Why does this code take a long time to execute? - php

Question

I would appreciate some guidance on the following issue. I am by no means an expert in php. The code below takes almost 10 seconds to execute! Is there anything I am doing that is wrong or bad practice?
$data = [];
$today = date("Y/m/d");
$ThisYear = Date('Y'); //get current Year
$ThisMonth = Date('m'); //get current month
$Tday = '01'; //first day of month
$Tmonth = '09'; //September
if (8 < $ThisMonth && $ThisMonth < 13) {
$AcYear = $ThisYear; }
else {
$AcYear = $ThisYear - 1; // sets start of academic year to be last year
}
$AcFullYear = $AcYear.'/'.$Tmonth.'/'.$Tday;
//find rank in all school
$students_rank = [];
$school_id = Student::model()->findByAttributes(['user_master_id' => Yii::app()->user->id])->school_master_id;
$criteria1 = new CDbCriteria;
$criteria1->with = array('user');
$criteria1->condition = "t.school_master_id=:school_master AND user.status ='1'";
$criteria1->params = array(':school_master' => $school_id);
$school_students_details = Student::model()->findAll($criteria1);
foreach ($school_students_details as $key => $value) {
$student_name = StudentDetails::model()->findByAttributes(['user_master_id' => $value->user_master_id]); //student details with year group
$criteria2 = new CDbCriteria;
$criteria2->with = array('homeworkMaster');
$criteria2->condition = "t.student_id=:student_id AND homeworkMaster.question_type_id<>:question_type_id";
$criteria2->params = array(':student_id' => $value->user_master_id, ':question_type_id' => 6);
$HW_assignment_track = HomeworkAssignmentTrack::model()->findAll($criteria2);
$total_HW = count((array)$HW_assignment_track);
$student_score = 0;
$student_rank = 0;
$student_total_score = 0;
$total_HW_marks = 0;
$under_deadline_HW = 0;
$criteria3 = new CDbCriteria();
$criteria3->condition = "student_id =:student_id AND status=:status AND created_at >= '$AcFullYear' AND created_at <= '$today'";
$criteria3->params = [':student_id' => $value->user_master_id, ':status' => 2];
$student_completed_HW = HomeworkStudentAnswere::model()->findAll($criteria3);
$i = 1;
foreach ($student_completed_HW as $s_c_h_K => $s_c_h_V) {
if ($s_c_h_V->homework->homework_type == 2) {
$total_HW -= 1;
} elseif ($s_c_h_V->homework->homework_type == 1) {
$HW_questions = HomeworkQuestion::model()->findAllByAttributes(['homework_master_id' => $s_c_h_V->homework_id, 'status' => 1]);
foreach ($HW_questions as $qKey => $qVal) {
if ($qVal->question_type_id ==3) {
$total_HW_marks += 2;
} else {
$total_HW_marks += $qVal->marks;
}
}
$assignment = HomeworkAssignmentTrack::model()->findByAttributes(['id' => $s_c_h_V->assignment_track_id]);
$homeworks_within_validate = Assignment::model()->findByPk($assignment->assignment_id);
if ($homeworks_within_validate->valid_date === '0' && $homeworks_within_validate->deadline >= date('Y-m-d')) {
$total_HW -= 1;
}
if ($homeworks_within_validate->valid_date === '1' || (($homeworks_within_validate->valid_date === '0') && ($homeworks_within_validate->deadline >= date('Y-m-d', strtotime($s_c_h_V->created_at))) && ($homeworks_within_validate->deadline < date('Y-m-d')))) {
if ($s_c_h_V->review_status === '2') {
$student_total_score += $s_c_h_V->score;
}
}
$homework_submit = HomeworkCompleteNotification::model()->findByAttributes(['homework_id' => $s_c_h_V->homework_id, 'assignment_track_id' => $s_c_h_V->assignment_track_id, 'student_id' => $value->user_master_id]);
if (($homeworks_within_validate->valid_date === '0') && ($homeworks_within_validate->deadline >= date('Y-m-d', strtotime($homework_submit->created_at))) && ($s_c_h_V->review_status === '2')) {
$under_deadline_HW += 10;
}
if ($total_HW_marks !=0) {
$student_score += round(($student_total_score / $total_HW_marks) * 100);
} else {
$student_score = 0;
}
}
$i += 1;
}
//add revision scores to rank score
$criteria4 = new CDbCriteria();
$criteria4->condition = "user_id =:user_id AND date_created >= '$AcFullYear' AND date_created <= '$today'";
$criteria4->params = [':user_id' => $value->user_master_id];
$revision_score = RevisionScores::model()->findAll($criteria4);
$sum = 0;
foreach($revision_score as $item) {
$sum += $item['score'];
} //end of adding revision scores
$students_rank[$key]['student_id'] = $value->user_master_id;
$students_rank[$key]['year_group'] = $student_name->year_group_id; //added year group to model array
if ($student_score > 0) {
$student_rank += round($student_score / $total_HW, 0) + $under_deadline_HW;
$students_rank[$key]['rank'] = $student_rank + $sum;
} else {
$students_rank[$key]['rank'] = $sum;
}
}
$model = $this->multid_sort($students_rank, 'rank');
$rank_score = round(array_column($model, 'rank', 'student_id')[Yii::app()->user->id],0);
$year_rank =[];
$current_st = StudentDetails::model()->findByAttributes(['user_master_id' => Yii::app()->user->id]);
$current_st_year = $current_st->year_group_id;
$rank_list = [];
foreach ($model as $key => $value) {
$rank_list[] = $value['student_id'];
if ($value['year_group'] == $current_st_year) {
$year_rank[] = $value['student_id'];
}
}
$user = Yii::app()->user->id;
$sch_position = array_search($user,$rank_list);
$yr_position = array_search($user,$year_rank);
$final_rank = $sch_position + 1;
$yr_rank = $yr_position + 1;
$sch_rank = $final_rank;
$ends = array('th','st','nd','rd','th','th','th','th','th','th');
if (($sch_rank %100) >= 11 && ($sch_rank%100) <= 13) {
$sc_abbreviation = 'th';
$yr_abbreviation = 'th';
} else {
$sc_abbreviation = $ends[$sch_rank % 10];
$yr_abbreviation = $ends[$yr_rank % 10];
}
$models = UserMaster::model()->findByPk(Yii::app()->user->id);
$year_name = $models->studentDetails->yearGroup->name;
$data['type'] = 'success';
$data['score'] = '<div>Ranking Score: '.$rank_score.'</div>';
$data['yr_rank'] = '<div><i class="fa fa-trophy rank-i"></i><span class="rank-number">' .$yr_rank. '</span><sup class="script-top" id="year_rank_abb">' .$yr_abbreviation. '</sup></div><div id="year_name">In ' .$year_name. '</div>';
$data['school_rank'] = '<div><i class="fa fa-trophy rank-i"></i><span class="rank-number">' .$sch_rank. '</span><sup class="script-top" id="year_rank_abb">' .$sc_abbreviation. '</sup></div><div id="year_name">In School</div>';
$data['rank_revise'] ='<div>'.$rank_score.'</div>';
$data['yr_rank_revise'] = '<span>'.$yr_rank.'</span><sup class="superscript" style="left:0">'.$yr_abbreviation.'</sup>';
$data['sch_rank_revise'] = '<span>'.$sch_rank.'</span><sup class="superscript" style="left:0">'.$sc_abbreviation.'</sup>';
$_SESSION['rank'] = $rank_score;
$_SESSION['accuracy'] = $rank_score;
echo json_encode($data);
exit;
The above is used in an Yii application. It runs perfectly fine on localhost, but on live site, takes over 10 seconds to execute.
Your help and guidance is appreciated.
Thank