how to use curl and preg_match _all div content - php

Question

I try to practice CURL,but it doesn't go well
Pleasw tell me what's wrong
here is my code
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://xxxxxxx.com/");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_USERAGENT, "Google Bot");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$downloaded_page = curl_exec($ch);
curl_close($ch);
preg_match_all('/<div\s* class =\"abc\">(.*)<\/div>/', $downloaded_page, $title);
echo "<pre>";
print($title[1]);
echo "</pre>";
and the warning is Notice: Array to string conversion
the html I want to parse is like this
<div class="abc">
<ul> blablabla </ul>
<ul> blablabla </ul>
<ul> blablabla </ul>
</div>

Answer 1

preg_match_all returns an array of arrays.
If your code is:
preg_match_all('/<div\s+class="abc">(.*)<\/div>/', $downloaded_page, $title);
you actually want to do the following:
echo "<pre>";
foreach ($title[1] as $realtitle) {
echo $realtitle . "\n";
}
echo "</pre>";
Since it will search all div's that have class "abc". I also suggest you harden your regex to be more robust.
preg_match_all('/<div[^>]+class="abc"[^>]*>(.*)<\/div>/', $downloaded_page, $title);
This will match as well as
BTW: DomDocument is slow as hell, I found out that regexes sometimes (depending on the size of your document) can give 40x speed increase. Just keep it simple.
Best,
Nicolas

Answer 2

Don't parse HTML with regex.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.lipsum.com/');
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$html = curl_exec($ch);
curl_close($ch);
$dom = new DOMDocument;
#$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
# foreach ($xpath->query('//div') as $div) { // all div's in html
foreach ($xpath->query('//div[contains(#class, "abc")]') as $div) { // all div's that have "abc" classname
// $div->nodeValue contains fetched DIV content
}