Extract data from HTML tag - php

Question

I have the following code and trying to extract the value of attribute content from an html page, But it's not giving any result that I expect, instead its give only blank page.
Any help where could be the issue ?
$url= "https://fr-ca.wordpress.org";
$html = file_get_contents($url);
# Create a DOM parser object
$dom = new DOMDocument();
$dom->loadHTML($html);
foreach ($dom->getElementsByTagName('meta') as $key ) {
echo "<pre>";
$tab[] = $key->getAttribute('content');
}
$reg= '<meta name="generator" content="(.*?)"/>';
if (preg_match_all($reg, $html, $ar)) {
print_r($ar);
}
Page source has :
<meta name="generator" content="WP 4.5"/>

Answer 1

try this:
$html = '<meta name="generator" content="WP 4.5"/>';
preg_match_all('/content="(.*)"/i', $html, $matches);
if (isset($matches[1])) {
print_r($matches[1]);
}

Answer 2

Here is a regex that will look for a meta tag and get the content attribute contents. It has some wild cards that will account for other variables such as different names, or extra spaces, etc.
$html = '<meta name="generator" content="WP 4.5"/>';
preg_match_all( '#<meta.*?content=[\'"](.*?)[\'"]\s*/>#i', $tab, $results );
print_r( $results[1] ); // contains array of captures.
if( $results[1] ) {
// code here...
}

Answer 3

please use like this ...
$html = file_get_contents( $url);
libxml_use_internal_errors( true);
$doc = new DOMDocument;
$doc->loadHTML( $html);
$xpath = new DOMXpath( $doc);
// A name attribute on a <div>???
$nodes = $xpath->query( '//div[#name="changeable_text"]')->item( 0);
echo $nodes->Content;
OR
// Use Curl ...
function getHTML($url,$timeout)
{
$ch = curl_init($url); // initialize curl with given url
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]); // set useragent
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // write the response to a variable
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // follow redirects if any
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); // max. seconds to execute
curl_setopt($ch, CURLOPT_FAILONERROR, 1); // stop when it encounters an error
return #curl_exec($ch);
}
$html=getHTML("http://www.website.com",10);
// Find all images on webpage
foreach($html->find("img") as $element)
echo $element->src . '<br>';
// Find all links on webpage
foreach($html->find("a") as $element)
echo $element->href . '<br>';