file_get_contents get Cookies - php

Question

I'm trying to develop a full PHP web browser that can handle cookies. I've created the following class:
<?php
class Browser
{
private $cookies = '';
private $response_cookies = '';
private $content = '';
/**
* Cookie manager
* #Description : To set or get cookies as Array or String
*/
public function set_cookies_json($cookies)
{
$cookies_json = json_decode($cookies, true);
$cookies_array = array();
foreach ($cookies_json as $key => $value)
{
$cookies_array[] = $key .'='.$value;
}
$this->cookies = 'Cookie: ' . $cookies_array.join('; ') . "\r\n";
}
public function set_cookies_string($cookies)
{
$this->cookies = 'Cookie: ' . $cookies . "\r\n";
}
private function get_cookies()
{
global $http_response_header;
$cookies_array = array();
foreach($http_response_header as $s)
{
if (preg_match('|^Set-Cookie:\s*([^=]+)=([^;]+);(.+)$|', $s, $parts))
{
$cookies_array[] = $parts[1] . '=' . $parts[2];
}
}
$this->cookies = 'Cookie: ' . $cookies_array.join('; ') . "\r\n";
}
/**
* GET and POST request
* Send a GET or a POST request to a remote URL
*/
public function get($url)
{
$opts = array(
'http' => array(
'method' => 'GET',
'header' => "Accept-language: en\r\n" .
$this->cookies
)
);
$context = stream_context_create($opts);
$this->content = file_get_contents($url, false, $context);
$this->get_cookies();
return $this->content;
}
public function post($url, $post_data)
{
$post_content = array();
foreach ($post_data as $key => $value)
{
$post_content[] = $key .'='.$value;
}
$opts = array(
'http' => array(
'method' => 'GET',
'header' => "Content-type: application/x-www-form-urlencoded\r\n" .
$this->cookies,
'content' => $post_content.join('&'),
)
);
$context = stream_context_create($opts);
$this->content = file_get_contents($url, false, $context);
$this->get_cookies();
return $this->content;
}
}
Basically, it can send a GET request and 'should' retrieve the cookies.
I've made a very simple test script:
<?php
require('browser.class.php');
$browser = new Browser();
$browser->get('http://google.com');
print_r($browser->response_cookies);
But it fails on line 32 as $http_response_header looks to be null. Isn't it supposed to contain the header of my response ? I've read that page but it looks to work well for this guy : get cookie with file_get_contents in PHP
I know I could use cUrl to handle this but I'd really like to use a rough PHP code.
Did I make something wrong ?
Thanks for your precious help.
Edit:
Solution is:
<?php
class Browser
{
public $request_cookies = '';
public $response_cookies = '';
public $content = '';
/**
* Cookie manager
* #Description : To set or get cookies as Array or String
*/
public function set_cookies_json($cookies)
{
$cookies_json = json_decode($cookies, true);
$cookies_array = array();
foreach ($cookies_json as $key => $value)
{
$cookies_array[] = $key .'='.$value;
}
$this->request_cookies = 'Cookie: ' . join('; ', $cookies_array) . "\r\n";
}
public function set_cookies_string($cookies)
{
$this->request_cookies = 'Cookie: ' . $cookies . "\r\n";
}
private function get_cookies($http_response_header)
{
$cookies_array = array();
foreach($http_response_header as $s)
{
if (preg_match('|^Set-Cookie:\s*([^=]+)=([^;]+);(.+)$|', $s, $parts))
{
$cookies_array[] = $parts[1] . '=' . $parts[2];
}
}
$this->response_cookies = 'Cookie: ' . join('; ', $cookies_array) . "\r\n";
}
/**
* GET and POST request
* Send a GET or a POST request to a remote URL
*/
public function get($url)
{
$opts = array(
'http' => array(
'method' => 'GET',
'header' => "Accept-language: en\r\n" .
$this->request_cookies
)
);
$context = stream_context_create($opts);
$this->content = file_get_contents($url, false, $context);
$this->get_cookies($http_response_header);
return $this->content;
}
public function post($url, $post_data)
{
$post_content = array();
foreach ($post_data as $key => $value)
{
$post_content[] = $key .'='.$value;
}
$opts = array(
'http' => array(
'method' => 'GET',
'header' => "Content-type: application/x-www-form-urlencoded\r\n" .
$this->request_cookies,
'content' => join('&', $post_content),
)
);
$context = stream_context_create($opts);
$this->content = file_get_contents($url, false, $context);
$this->get_cookies($http_response_header);
return $this->content;
}
}

Answer 1

According to php.net:
$http_response_header will be created in the local scope.
Because of this $http_response_header is available only in the scope of get().
You can pass it like $this->get_cookies($http_response_header); or create a property to store it.