fitzify.php

<?php

function fitzify ($input) {
    return implode(\PHP_EOL, array_map(function($line) {
        return $line . (rand(1, 4) == 1 ? str_repeat("\t", rand(1, 4)) : '');
    }, explode(\PHP_EOL, $input)));
}

function fitzify_file($path) {
    if ( ! is_file($path)) {
        throw new InvalidArgumentException($path . 'doesn\'t appear to be a valid file');
    }
    if ( ! file_put_contents($path, fitzify(file_get_contents($path)))) {
        throw new RuntimeException('Could not fitzify ' . $path . ', check file permissions');
    }
}

$a = file_get_contents(__FILE__);
echo fitzify($a);