php 开启采集函数

<?php
$url = 'https://example.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3');
$output = curl_exec($ch);
if ($output === false) {
    echo 'Curl error: ' . curl_error($ch);
}
curl_close($ch);
echo $output;
?>

<?php
include('simple_html_dom.php');
$html = file_get_html('https://example.com');
$titles = $html->find('h2.title');
foreach ($titles as $title) {
    echo $title->plaintext . '<br>';
}
?>

<?php
function fetchUrl($url) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3');
    $output = curl_exec($ch);
    curl_close($ch);
    return $output;
}

$urls = ['https://example.com/page1', 'https://example.com/page2', 'https://example.com/page3'];
foreach ($urls as $url) {
    sleep(1); // 每秒请求一次
    echo fetchUrl($url);
}
?>