Can open PSE API using browser but not using PHP - php

Question

I'm trying to record data from Philippine Stock Exchange website. I have found that they have an endpoint which is http://www.pse.com.ph/stockMarket/companyInfo.html?method=fetchHeaderData&company=29&security=146
I can clearly access it using any browsers except when I go into incognito mode where I'm being shown with a content saying Access Denied and it never stops loading. When I try to access it using PHP I'm quite sure that what is happening is the same as the later.
I'm trying to access it using PHP to no avail, here are the attempts I tried:
file_get_contents
cURL with user agent
cURL with temporary cookies
Tried all in localhost and in live server.
Code:
$c = tempnam ("/tmp", "CURLCOOKIE");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.pse.com.ph/stockMarket/companyInfo.html");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_COOKIESESSION, true );
curl_setopt($ch, CURLOPT_COOKIEJAR, $c);
curl_setopt($ch, CURLOPT_COOKIEFILE, $c);
curl_setopt($ch, CURLOPT_POSTFIELDS, "method=fetchHeaderData&ajax=true&company=29&security=146");
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
var_dump(curl_exec($ch));
curl_close ($ch);
I don't have any clear idea on why and how does this happen. Can someone explain to me why it happens and what are the possible solutions (PHP only if possible)
I have reviewed other developer's approach on this API (They all implemented it using Java) and it is just a simple POST request and it is done. I have not verified though if their code is still working. I can't post links to their repository (limited).
SOLUTIONS:
Problem 1. Can't access API
$posts = array(
"method"=>"fetchHeaderData",
"ajax"=>"true",
"company"=>29,
"security"=>146
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.pse.com.ph/stockMarket/companyInfo.html");
curl_setopt($ch, CURLOPT_POSTFIELDS,$posts);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
var_dump(curl_exec($ch));
curl_close ($ch);
It seems I have two different problems. I can now access and use the API using the code above. No need for other options. Turning the post data into array fixed the problem.
Problem 2. Access Denied
On the problem about the Access Denied, it is cookie related. Answered below by #Wayne.
Unfortunately, I can't accept two answers.

Answer 1

Try this solution. convert your post data in array then pass this array in CURLOPT_POSTFIELDS
$posts = array(
"method"=>"fetchHeaderData",
"ajax"=>"true",
"company"=>29,
"security"=>146
);
$c = tempnam ("/tmp", "CURLCOOKIE");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.pse.com.ph/stockMarket/companyInfo.html");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_COOKIESESSION, true );
curl_setopt($ch, CURLOPT_COOKIEJAR, $c);
curl_setopt($ch, CURLOPT_COOKIEFILE, $c);
curl_setopt($ch, CURLOPT_POSTFIELDS,$posts);
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
var_dump(curl_exec($ch));
curl_close ($ch);

Answer 2

It is because they have their server setup to stop you from doing that. They are securing the data with a cookie.
Cookie details
When you visit the site http://www.pse.com.ph/stockMarket/companyInfo.html it gives you a cookie as it knows you are a human visitor.
In your browser tools enter
document.cookie
to see your cookie. It will provide you an individual the data because you have the cookie.
Remove the cookie
document.cookie = "JSESSIONID=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
and visit
http://www.pse.com.ph/stockMarket/companyInfo.html?method=fetchHeaderData&company=29&security=146
without going to get a cookie http://www.pse.com.ph/stockMarket/companyInfo.html first you will get the 403 (Forbidden)
Also they do not have jsonp with a callback so an ajax request will violate the cross domain security. Requests for the JSON must be from pages that originate from their domain or an approved domain.
Why would they do that.
Likely their licence to the information does not allow them to give it to other websites, or they need/want to get paid to provide the information to other websites. Or they have terms of use for the information.
Where can you get the data ... data wants to be free
I don't see anyplace on their site http://www.pse.com.ph where they have API information and how to request permission to access it.
Programable web has been the number one source for finding APIs, they have 96 stock APIs listed ... Obviously I can not just copy their data and past it here, but one of these API may work for you?