encode.php

<?php
/**
 * Copyright (c) 2020 Ramdhan Firmansyah
 * File              : encode.php
 * @author           : Cvar1984 <gedzsarjuncomuniti@gmail.com>
 * Date              : 28.04.2020
 * Last Modified Date: 28.04.2020
 * Last Modified By  : Cvar1984 <gedzsarjuncomuniti@gmail.com>
 */

while (!file_exists($fileName)) {
    $fileName = readline('File Name : ');
    $fileName = trim($fileName);
}

$outputName = readline('Output Name : ');
$outputName = trim($outputName);
$fileContents = file_get_contents($fileName);
$fileContents = base64_encode(gzdeflate($fileContents));
$fileContents = '<?php eval(\'?>\' . gzinflate(base64_decode(\'' . $fileContents . '\')));';

if (file_put_contents($outputName, $fileContents)) {
    echo 'Original Size : ' . filesize($fileName) . ' Bytes' . PHP_EOL;
    echo 'Encoded Size  : ' . filesize($outputName) . ' Bytes' . PHP_EOL;
} else {
    echo 'Can\'t write output permission denied' . PHP_EOL;
}