特殊字符发布TinyMCE + PHP + AJAX

Question

符号在数据库中正确保存，但在视图中显示符号时，符号无法正常显示。

保存在数据库中的数据：

<p>Symbol here is sigma : Σ</p>
<p>Symbol here is beta: β</p>
<p>Symbol here is omega: Ω</p>
<p>Symbol here is gamma: γ</p>

正在显示的数据：

Symbol here is sigma : Σ
Symbol here is beta: β
Symbol here is omega: Ω
Symbol here is gamma: γ

获取数据的代码：

public function get_questions() {
        $this->layout = false;
        if(($this->request->is('post')) && ($this->request->is('ajax'))) {
            $subject = $this->request->data['subject'];
            $chapter = $this->request->data['chapter'];
            $studentID = $this->Auth->User('PERSONROLE');
            //$phase = $subject->getPhase($subject);
            $this->Paginator->settings = array(
                'limit' => 1,
                'conditions' => array(
                    'QuestionBank.SUBJECT' => $subject, 
                    'QuestionBank.CHAPTER' => $chapter,
                    'QuestionBank.IS_ACTIVE' => 1,
                    //'QuestionBank.PHASE'
                ),
            );
            $questions = $this->paginate();
            if($questions) {
                $questions[0]['QuestionBank']['page'] = $this->request->params['paging']['QuestionBank']['page'];
                $questions[0]['QuestionBank']['current'] = $this->request->params['paging']['QuestionBank']['current'];
                $questions[0]['QuestionBank']['count'] = $this->request->params['paging']['QuestionBank']['count'];
                $questions[0]['QuestionBank']['prevPage'] = $this->request->params['paging']['QuestionBank']['prevPage'];
                $questions[0]['QuestionBank']['nextPage'] = $this->request->params['paging']['QuestionBank']['nextPage'];
                $questionID = $questions[0]['QuestionBank']['ID'];
                $selfStudyStatus = $this->_getQuestionStatus($questionID, $studentID);
                if($selfStudyStatus) {
                    $questions[0]['SelfStudyStatus'] = $selfStudyStatus['SelfStudy'];
                }

                $this->loadModel('MyNote');
                $myNote = new MyNote();
                $notes = $myNote->getPersonalNote($questionID, $studentID);
                if($notes) {
                    $questions[0]['MyNote'] = $notes['MyNote'];
                } else {
                    $questions[0]['MyNote'] = array();
                }

                $this->loadModel('Enquiry');
                $enquiry = new Enquiry();
                $enquiries = $enquiry->getEnquiries($studentID, $questionID);
                if($enquiries) {
                    $questions[0]['Enquiry'] = $enquiries;
                } else {
                    $questions[0]['Enquiry'] = array();
                }
            }
            array_walk_recursive($questions, function(&$value, $key) {
                if (is_string($value)) {
                    $value = iconv('windows-1252', 'utf-8', $value);

                }
            });
            $this->set('questions', $questions[0]);
        }
    }

请检查上面的代码，这行是“$ value = iconv（'windows-1252'，'utf-8'，$ value）;”必须对转换做点什么。 charset转换对我来说是新的。