PHP 標準輸出/輸入/STDIN /STOOUT

$fp = fopen("php://stdin", "r");
$fp2 = fopen("php://stdout", "w");

while (!feof($fp)) {
    $buffer = fgets($fp);
    fputs($fp2, "input:$buffer");
}
fclose($fp);
fclose($fp2);

echo "exit";
?>