php中Snoopy类的用法有哪几种

Snoopy类是一个用于HTTP要求和抓取网页内容的PHP库。以下是Snoopy类的一些常见用法：
1. 发送GET要求：
```php
include_once('Snoopy.class.php');
$snoopy = new Snoopy;
$snoopy->fetch('http://example.com');
$result = $snoopy->results;
echo $result;
```
2. 发送POST要求：
```php
include_once('Snoopy.class.php');
$snoopy = new Snoopy;
$snoopy->submit('http://example.com', array('username' => 'admin', 'password' => 'password'));
$result = $snoopy->results;
echo $result;
```
3. 设置要求头：
```php
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;
```
4. 处理Cookie：
```php
include_once('Snoopy.class.php');
$snoopy = new Snoopy;
$snoopy->cookies['PHPSESSID'] = '1234567890abcdef';
$snoopy->fetch('http://example.com');
$result = $snoopy->results;
echo $result;
```
5. 下载文件：
```php
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要求等。您可以参考Snoopy类的文档了解更多用法和功能。