php - <sup> and <sub> tags displaying in Webpage -


i working on project hosts online exams students, , few chemistry questions when trying display subscripts , superscripts formulas , displaying tags in webpage follows, using codeigniter framework this.

    //get exam question details including subjects (subjects quiz/exam)     $quizrecords = $this->base_model->run_query(     "select q.*,qq.*,s.subjectid,s.name subjectname "     .$this->db->dbprefix('quiz')." q, ".$this->db->dbprefix('quizquestions')     ." qq, ".$this->db->dbprefix('subjects')." s      qq.quizid=q.quizid , qq.subjectid=s.subjectid , q.quizid=".$id     );     $questarray = array();     foreach ($quizrecords $r) {         $subjectwisequestions = $this->base_model->run_query(         "select * ".$this->db->dbprefix('questions')         ." subjectid=".$r->subjectid." , difficultylevel='"         .$r->difficultylevel."' , answer1!='' , answer2!=''          , correctanswer!='' order rand() limit ".$r->totalquestion         );         array_push($questarray, $subjectwisequestions);              }

the question displays follows: energy of electron in hydrogen atom given e=13.6/n2 ev. 1 of following statement true if n changed 1 4 ?

should use html_entity_decode? if yes, suitable place put here in code? appreciated


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