First uploaded picture not overwrite when resubmit the user picture

1. Upload a user picture
2. delete the picture
3. resubmit another picture.

Error: The first picture was not replaced.

delete all caching mechanisms (Website/browser) and retry.

Ans:

We can't change the core module(user.module). So we can change in hook_user. May be this will get error when we upgrade the version.

Another way to change the user picture.

Use hook_user function, in switch case, rename the file path with timestamp and update user table as same file path

Example:

function hook_user($op, &$edit, &$account, $category = NULL) {
switch($op){
case 'after_update':
case 'after_update':
$old_filename = $account->picture;
$filename = basename($account->picture);
$fileArray = explode('.', $filename);
$finalFilename = $fileArray[0].'-'.time().'.'.$fileArray[1];
$pictureArray = explode('/', $account->picture);
$pictureArray[count($pictureArray)-1]=$finalFilename;
$picturePath = implode('/', $pictureArray);
$account->picture = $picturePath;
rename($old_filename, $picturePath);
db_query("UPDATE users SET picture='$picturePath' WHERE uid=%d", $account->uid);
break;
}
}

This will work.