Why get data is empty when using curl and regex [duplicate] - php

Question

This question already has answers here:
How do you parse and process HTML/XML in PHP?
(31 answers)
Closed 8 years ago.
Please help me check this code. I think my regex wrote has a problem but I don't know how to fix it:
function get_data($url)
{
$ch = curl_init();
$timeout = 5;
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
$content = get_data('http://ibongda.vn/lich-thi-dau-bong-da.hs');
$regex = '/<div id="zone-schedule-group-by-season">(.*)<\/div>/';
preg_match($regex, $content, $matches);
$table = $matches[1];
print_r($table);

Answer 1

I would advise against using regular expression for this. You should use DOM for this task.
The problem with your regular expression is running into newline sequences, it will match until the < in </div>, continuously keep backtracking and fail. Backtracking is what regular expressions do during the course of matching when a match fails. You need to use the s (dotall) modifier which forces the dot to match newlines as well.
$regex = '~<div id="zone-schedule-group-by-season">(.*?)</div>~s';

Answer 2

I suggest don't use regex to parse these. You can use an HTML Parser, DOMDocument with xpath in particular.
function get_data($url)
{
$ch = curl_init();
$timeout = 5;
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
$content = get_data('http://ibongda.vn/lich-thi-dau-bong-da.hs');
$dom = new DOMDocument();
libxml_use_internal_errors(true); // handle errors yourself
$dom->loadHTML($content);
libxml_clear_errors();
$xpath = new DOMXpath($dom);
$table_rows = $xpath->query('//div[#id="zone-schedule-group-by-season"]/table/tbody/tr[#class!="bg-gd" and #class!="table-title"]'); // these are the rows of that table
foreach($table_rows as $rows) { // loop each tr
foreach($rows->childNodes as $td) { // loop each td
if(trim($td->nodeValue) != '') { // don't show empty td
echo trim($td->nodeValue) . '<br/>';
}
}
echo '<hr/>';
}