merge files

To merge known files ... this script will merge them into one, just place the file names into the $files array.  It does not randomize the contents however ... is that important?

<?php
error_reporting(E_ALL);
echo '<pre>';

// old files to be merged
$files   = array('/Apps/DATA/old_file_1.txt', '/Apps/DATA/old_file_2.txt');

// new file name
$newfile = '/Apps/DATA/new_file.txt';
// delete file if already exists
unlink($newfile);

foreach ( $files as $f ) {
    // Open the file to get existing content
    $data = file_get_contents($f);
    
    // Append the contents back to the new file
    file_put_contents($newfile, $data, FILE_APPEND);    
}
echo "done";
?>

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I need output data randomized.

My code randomizes the output - it shuffles (randomizes) the lines before writing them to the output file!

Works great. Thanks