When running reproduce.php both eval'd pieces of code output "first", but the second one should be outputting "second"

first.php

return function ($in, $debugopt = 1) {
    return (function() {return 'first';})();
};

reproduce.php

<?php

function processTemplate( $templateName ) {
        $code = file_get_contents( __DIR__ . "/$templateName.php" );
        echo $code, "\n\n";
        $template = eval( $code );
        return $template( array() );
}

echo processTemplate( 'first' );
echo "\n-----\n\n";
echo processTemplate( 'second' );

second.php

return function ($in, $debugopt = 1) {
    return (function() {return 'second';})();
};