transaksi-banyak.php

<?php include "koneksi.php"; ?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
        <h2>Masukkan Jumlah Data</h2>
        <form action="#" method="post">
            <input type="text" name="jumlah" placeholder="Masukkan Jumlah Data Transaksi">
            <input type="submit" name="tambah" value="Tambah">
        </form>
        </p>
</body>
</html>

<?php if(isset($_POST['tambah'])) { ?>

<form action="" method="post">
<input type="text" name="kode_transaksi" placeholder="Masukkan Kode"><br>
    <?php

    $jumlah = $_POST['jumlah'];

    for($a = 1; $a <= $jumlah; $a++) {

    ?><br>

    <b>Data Ke <?php echo $a; ?></b><br>
    <input type="text" name="nama[]" >

    <?php } ?>

    <input type="submit" name="simpan" value="Simpan">
</form>

<?php } ?>

<?php

$nama = $_POST['nama'];
$kode = $_POST['kode_transaksi'];
$jumlah = count($nama);

for($x=0;$x<$jumlah;$x++) {
    $query = mysqli_query($koneksi, "INSERT INTO transaksi (kode_transaksi, nama) VALUES ('$kode', '$nama[$x]')");
}