(PHP 4, PHP 5, PHP 7, PHP 8)
copy — Copies file
   Makes a copy of the file from to
   to.
  
If you wish to move a file, use the rename() function.
fromPath to the source file.
to
       The destination path. If to is a URL, the
       copy operation may fail if the wrapper does not support overwriting of
       existing files.
      
If the destination file already exists, it will be overwritten.
contextA valid context resource created with stream_context_create().
Example #1 copy() example
<?php
$file = 'example.txt';
$newfile = 'example.txt.bak';
if (!copy($file, $newfile)) {
    echo "failed to copy $file...\n";
}
?>