用php实现交互式工具——How do I write a command-line interactive PHP script?

I want to write a PHP script that I can use from the command line. I want it to prompt and accept input for a few items, and then spit out some results. I want to do this in PHP, because all my classes and libraries are in PHP, and I just want to make a simple command line interface to a few things.

The prompting and accepting repeated command line inputs is the part that's tripping me up. How do I do this?

参考：https://stackoverflow.com/questions/2929629/how-do-i-write-a-command-line-interactive-php-script

1. readline实现

<?php
do {
  $cmd = trim(strtolower( readline("\n> Command: ") ));
  readline_add_history($cmd);
  switch ($cmd) {
    case 'hello': print "\n -- HELLO!\n"; break;
    case 'bye': break;
    default: print "\n -- You say '$cmd'... say 'bye' or 'hello'.\n";
  }
} while ($cmd!='bye');

另外一种实现方式：

2. fgets实现

 #!/usr/bin/php
 <?php
 define('CONFIRMED_NO', 1);

 while (1) {
     fputs(STDOUT, "\n"."***WARNING***: This action causes permanent data deletion.\nAre you sure you're not going to wine about it later? [y,n]: ");

     $response = strtolower(trim(fgets(STDIN)));
     if( $response == 'y' ) {
         break;
     } elseif( $response == 'n' ) {
         echo "\n",'So I guess you changed your mind eh?', "\n";
         exit (CONFIRMED_NO);
     } elseif( $response == 'hello' ){
         echo "\n", "hello, world;\n";
     }
      else {
         echo "\n", "Dude, that's not an option you idiot. Let's try this again.", "\n";
         continue;
     }
 }

 echo "\n","You're very brave. Let's continue with what we wanted to do.", "\n\n";

　　test

3. fopen php://stdin实现

print "Type your message. Type '.' on a line by itself when you're done.\n";

$fp = fopen('php://stdin', 'r');
$last_line = false;
$message = '';
while (!$last_line) {
    $next_line = fgets($fp, 1024); // read the special file to get the user input from keyboard
    if (".\n" == $next_line) {
      $last_line = true;
    } else {
      $message .= $next_line;
    }
}