This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.
Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:
getTweetsFor("domenic", function (err, results) {
// the rest of your code goes here.
| {"results":[{"address":{"address":"\u041c\u043e\u0441\u043a\u0432\u0430, \u0410\u0441\u0442\u0440\u0430\u0434\u0430\u043c\u0441\u043a\u0430\u044f \u0443\u043b\u0438\u0446\u0430, 9\u043a2","lat":55.813081,"long":37.563305},"error":"chain_zone_changed"},{"address":{"address":"\u041c\u043e\u0441\u043a\u0432\u0430, \u041c\u043e\u0445\u043e\u0432\u0430\u044f \u0443\u043b\u0438\u0446\u0430, 13\u04411","lat":55.756439,"long":37.61325},"error":"chain_zone_changed"}]} |
| <?php | |
| /** | |
| * This class can add WSSecurity authentication support to SOAP clients | |
| * implemented with the PHP 5 SOAP extension. | |
| * | |
| * It extends the PHP 5 SOAP client support to add the necessary XML tags to | |
| * the SOAP client requests in order to authenticate on behalf of a given | |
| * user with a given password. | |
| * |