只能从 foreach 循环打印的变量

Question

我想在 PHP 的 foreach 循环中获取变量，当它在 while 循环中时，我可以打印所有对象数据，但是当我在 while 循环之外回显变量时，它只打印变量的值，如何将变量声明为全局变量并在任何地方访问它们的值？

<?php
              global $answerList, $countList;
              foreach( $finalAnswer as $answerID ) {
                foreach ($answers as $ans => $answer_list) {
                  foreach ($answer_list->unique('AnswerShortID') as $answer) {
                    if ($answer->AnswerShortID === $answerID){
                        $answerList = $answer->Text;
                        $countList = $answer_list->count();
                        echo $answerList;
                    }
                  }
                }
              } 
              echo $answerList;
              
              ?>

Answer 1

您不需要global，每次循环都会覆盖变量，因此变量只包含最后一个。只需保存到数组中，以后可以循环使用或implode 显示：

              // you don't need to do this in the loop
              $countList = $answer_list->count();

              foreach ($answer_list->unique('AnswerShortID') as $answer) {
                if ($answer->AnswerShortID === $answerID){
                    $answerList[] = $answer->Text;
                }
              }

              echo implode(',', $answerList);
              //or
              foreach($answerList as $value) {
                  echo "<something>$value</something>other stuff";
              }

Answer 2

下面会将所有值存储在一个字符串中，然后您可以稍后将其回显。通过在等号之前添加一个句点，您可以在每次循环迭代时将新值添加到字符串的末尾。您的代码当前会删除最后一个值，并在每次完成循环时将其替换为新值。

<?php
          global $answerList, $countList;
          foreach( $finalAnswer as $answerID ) {
            foreach ($answers as $ans => $answer_list) {
              foreach ($answer_list->unique('AnswerShortID') as $answer) {
                if ($answer->AnswerShortID === $answerID){
                    $answerList .= $answer->Text;
                    $countList .= $answer_list->count();
                    echo $answerList;
                }
              }
            }
          } 
          echo $answerList;
          
          ?>