
        else
        {
            $newPoints = $answers[$answer->getID()] + 1;
            $answers[$answer->getID()] = $newPoints;
        }
    }
}

您必须使用方法isset()来检查数组中是否存在当前密钥。

php为数组添加键值

3 个答案: