PHP - 修改foreach循环当前对象 [英] PHP - Modify current object in foreach loop

问题描述

我不知道是否有可能编辑一个正在一个的foreach 循环内处理当前对象

我与对象 $问题的数组工作，我想通过，并期待与我的数据库这个问题对象关联的答案。因此，对于每一个问题去获取答案对象，并更新当前的 $问题 在我的的foreach 循环，这样我可以输出/过程在其他地方。

 的foreach（$问题为$问题）{
    $的问题['答案'] = $ answers_model-＆GT; get_answers_by_question_id（$问题['question_id']）;
}
 

解决方案

有这样做的2种方式。

 的foreach（$问题为重点$ = GT; $问题）{
        $问题[$关键] ['答案'] = $ answers_model-＆GT; get_answers_by_question_id（$问题['question_id']）;
    }
 

这样，您保存密钥，这样你就可以在主 $问题再次更新变量

或

 的foreach（$问题为＆放大器; $问题）{
 

添加＆安培; 将保持 $问题更新。但我要说的第一个建议，即使这是短（见Paystey评论）

PHP 的foreach 文件：

  

为了能够直接修改环路precede $值内的数组元素与＆放大器;.在这种情况下，该值将通过参照被分配

I was wondering if it is possible to edit the current object that's being handled within a foreach loop

I'm working with an array of objects $questions and I want to go through and look for the answers associated with that question object in my db. So for each question go fetch the answer objects and update the current $question inside my foreach loop so I can output/process elsewhere.

foreach($questions as $question){
    $question['answers'] = $answers_model->get_answers_by_question_id($question['question_id']);
}

解决方案

There are 2 ways of doing this

   foreach($questions as $key => $question){
        $questions[$key]['answers'] = $answers_model->get_answers_by_question_id($question['question_id']);
    }

This way you save the key, so you can update it again in the main $questions variable

or

foreach($questions as &$question){

Adding the & will keep the $questions updated. But I would say the first one is recommended even though this is shorter (see comment by Paystey)

Per the PHP foreach documentation:

In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.

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