如何使用 unlink function 在 joomla 中更新和删除文件时删除文件？ 并使用取消链接获取要删除的已上传图像？

Question

I am able to upload file in joomla.
I want to know if the user is updating images with another image like then the file already present and linked with user id should be replaced or deleted.
In case of delete function should be removed.

$src = $file ['tmp_name'];

$dest = JPATH_COMPONENT . DS . "uploads" . DS . $newfilename;

JFile::upload ( $src, $dest );

// update the field greeting_pic //
$result = $model->updateGreetingPic ( $id, $newfilename );

I want to replace the uploaded image if present and replace it with the new one.
How do I fetch the already uploaded image from the database (MySQL).

Answer 1

How do I fetch the already uploaded image from the database (MySQL)?

$userid = mysql_real_escape_string($_GET['userid']);
$sql = "SELECT imagefilename FROM images WHERE userid = '$userid'";
$result= mysql_query($query) or die (mysql_error());
//note that it may be possible to have multiple images, depending on your app
//and database rules.   
while ($row = mysql_fetch_assoc($result)) { 
  //replace pic in $row['imagefilename']
}