如何在上传文件的同一路径中保存文件，PHP？

Question

Use PHP , my concept is: User upload image by submit form, then script overlay logo watermark. I want to save the modified image to the same location of original image (on user's computer). My code now is something like this:

<form name="form1" method="post" action="watermark.php" enctype="multipart/form-data">

Select file:
<input type="file" name="uploadfile"/>
<input type="submit" value="submit">

</form>

How to know the path of original file to save the modified image in the same location?

Answer 1

You can't save it directly on user's computer (using HTML) as that would be a violation of - everything. Instead, you can provide the file for download after modification. Provided, you are using GD for watermarking, the code is simple (but not perfect and should be considered just a lead):

// perform some ops with $img

Header('Content-Type: image/jpeg');
Header('Content-Disposition: attachment; filename=' . $filename);

imagejpeg($img);

imagedestroy($img);