validasi upload ukuran gambar

<pre>&lt;?php require 'function.php';

if(isset($_POST["submit"])){

$kode_barang=$_POST["kode_barang"];
$nama_barang=$_POST["nama_barang"];
$merk_barang=$_POST["merk_barang"];
$harga_barang=$_POST["harga_barang"];

$namafile	 = $_FILES["foto_produk"]["name"];
$ukuranfile  = $_FILES["foto_produk"]["size"];
$error 	  	 = $_FILES["foto_produk"]["error"];
$tmpname 	 = $_FILES["foto_produk"]["tmp_name"];

// $foto_produk=$_POST["foto_produk"];

// cek apakah ada gambar yang di upload

if($error === 4){
	echo "<script>
	alert('Pilih gambar terlebih dahulu')
	</script>";

	echo "<script>
	alert('Data Gagal Disimpan');
	document.location.href='index.php';

	</script>";
	die();

	
	
}

	//cek apakah yang diupload adalah gambar

$ekstensigambarvalid=['jpg','jpeg','png'];
$ekstensigambar = explode('.', $namafile);
$ekstensigambar = strtolower(end($ekstensigambar));

if(!in_array($ekstensigambar, $ekstensigambarvalid)){
	echo "<script>

		alert('yang anda upload bukan gambar');


	</script>";
	echo "<script>
	alert('Data Gagal Disimpan');
	document.location.href='index.php';

	</script>";
	die();
}


// if($ukuranfile > "1000000"){
// 	echo "<script>
// 	alert('ukuran gambar terlalu besar');

// 	</script>";
// 	die();


if($ukuranfile > 1000000 )
	{
		echo "<script>
		alert('ukuran terlalu besar');
		</script>";
		die();
	}	





//cek jika ukuran terlalu besar
// if($ukuranfile > 100000){
// 	echo "<script>

// 	alert('ukuran gambar terlalu besar');


// 	</script>";

// 	echo "<script>
// 	alert('Data Gagal Disimpan');
//  document.location.href='index.php';

// 	</script>";
// }








	move_uploaded_file($tmpname,'img/'.$namafile);

		$q="INSERT INTO tbpenjualan VALUES('','$kode_barang','$nama_barang','$merk_barang','$harga_barang','$namafile') ";
	mysqli_query($conn,$q);

	if(mysqli_affected_rows($conn) > 0){

		echo "<script>
		alert('data berhasil disimpan');
		document.location.href='index.php';

		</script>";
	}else{
		echo "<script>

		alert('Data gagal disimpan');
		document.location.hef = 'index.php';

		</script>";
	}

			

}

?&gt;

&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt;

<form action="" method="post" enctype="multipart/form-data">
	


<ul>
	<li><label>Kode Barang :</label>
	<input type="text" name="kode_barang"></li>

	<li><label>Nama Barang :</label>
	<input type="text" name="nama_barang"></li>

	<li><label>Merk Barang :</label>
	<input type="text" name="merk_barang"></li>

	<li><label>Harga Barang :</label>
	<input type="text" name="harga_barang"></li>

	<li><label>Foto Produk :</label>
	<input type="file" name="foto_produk"></li>

	<li><button type="submit" name="submit">Simpan !</button></li>
</ul>

&lt;/form&gt; &lt;/body&gt; &lt;/html&gt;</pre>