PHP uses POP3 to read the mailbox and receive mail instance analysis

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<?php
$array_values[&#39;host&#39;] = "host";
$array_values[&#39;port&#39;] = 110;
$array_values[&#39;user&#39;] = &#39;用户名&#39;;
$array_values[&#39;password&#39;] = &#39;密码&#39;;
$array_values[&#39;checkmail&#39;] = &#39;xxx@xxx.xxx&#39;;

ganji_get_test_mail($array_values);

function ganji_get_test_mail($array_values)
{
  $host = $array_values[&#39;host&#39;];
  $port = $array_values[&#39;port&#39;];
  $user = $array_values[&#39;user&#39;];
  $password = $array_values[&#39;password&#39;];
  $checkmail = $array_values[&#39;checkmail&#39;];
  $msg = &#39;&#39;;
  $return_msg = &#39;&#39;;
  // ini_set(&#39;memory_limit&#39;, &#39;80M&#39;);
  if (! ($sock = fsockopen(gethostbyname($host), $port, $errno, $errstr))) {
    exit($errno . &#39;: &#39; . $errstr);
  }

  set_socket_blocking($sock, true);

  $command = "USER " . $user . "\r\n";
  fwrite($sock, $command);
  $msg = fgets($sock);
  $command = "PASS " . $password . "\r\n";
  fwrite($sock, $command);
  $msg = fgets($sock);

  $command = "stat\r\n";
  fwrite($sock, $command);
  $return_msg = fgets($sock);

  $msg = fgets($sock);

  $command = "LIST\r\n";
  fwrite($sock, $command);
  $all_mails = array();
  while (true) {
    $msg = fgets($sock);
    if (! preg_match(&#39;/^\+OK/&#39;, $msg) && ! preg_match(&#39;/^\./&#39;, $msg)) {
      $msg = preg_replace(&#39;/\ .*\r\n/&#39;, &#39;&#39;, $msg);
      array_push($all_mails, $msg);
    }
    if (preg_match(&#39;/^\./&#39;, $msg))
      break;
  }

  // 获取邮件列表
  $ganji_mails = array();
  foreach ($all_mails as $item) {
    fwrite($sock, "TOP $item 0\r\n");
    while (true) {
      $msg = fgets($sock);
      // echo $msg . "<Br><Br>";
      if (preg_match(&#39;/^\./&#39;, $msg)) {
        array_push($ganji_mails, $item);
        break;
      }
    }
    continue;
  }

  $mail_content = &#39;&#39;;
  $array_ganji_mails = array();

  //逐行遍历
  foreach ($ganji_mails as $item) {
    fwrite($sock, "RETR $item\r\n");
    while (true) {
      $msg = fgets($sock);
      $mail_content .= $msg;
      if (preg_match(&#39;/^\./&#39;, $msg)) {
        array_push($array_ganji_mails, iconv_mime_decode_headers($mail_content, 0, "UTF-8"));
        $mail_content = &#39;&#39;;
        break;
      }
    }
  }

  // 直接获取第一封邮件全部信息 9999长度
  fwrite($sock, "RETR 1\r\n");
  $mail_contents = fread($sock, 9999); // 直接获取全部

  echo "<br>";
  var_dump($mail_contents);
  echo "<br>";

  $command = "QUIT\r\n";
  fwrite($sock, $command);
  $msg = fgets($sock);

  return $mail_contents;
}

Introduction to commonly used POP3 commands:

Commands	Parameters	Status	Description
USER	username	Approval	This Command and the following pass command, if successful, will result in a state transition
PASS	password	Recognition
APOP	Name,Digest	Recognition	Digest is the MD5 message digest
STAT	None	Processing	Request the server to send back statistics about the mailbox, such as the total number of messages and the total number of bytes
UIDL	[Msg#]	Processing	Returns a unique identifier for the message, each identifier for the POP3 session will be unique
LIST	[Msg#]	Processing	Return the number of messages and the size of each message
RETR	[Msg#]	Processing	Return the full text of the message identified by the parameter
DELE	[Msg#]	Processing	The server marks the email identified by the parameter for deletion, which is executed by the quit command
RSET	None	Processing	The server will reset all messages marked for deletion, used to undo the DELE command
TOP	[Msg#]	Processing	The server will return the first n lines of the email identified by the parameter, n must be a positive integer
NOOP	None	Processing	The server returns a positive response and takes no action.
QUIT	None	Update	Quit

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