How to call "CURL" to call external URL - php

Question

How to use "CURL" to call external URL since the url_fopen is disabled for security reasons. I want to open a pdf file. For security reason url_fopen function is disabled. So anyone can help me?
function Header()
{
$this->SetY(20);
$this->Image("images/logo-s.jpg", 120,0,80,20, "JPG", "www.example.com");
$this->Ln(4);
}

Answer 1

There are lots of answers for connecting, downloading or saving something to a URL by CURL function, but even if the CURL be disabled in your server you can still use stream_context_create, check this question
To do it with CURL try
$url = 'http://www.example.com/images/logo-s.jpg';
$path = '/path/to/images/logo-s.jpg';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
curl_close($ch);
file_put_contents($path, $data); // to save it somewhere

Answer 2

First initialize a curl handler with:
$curl_handler = curl_init("http://www.linktomypdf.com/");
If you need to read it into a file:
$fp = fopen("mypdf.pdf", "w");
Now use curl_setopt() to set the option for curl_handler:
curl_setopt($curl_handler, CURLOPT_FILE, $fp);
First parameter is always curl_handler, second is which option you want to set , third is the value you want to set. So this call set CURLOPT_FILE to be $fp.
There are list of options you can find it here:
https://php.net/manual/en/function.curl-setopt.php
To make it easy to read the code:
$curl_handler = curl_init("http://www.linktomypdf.com/");
$fp = fopen("mypdf.pdf", "w");
curl_setopt($curl_handler, CURLOPT_FILE, $fp);
curl_exec($ch); //execute curl session
curl_close($ch); // close curl_handler
fclose($fp); // close file