WeberDev.com -> PHP Manual -> Copies file

bool copy ( string $source , string $dest [, resource $context ] )

Makes a copy of the file source to dest .

If you wish to move a file, use the rename() function.

source: Path to the source file.
dest: The destination path. If dest is a URL, the copy operation may fail if the wrapper does not support overwriting of existing files.

Warning
If the destination file already exists, it will be overwritten.
context: A valid context resource created with stream_context_create().

Returns TRUE on success or FALSE on failure.

Version	Description
5.3.0	Added context support.
4.3.0	Both `source` and `dest` may now be URLs if the "fopen wrappers" have been enabled. See fopen() for more details.

Example #1 copy() example

 <?php
$file = 'example.txt';
$newfile = 'example.txt.bak';

if (!copy($file, $newfile)) {
    echo "failed to copy $file...\n";
}
?>

copy