php命令行程序中让用户进行输入

<?php
if(!defined("STDIN")) {
define("STDIN", fopen('php://stdin','r'));
}
//php5.2里面STDIN已经定义了
echo "Hello! What is your name (enter below):\n";
$strName = fread(STDIN, 80);
echo 'Hello ',$strName, "\n";