<?php

# script
$a = <<<'EOD'
echo fgets(STDIN);
EOD;

# encode
$enc = base64_encode($a);

print '[ENCODED]' . PHP_EOL;
print $enc . PHP_EOL;

# decode
$dec = base64_decode($enc);
print '[DECODED]' . PHP_EOL;
print $dec . PHP_EOL;
 
# decode & execute
print '[EXECUTED]' . PHP_EOL;
eval($dec);