在php中更改图像名称

Question

hi i want to upload image on server and i have done it but the problem is when i upload image with the same name it give me error what i want to do to append something to end of image name so that every image has its own unique name.

$TARGET_PATH =$TARGET_PATH . basename( $_FILES['photo']['name']);
if (file_exists($TARGET_PATH))
{
    // here will be the appended term
}

Answer 1

You should do this:

$TARGET_PATH =$TARGET_PATH . basename( $_FILES['photo']['name']);
while (file_exists($TARGET_PATH))
{
    $TARGET_PATH =$TARGET_PATH . basename( $_FILES['photo']['name'],'.jpg') . uniqid() . '.jpg';
}

That way it will always produce a unique file name. note this will work for files with the extension jpg. should you want to use it for other files then i would recommend this:

  $TARGET_PATH =$TARGET_PATH . basename( $_FILES['photo']['name']);
$ext = pathinfo($_FILES['photo']['name'], PATHINFO_EXTENSION);

    while (file_exists($TARGET_PATH))
    {
        $TARGET_PATH =$TARGET_PATH . basename( $_FILES['photo']['name'],'.' .$ext) . uniqid() . '.'.$ext;
    }

supplying an extension to basename will remove the extension from the name. Adding uniqid() will add some unique entropy to the end of the filename. If that's to long for you, you could replace it with rand(0,10);

This method also has the advantage of only executing when it finds that the file does exist, otherwise it won't run at all.