PHP - Define file include in class for all methods to use - php

Question

Is there a way on including a file at the beginning of a class for all methods to use. The example below is a simplified version of what I am trying to achieve. Currently I have to include the file within every method.
Example Logic (not working)
class Myclass
{
protected require_once 'folerd1/folder2/pear/HTTP/Request2.php'; // this does not work
public function aMethod()
{
$request = new HTTP_Request2('http://example1.com/', HTTP_Request2::METHOD_GET);
try {
$response = $request->send();
if (200 == $response->getStatus()) {
echo $response->getBody();
} else {
echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
$response->getReasonPhrase();
}
} catch (HTTP_Request2_Exception $e) {
echo 'Error: ' . $e->getMessage();
}
}
public function aMethod1()
{
$request = new HTTP_Request2('http://example2.com/', HTTP_Request2::METHOD_GET);
try {
$response = $request->send();
if (200 == $response->getStatus()) {
echo $response->getBody();
} else {
echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
$response->getReasonPhrase();
}
} catch (HTTP_Request2_Exception $e) {
echo 'Error: ' . $e->getMessage();
}
}
// more methods
}

Answer 1

2 solution
1) require_once taken outside from class
require_once 'folerd1/folder2/pear/HTTP/Request2.php';
class Myclass
{
2) Include in the construct
public function __construct() {
require_once 'folerd1/folder2/pear/HTTP/Request2.php';
}
But it is better first option

Answer 2

The best way is to look at autoloading standard http://www.php-fig.org/psr/psr-0/
Have you tried this? I don't know what's your Request2.php file content. So my code is only a PoC!
require 'folerd1/folder2/pear/HTTP/Request2.php';
class Myclass
{
public function aMethod()
{
$request = new Request2('http://example1.com/', Request2::METHOD_GET);
try {
$response = $request->send();
if (200 == $response->getStatus()) {
echo $response->getBody();
} else {
echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
$response->getReasonPhrase();
}
} catch (Request2_Exception $e) {
echo 'Error: ' . $e->getMessage();
}
}
public function aMethod1()
{
$request = new Request2('http://example2.com/', Request2::METHOD_GET);
try {
$response = $request->send();
if (200 == $response->getStatus()) {
echo $response->getBody();
} else {
echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
$response->getReasonPhrase();
}
} catch (Request2_Exception $e) {
echo 'Error: ' . $e->getMessage();
}
}
}

Answer 3

As I commented out, just require the file in the constructor of the PHP class:
class Myclass{
function Myclass(){
require_once('folerd1/folder2/pear/HTTP/Request2.php');
}
I have not checked this, but it MIGHT be possible that what you're just doing is including it not only for all the class to see, but the entire script. Please, check that out if it is a problem for you. If not, the other 2 solutions might end up doing the same.
Cheers