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Import excel data in database using PhpSpreadsheet PHP

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CREATE TABLE `users` (
  `id` int(11) NOT NULL,
  `name` varchar(100) NOT NULL,
  `email` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

index.php

<!DOCTYPE html>
<html>
<body>
<form method="post" action="import.php" enctype="multipart/form-data">
    <div class="form-group">
        <label for="exampleInputFile">File Upload</label>
        <input type="file" name="file" class="form-control" id="exampleInputFile">
    </div>
    <button type="submit" name="submit" class="btn btn-primary">Submit</button>
</form>
</body>
</html>

import.php

<?php
require_once 'vendor/autoload.php';
$conn = mysqli_connect("localhost","root","","mbsgn");
 
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Reader\Csv;
use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
 
if (isset($_POST['submit'])) {
 
    $file_mimes = array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel', 'text/plain', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
     
    if(isset($_FILES['file']['name']) && in_array($_FILES['file']['type'], $file_mimes)) {
     
        $arr_file = explode('.', $_FILES['file']['name']);
        $extension = end($arr_file);
     
        if('csv' == $extension) {
            $reader = new \PhpOffice\PhpSpreadsheet\Reader\Csv();
        } else {
            $reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
        }
 
        $spreadsheet = $reader->load($_FILES['file']['tmp_name']);
 
        $sheetData = $spreadsheet->getActiveSheet()->toArray();
         
        if (!empty($sheetData)) {
            for ($i=1; $i<count($sheetData); $i++) {
                $name = $sheetData[$i][0];
                $email = $sheetData[$i][1];
$sql = "INSERT INTO USERS(name, email) VALUES('$name', '$email')";

if (mysqli_query($conn, $sql)) {
 echo "New record created successfully";
} else {
 echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
            }
        }
    }
}
?>

process.php

<?php
include_once 'database.php';
if(isset($_POST['save']))
{	 
	 $first_name = $_POST['first_name'];
	 $last_name = $_POST['last_name'];
	 $city_name = $_POST['city_name'];
	 $email = $_POST['email'];
	 $sql = "INSERT INTO employee (first_name,last_name,city_name,email)
	 VALUES ('$first_name','$last_name','$city_name','$email')";
	 if (mysqli_query($conn, $sql)) {
		echo "New record created successfully !";
	 } else {
		echo "Error: " . $sql . "
" . mysqli_error($conn);
	 }
	 mysqli_close($conn);
}
?>
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