composerでPHP 5.3用のgoutte（ウェブスクレーパー）をインストールする。

composer.json

{
  "require": {
    "php": ">=5.3.3",
    "fabpot/goutte": "~1.0"
  }
}

composer.sh

curl -sS https://getcomposer.org/installer | php
php composer.phar install

test.php

<?php
require_once __DIR__ . '/vendor/autoload.php';
ini_set('default_charset', 'UTF-8');

define(USER_AGENT, 'Goutte/1.0.7');

$client = new Goutte\Client;
$client->setHeader('User-Agent', USER_AGENT);

$crawler = $client->request('GET', 'http://example.com/');

$crawler->filter('h1')->each(function($node) {
  echo $node->text()."\n";
});

exit(0);