php linux 下等待输入

<?php
fwrite(STDOUT, "请输入消息 Please input msg1：");  
$msg1 = trim(fgets(STDIN));
echo $msg1.PHP_EOL;
fwrite(STDOUT, "请输入消息 Please input msg2：");  
$msg2 = trim(fgets(STDIN));
echo $msg2.PHP_EOL;