php 获取title

<?php
$url = 'http://example.com';
$html = file_get_contents($url);
preg_match('/<title>(.*?)<\/title>/i', $html, $matches);
$title = $matches[1] ?? 'No title found';
echo $title;
?>

<?php
$url = 'http://example.com';
$html = file_get_contents($url);
$dom = new DOMDocument();
@$dom->loadHTML($html); // 使用@抑制警告
$title = $dom->getElementsByTagName('title')->item(0)->nodeValue;
echo $title;
?>

<?php
require 'simple_html_dom.php';
$url = 'http://example.com';
$html = file_get_html($url);
$title = $html->find('title', 0)->plaintext;
echo $title;
?>

$dom->preserveWhiteSpace = false;
$dom->encoding = 'UTF-8';

function getUrlContent($url) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    $content = curl_exec($ch);
    curl_close($ch);
    return $content;
}
$html = getUrlContent($url);