php上传图片的实现代码

分享一例php上传图片的代码：

$uptypes = array (
    'image/jpg',
    'image/jpeg',
    'image/png',
    'image/pjpeg',
    'image/gif',
    'image/bmp',
    'image/x-png'
);
$max_file_size = 2000000; //上传文件大小限制, 单位BYTE
$destination_folder = "image/"; //上传文件路径
$imgpreview = 1; //是否生成预览图(1为生成,其他为不生成);
$imgpreviewsize = 1 / 2; //缩略图比例

if ($_SERVER['REQUEST_METHOD'] == 'POST') //判断是否提交且是要以POST方式提交
    {
    echo "";
    if (!is_uploaded_file($_FILES["upfile"][tmp_name]))
        //是否存在文件
        {
        echo " alert('图片不存在!');";
        echo " window.location='SplashAdd.php';";
        exit;
    }
    $file = $_FILES["upfile"];
    if ($max_file_size < $file["size"])
        //检查文件大小
        {
        echo "&nbsp;alert('文件太大!');";
        echo "&nbsp;window.location='SplashAdd.php';";
        exit;
    }
    if (!in_array($file["type"], $uptypes))
        //检查文件类型
        {
        $message = "文件类型不符!".$file["type"];
        echo "&nbsp;alert('$message');";
        echo "&nbsp;window.location='SplashAdd.php';";
        exit;
    }  //
    if (!file_exists($destination_folder)) {
        mkdir($destination_folder);
    }
    $filename = $file["tmp_name"];
    $image_size = getimagesize($filename);
    $pinfo = pathinfo($file["name"]);
    $ftype = $pinfo['extension'];
    $destination = $destination_folder . time() . "." . $ftype;
    if (file_exists($destination) && $overwrite != true) {
        echo "&nbsp;alert('同名文件已经存在了');";
        echo "&nbsp;window.location='SplashAdd.php';";
        exit;
    }
    if (!move_uploaded_file($filename, $destination)) {
        echo "&nbsp;alert('移动文件出错');";
        echo "&nbsp;window.location='SplashAdd.php';";
        exit;
    }
    $pinfo = pathinfo($destination);
    $fname = $pinfo[basename];
}
?>