Merge

the easiest and best way is to use the below code

<?php

$txt1 = file_get_contents('1.txt');
$txt1 .= "\n" . file_get_contents('2.txt');
$txt1 .= "\n" . file_get_contents('3.txt');

$fp = fopen('newText.txt', 'w');
if(!$fp)
    die('Could not create / open text file for writing.');
if(fwrite($fp, $txt1) === false)
    die('Could not write to text file.');

echo 'Text files have been merged.';

?>