PHP code to obfuscate an HTML page on the browser to encode source code.

page-obfuscator.php

<?php
function randomString($length = 3) {
    $randomString = '';
    $characters = implode("", array_merge(range('a', 'z'), range('A', 'Z')));
    for ($i = 0; $i < $length; $i++) $randomString .= $characters[mt_rand(0, strlen($characters) - 1)];
    return $randomString;
}
function encode($output) { 
	  $randomFunc = randomString();
    $randomOut = randomString();
    $randomNum = randomString();
    $randomVal = mt_rand(999999, 99999999);
    $return = '<!-- Obfuscator HTML -->
    <script>var ' . $randomOut . ' = ""; var ' . $randomNum . ' = [';
    foreach(str_split($output) as $x){ $return .= '"'.base64_encode(randomString().(ord($x) + $randomVal).randomString()) . '", '; if (mt_rand(0, 1)){ $return .= "\n"; } }
    $return = rtrim($return, ', ');
    $return .= ']; ' . $randomNum . '.forEach(function ' . $randomFunc . '(value) { ' . $randomOut . ' += String.fromCharCode(parseInt(atob(value).replace(/\D/g,\'\')) - ' . $randomVal . '); } ); document.write(decodeURIComponent(escape(' . $randomOut . '))); </script>'  ;;
    return $return;
}
ob_start("encode");
?>