gsf/app/Imports/UserImport.php

<?php

namespace App\Imports;

use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Validator;

class UserImport implements ToCollection, WithHeadingRow
{
    public function collection(Collection $rows)
    {
        $errors = [];
        foreach ($rows as $key => $row) {
            
            $email = $row['email'];

            // Check if the email is not empty and is a valid email address
            if (!empty($email)) {   
                
                // Validation passed, create the user
                $excelDate = $row['start_date'];
                if($excelDate != null){
                    $unixTimestamp = ($excelDate - 25569) * 86400; // Convert Excel date to Unix timestamp
                    $start_date = date("Y-m-d", $unixTimestamp);
                }
                else{
                    $start_date = null;
                }
                    
                    
                $excelDate = $row['end_date'];
                if($excelDate != null){
                    
                    $unixTimestamp = ($excelDate - 25569) * 86400; // Convert Excel date to Unix timestamp
                    $end_date = date("Y-m-d", $unixTimestamp); 
                }
                else{
                    $end_date = null;
                }
                
                $existingUserData = User::where('email_id',$email)->first();
            
                if($existingUserData){
                    // dd($existingUserData->start_date);
                    // dd($row['start_date']);
                    if($end_date > $existingUserData->end_date)
                    {
                        
                        // dd($existingUserData);
                        $data = User::where('email_id', $row['email'])->update([
                            'utm_source' => $row['utm_source'],
                            'full_name' => $row['customer_name'],
                            'contact_number' => $row['phone_number'],
                            // 'password' => Hash::make($row['password']),
                            'address' => $row['country'],
                            'fitness_goal' => $row['fitness_goal'],
                            'hear_about' => $row['where_did_you_hear_about_the_program'],
                            'start_date' => $start_date,
                            'end_date' => $end_date,
                        ]);
                    }
                }else{
                    User::Create([
                        'email_id' => $row['email'],
                        'utm_source' => $row['utm_source'],
                        'full_name' => $row['customer_name'],
                        'contact_number' => $row['phone_number'],
                        'password' => Hash::make($row['password']),
                        'address' => $row['country'],
                        'fitness_goal' => $row['fitness_goal'],
                        'hear_about' => $row['where_did_you_hear_about_the_program'],
                        'start_date' => $start_date,
                        'end_date' => $end_date,
                        ]);
                }
                    
            }
                
        }
        
        return $errors; 
    }

    public function customValidationMessages($rowKey)
    {
        return [
            'email.unique' => 'Email should be unique at row ' . ($rowKey + 1),
        ];
    }

    public function rules(): array
    {
        return [
            'email' => 'required|unique:users,email_id',
        ];
    }
}