掌握PHP和正则表达式的秘密武器：数据采集进化史

<?php
$html = file_get_contents("http://example.com");
preg_match('/<title>(.*?)</title>/', $html, $matches);
echo "网页标题为：" . $matches[1];
?>

<?php
$username = "your_username";
$password = "your_password";

$login_data = array(
    'username' => $username,
    'password' => $password
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://example.com/login");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');

$result = curl_exec($ch);

curl_setopt($ch, CURLOPT_URL, "http://example.com/data");
$result = curl_exec($ch);

preg_match('/<div class="data">(.*?)</div>/', $result, $matches);
echo "采集到的数据为：" . $matches[1];

curl_close($ch);
?>

<?php
require 'vendor/autoload.php';

use GoutteClient;

$client = new Client();

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

$title = $crawler->filter('title')->text();

echo "网页标题为：" . $title;
?>