PHP找不到Phpstream类（使用名称空间和PHP5.4.9-4ubuntu2.3）

我使用composer安装了Pear2HTTP库，不幸的是，在使用该库时出现了一个错误（根据原则，但这不重要）

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这些类是pear2库，因此我强烈希望不要更改它们。我有什么遗漏吗？为什么php找不到类Phpstream？有一个'Request'文件夹和'Request.php'文件这一事实会让事情变得困难吗？条令类加载器使用zend framework类加载器，但我不确定这会产生什么影响。

我解决了这个问题，需要在/etc/php5/cli/php.ini中添加“extension=http.so”。我已经为apache2这样做了，但没有为cli这样做（这在ubuntu上是不同的）。我也需要做sudopecl安装-f pecl_http-1.7.6来拥有旧的API。

h@dev0 ~/Repositories/pfo $ vendor/bin/doctrine-module migrations:migrate
# A few statements before the error I included a statement to get the include path: echo ini_get('include_path');
/home/h/Repositories/pfo/vendor/pear-pear2.php.net/PEAR2_Text_Markdown:/home/h/Repositories/pfo/vendor/pear-pear2.php.net/PEAR2_HTTP_Request:.:/usr/share/php:/usr/share/pear

# Afterwards I get this error:
PHP Fatal error:  Class 'pear2\HTTP\Request\Adapter\Phpstream' not found in /home/h/Repositories/pfo/vendor/pear-pear2.php.net/PEAR2_HTTP_Request/pear2/HTTP/Request.php on line 98

# And the Phpstream.php does exist, it begins like this:
namespace pear2\HTTP\Request\Adapter;
use pear2\HTTP\Request;
class PhpStream extends Request\Adapter { ... }

# and is located here:
h@dev0 ~/Repositories/pfo $ ls /home/h/Repositories/pfo/vendor/pear-pear2.php.net/PEAR2_HTTP_Request/pear2/HTTP/Request/Adapter/
Curl.php  Filesystem.php  Http.php  Phpsocket.php  Phpstream.php

# The Request.php class looks like this, notice that this file is in a folder together with the Request folder for the 'Request\Adapter\Phpstream' class:
namespace pear2\HTTP;

class Request  {
    ....
    public function __construct($url = null, $instance = null)  {
        echo ini_get('include_path');
        ...
        $this->adapter = new Request\Adapter\Phpstream;
        ...
    }
}