Test code for http://stackoverflow.com/q/26316521/157957

gistfile1.php

<?php

$source = 'echo "Hello World!\\n";';
$gz = addslashes(gzdeflate($source,9));
$a = "<?php \$var='"; $b = "'; eval(gzinflate(stripslashes(\$var)));";

$result = $a.$gz.$b;

$fp = fopen('so-26316521-out.php', 'wb');
fwrite($fp, $result);
fclose($fp);