include 'inc/db.php';

if (empty($_SESSION['kullanici_giris']) {
    header("location:login");
    exit;
}

session_start();
ob_start();
error_reporting(0);
date_default_timezone_set('Europe/Istanbul');

try 
{
	$db = new PDO("mysql:host=localhost;dbname=db_adi;charset=utf8",'db_kullanici','db_sifre');
	//echo "Veritabanı Bağlantısı Başarılı.";
} 
catch (PDOExpception $e) 
{
	echo $e->getMessage();
}

<form id="form" enctype="multipart/form-data">
							<div class="card">
								<div class="card-body">
									<div class="row mt-2" style="justify-content: center;">
										<div class="col-md-1">
											<label class="form-label mt-1">Site Logo</label>
										</div>
										<div class="col-md-1">
											<img src="../<?php echo $settingrow['setting_logo'] ?>" class="img-fluid mt-1 setting_uploaded_logo">
										</div>
										<div class="col-md-1">
											<input type="text" class="form-control" name="setting_logo_width" value="<?php echo $settingrow['setting_logo_width'] ?>">
										</div>
										<div class="col-md-3">
											<input type="file" class="form-control" name="setting_logo">
										</div>
									</div>
									 </div>
									 </div>
									 </form>

var file_data = $('#setting_logo').prop('files')[0];   
			var form_data = new FormData();
			form_data.append('file', file_data);

			$.ajax({
				url: "inc/inc-logo.php",
				dataType: 'script',
				cache: false,
				contentType: false,
				processData: false,
				data: form_data,            
				type: 'post',
				success: function(e) {
					if (e=="no2")
					{

					}
					else if (e!="no") {
						$(".setting_uploaded_logo").attr('src', '../'+e);
						toastr['success']('Logo Başarıyla Güncellendi!');
					}
					else if (e=="no")
					{
						toastr['error']('Logo Güncellenemedi!');
					}
				},
				error: function(e) {
					toastr['error']('Logo Güncellenemedi!');
				}
			});

if (isset($_POST))
{
	if ($_FILES['file']['size']>0)
	{
		$last_logo=$settingrow['setting_favicon'];
		unlink("../../$last_logo");

		$authorized=array('jpg','png','jpeg');
		$ext=strtolower(substr($_FILES['file']["name"],strpos($_FILES['file']["name"],'.')+1));

		if (in_array($ext, $authorized) === false) 
		{
			echo "no";
			exit;
		}

		$uploads_dir = '../../img';
		@$tmp_name = $_FILES['file']["tmp_name"];
		@$name = $_FILES['file']["name"];
		$rand=uniqid();
		$image_src=substr($uploads_dir, 6)."/".$rand.$name;
		@move_uploaded_file($tmp_name, "$uploads_dir/$rand$name");

		$updatephoto=$db->prepare("UPDATE setting set setting_favicon=:setting_favicon where setting_id=:setting_id");
		$check=$updatephoto->execute(array(
			'setting_favicon' => $image_src,
			'setting_id' => 1
		));

		if ($check)
		{
			echo $image_src;
			exit;
		}
		else
		{
			echo "no";
			exit;
		}
	}
	else
	{
		echo "no2";
		exit;
	}
}