Laravel validator 'in' issue for numbers in input - php

Question

I need help in fixing an issue in which I am using laravel 'in' validator to match a given input against multiple comma separated string of values. Now the issue is when there is a number in the input and it does not matches with any of the comma separated values then it gives an exception:
preg_match() expects parameter 2 to be string, array given
However it should simply give error message in validator object that input field does not match. instead it gives above mentioned exception. Following is my code:
if (!empty($program)) {
$institution_id = $program->InstitutionId;
$roster_users = $program->usersRosters()->where('ProfileType', 'Student')->get();
if (!empty($roster_users)) {
$rostered_users_ids = implode(',', $roster_users->lists('id'));
}
if (!empty($roster_users)) {
$rostered_users_usernames = implode(',', $roster_users->lists('UserName'));
}
$teacher_roster_users = $program->usersRosters()->where('ProfileType', 'External Staff')->get();
if (!empty($teacher_roster_users)) {
$teacher_rostered_users_usernames = implode(',', $teacher_roster_users->lists('UserName'));
}
if (!empty($teacher_roster_users)) {
$teacher_rostered_users_data = $teacher_roster_users->lists('id', 'UserName');
}
}
$rules = [
'aasectionname.required' => '501 – AA section does not exist',
'aaid' => 'numeric|exists:users,id|in:' . $rostered_users_ids . '|aaidinstitutionmismatch:' . $institution_id,
'institutionid' => 'numeric|in:' . $institution_id,
'username' => 'exists:users,UserName|in:' . $rostered_users_usernames . '|usernameinstitutionmismatch:' . $institution_id,
'schoolid' => 'numeric',
'groupowner' => 'in:'.$teacher_rostered_users_usernames,
'remove' => 'in:0,1'
];
$messages = [
// InstitutionId
'institutionid.numeric' => '101 – Invalid Institution ID',
'institutionid.in' => '102 – Institution ID does not match Program',
// Usernames
'username.exists' => '201 – UserName does not exist',
'username.in' => '202 – UserName is not rostered to this program',
'username.usernameinstitutionmismatch' => '203 – User/Institution Mismatch - UserName is not assigned to this Institution',
// AAId
'aaid.numeric' => '301 – AA ID does not exist',
'aaid.exists' => '301 – AA ID does not exist',
'aaid.in' => '302 – AA ID is not rostered to this program',
'aaid.aaidinstitutionmismatch' => '303 – AA ID/Institution Mismatch – AAID is not assigned to this Institution',
// Mismatch
'bothmismatch' => '401 – AAID/UserName/SchoolID do not match (This is a combination of at least 2 of these items)',
// Teacher
'groupowner.in' => '501 – GroupOwner does not exist',
// Remove
'remove' => '601 – No Student record match to remove',
];
Excel::load($file, function($excel) use($program, $rules, $messages, $errors, &$errors_data, $teacher_rostered_users_data) {
global $totalmismatch;
$results = $excel->get();
$program_group_model = new ProgramGroup;
$option_model = new Option;
$group_default_status_id = key($option_model->getProgramsStatus(['Active']));
$groupVisibilityStatusId = $group_type = $option_model->getVisibilityOptions('Question Visibility','Private');
$data = [];
$lastSecId = null;
$groupSectionPreviousName = null;
$groupname = null;
$data['status'] = $group_default_status_id;
$data['program_id'] = $program->Id;
$groupname_lists = $program_group_model->with(['programs' => function ($query) use ($program){
$query->where('ProgramId','=',$program->Id);
}])->get()->lists('Name','Id');
foreach ($results as $key => $row) {
$inputs = $row->toArray();
$groupname = trim($inputs['usergroup']);
$errors = [];
// Stop reading the excel when aasectionname is empty
if (empty($groupname) || $groupname == null) {
$errors['remove'] = $messages['aasectionname.required'];
}
$validator = Validator::make($inputs, $rules, $messages);
if ($validator->fails()) {
$errors = $validator->messages()->toArray();
foreach ($errors as $error) {
foreach ($error as $e) {
$errors_data[] = [$key + 2, $e];
}
}
} else {
$aaid = intval($inputs['aaid']);
$groupowner_name = $inputs['groupowner'];
if (!empty($teacher_rostered_users_data[$groupowner_name])) {
$groupowner_id = $teacher_rostered_users_data[$groupowner_name];
$data['owner'] = $groupowner_id;
}
$remove = intval($inputs['remove']);
// Remove existing Student Roster
if (!empty($remove)) {
$removed = false;
$user_ids = is_array($aaid) ? $aaid : [$aaid];
$program_group = $program->programGroups()->where('Name', $groupname);
if (!empty($program_group)) {
$program_group = $program_group->first();
}
if (!empty($program_group)) {
$program_group = $program_group->users();
}
if (!empty($program_group) && !empty($user_ids)) {
$removed = $program_group->detach($user_ids);
}
if (!$removed) {
$errors['remove'] = $messages['remove'];
}
} else {
if (!in_array($groupname, $groupname_lists) || $groupSectionPreviousName != $groupname) {
$data['name'] = $groupname;
$data['group_id'] = array_search($groupname, $groupname_lists);
$data['group_type'] = $groupVisibilityStatusId;
$sectionId = $program_group_model->saveProgramGroup($data);
$data[$sectionId]['selected'][] = $aaid;
$groupname_lists[$sectionId] = $groupname;
} else {
$temp = array_flip($groupname_lists);
$data[$temp[$groupname]]['selected'][] = $aaid;
}
}
if ($totalmismatch === 2) {
$errors['bothmismatch'] = $messages['bothmismatch'];
}
foreach ($errors as $error) {
$errors_data[] = [$key + 2, $error];
}
}
$groupSectionPreviousName = $groupname;
}
$programAASectionModelForSectionUsers = new ProgramSectionUser();
$programAASectionModelForSectionUsers->saveProgramGroupUsers($data);
});
$rules
array:7 [
"aasectionname.required" => "501 – AA section does not exist"
"aaid" => "numeric|exists:users,id|in:28,29,32,33,25,24,27|aaidinstitutionmismatch:42"
"institutionid" => "numeric|in:42"
"username" => "exists:users,UserName|in:Kabeer,Ayaz,fddesaaweqq,fdawerascvdfc,haseeb,kamran,shahid|usernameinstitutionmismatch:42"
"schoolid" => "numeric"
"groupowner" => "in:externalstaff,rahat,uzma,sahar,haseebahmad,saimariaz,fredrick"
"remove" => "in:0,1"
]