常见用法：1、发送GET请求；2、发送POST请求；3、设置请求头；4、处理Cookie；5、下载文件。
Snoopy类是一个用于HTTP请求和抓取网页内容的PHP库。以下是Snoopy类的一些常见用法：
include_once('Snoopy.class.php');$snoopy = new Snoopy;$snoopy->fetch('http://example.com');$result = $snoopy->results;echo $result;include_once('Snoopy.class.php');$snoopy = new Snoopy;$snoopy->submit('http://example.com', array('username' => 'admin', 'password' => 'password'));$result = $snoopy->results;echo $result;include_once('Snoopy.class.php');$snoopy = new Snoopy;$snoopy->agent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3';$snoopy->referer = 'http://example.com';$snoopy->fetch('http://example.com');$result = $snoopy->results;echo $result;include_once('Snoopy.class.php');$snoopy = new Snoopy;$snoopy->cookies['PHPSESSID'] = '1234567890abcdef';$snoopy->fetch('http://example.com');$result = $snoopy->results;echo $result;include_once('Snoopy.class.php');$snoopy = new Snoopy;$snoopy->fetch('http://example.com/image.jpg');$snoopy->saveToFile('local/path/image.jpg');这些只是Snoopy类的一些基本用法示例，实际上它还有许多更高级和丰富的功能，如处理重定向、处理表单、处理AJAX请求等。您可以参考Snoopy类的文档了解更多用法和功能。
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