這句話啥意思 stream_context_set_option($ctx, 'ssl' 'local_cert' 'ck.pem');該怎麼處理

這句話啥意思 stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem');
小弟是做用戶端的，PHP啥也不懂。
stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem'); 這句話是神馬意思，希望大神解釋。
還有同樣的功能能用Myeclipse實現嗎？謝謝！

完整的如下。

// Put your device token here (without spaces):
$deviceToken = '0f744707bebcf74f9b7c25d48e3358945f6aa01da5ddb387462c7eaf61bbad78';

// Put your private key's passphrase here:
$passphrase = 'pushchat';

// Put your alert message here:
$message = 'My first push notification!';

////////////////////////////////////////////////////////////////////////////////

$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem');
stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase);

// Open a connection to the APNS server
$fp = stream_socket_client(
'ssl://gateway.sandbox.push.apple.com:2195', $err,
$errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);

if (!$fp)
exit("Failed to connect: $err $errstr" . PHP_EOL);

echo 'Connected to APNS' . PHP_EOL;

// Create the payload body
$body['aps'] = array(
'alert' => $message,
'sound' => 'default'
);

// Encode the payload as JSON
$payload = json_encode($body);

// Build the binary notification
$msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;

// Send it to the server
$result = fwrite($fp, $msg, strlen($msg));

if (!$result)
echo 'Message not delivered' . PHP_EOL;
else
echo 'Message successfully delivered' . PHP_EOL;

// Close the connection to the server
fclose($fp);

------解決方案--------------------
stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem');

這句是說對於ctx這個socket串連，使用ssl協議，使用本地授權認證，使用ck.pem作為授權認證

eclipse是ide啊
php始終需要php環境執行的

