Laravel-Excel

Hi Experts, in this code, if the candidate satisfies all four conditions. print 4 rows in excel export. but I am getting only one record for each candidate. please help to solve this.

private $data;

use Exportable;
public function __construct(array $data)
{
    $this->data = $data;
}

public function collection()
{
    $search_type = $this->data['search_type'];

    $individuals = Individual::join('users', 'users.id', '=', 'individuals.user_id')->get();
    $companies = Company::join('users', 'users.id', '=', 'companies.user_id')->get();
    $candidates = $individuals->merge($companies);

    $i = 1;  
    $j = 0; 
    $array = array();
    foreach ($candidates as $candidate) {
   
        if($candidate->compliance_visa1 != '')
        {
         
            $candidate->sno = $i++;
            $candidate->name = $candidate->first_name.' '.$candidate->last_name;
            $candidate->doc_type = 'Visa';
            $cur_date = date('d-m-Y');
            $exp_date = date('d-m-Y',strtotime($candidate->compliance_expiry));
            $d1 = date_create($cur_date);
            $d2 = date_create($exp_date);
            $diff = date_diff($d1,$d2);
            $exp_count = $diff->format("%R%a");
            if($exp_count >= +90)
            {
                $exp_status = 'Valid';
            }elseif($exp_count > +30 && $exp_count < +90)
            {
                $exp_status = 'Review and Advise';
            }elseif($exp_count <= +30)
            {
                $exp_status = 'Urgent Action Required';
            }
            $candidate->cer_expiry = $exp_date;
            $candidate->expiry_status = $exp_status;
            $array[$j] = $candidate; 
            $j++;
        }
        if($candidate->nmc_register != '')
        {
            $candidate->sno = $i++;
            $candidate->name = $candidate->first_name.' '.$candidate->last_name;
            $candidate->doc_type = 'NMC';
            $cur_date = date('d-m-Y');
            $exp_date = date('d-m-Y',strtotime($candidate->compliance_nmc_date));
            $d1 = date_create($cur_date);
            $d2 = date_create($exp_date);
            $diff = date_diff($d1,$d2);
            $exp_count = $diff->format("%R%a");
            if($exp_count >= +90)
            {
                $exp_status = 'Valid';
            }elseif($exp_count > +30 && $exp_count < +90)
            {
                $exp_status = 'Review and Advise';
            }elseif($exp_count <= +30)
            {
                $exp_status = 'Urgent Action Required';
            }
            $candidate->cer_expiry = $exp_date;
            $candidate->expiry_status = $exp_status;
            $array[$j] = $candidate; 
            $j++;
        }
        if($candidate->dbs_upload1 != '')
        {
            $candidate->sno = $i++;
            $candidate->name = $candidate->first_name.' '.$candidate->last_name;
            $candidate->doc_type = 'DBS';
            $cur_date = date('d-m-Y');
            $exp_date = date('d-m-Y',strtotime($candidate->dbs_issue));
            $d1 = date_create($cur_date);
            $d2 = date_create($exp_date);
            $diff = date_diff($d1,$d2);
            $exp_count = $diff->format("%R%a");
            if($exp_count >= +90)
            {
                $exp_status = 'Valid';
            }elseif($exp_count > +30 && $exp_count < +90)
            {
                $exp_status = 'Review and Advise';
            }elseif($exp_count <= +30)
            {
                $exp_status = 'Urgent Action Required';
            }
            $candidate->cer_expiry = $exp_date;
            $candidate->expiry_status = $exp_status;
            $array[$j] = $candidate; 
            $j++;
        }
        if($candidate->fitness_upload1 != '')
        {
            $candidate->sno = $i++;
            $candidate->name = $candidate->first_name.' '.$candidate->last_name;
            $candidate->doc_type = 'Fitness to Work';
            $cur_date = date('d-m-Y');
            $exp_date = date('d-m-Y',strtotime($candidate->fitness_issue_date));
            $d1 = date_create($cur_date);
            $d2 = date_create($exp_date);
            $diff = date_diff($d1,$d2);
            $exp_count = $diff->format("%R%a");
            if($exp_count >= +90)
            {
                $exp_status = 'Valid';
            }elseif($exp_count > +30 && $exp_count < +90)
            {
                $exp_status = 'Review and Advise';
            }elseif($exp_count <= +30)
            {
                $exp_status = 'Urgent Action Required';
            }
            $candidate->cer_expiry = $exp_date;
            $candidate->expiry_status = $exp_status;
            $array[$j] = $candidate;
            $j++;
        }
    }

    $this->candidates = $candidates;
    return $candidates;
}
 public function map($report): array
{
    return [
        $report->sno,
        $report->name,
        $report->doc_type,
        $report->cer_expiry,
        $report->expiry_status
    ];
}

public function headings(): array
{
    return [ 
        'S.No',
        'Candidate Name',
        'Document Type',
        'Expiry Date',
        'Status'
    ];
}