PHP Extracting a part of the string if found - php

Question

I am scraping a website and finding a string, then when that string is found, i will be extracting a part of that string.
I am looking for a string "twitter:image" in a website, then when found, i will be extracting the "content" value of that. So here's an example of the website that i'm scraping. This is the HTML or "View Source" of that website:
Here is an example of my code:
I am using a library called "ProxyCrawl"
$ch = new ProxyCrawl();
$response = $ch->get($link, false);
if ($response->original_status == 200) {
$result = $response->body;
if (strpos($result, 'name="twitter:image"') !== false) {
Log::debug("found!");
//then extract the content
} else {
//do nothing
}
}
I already have the code on checking whether the "twitter:image" exist, but i don't have the code when extracting the "content" value.
Any help is greatly appreciated. Thanks!

Answer 1

If <meta name="twitter:image" /> is a unique element on page then use this:
$ch = new ProxyCrawl();
$response = $ch->get($link, false);
if ($response->original_status == 200) {
$dom = new DOMDocument;
$dom->loadHTML($response->body);
$xpath = new DOMXpath($dom);
$element = $xpath->query("//meta[#name='twitter:image']/#content");
if (!empty($element->item(0))) {
$imageUrl = $element->item(0)->nodeValue;
}
}
Otherwise, if there are multiple elements of this kind, you will need to iterate:
$ch = new ProxyCrawl();
$response = $ch->get($link, false);
if ($response->original_status == 200) {
$dom = new DOMDocument;
$dom->loadHTML($response->body);
$xpath = new DOMXpath($dom);
$imageUrls = [];
$elements = $xpath->query("//meta[#name='twitter:image']");
if ($elements !== false) {
foreach ($elements as $element) {
$imageUrls[] = $element->getAttribute('content');
}
}
}

Answer 2

This is a really quick example but a regex would be the way to go:
/(name=\"twitter:image\")(.)content=\"(.+)\"/im
This would match a string that contains name="twitter:image" followed by content=". You can get the text of content from the third grouping:
$str = '<meta data-rl="true" name="twitter:image" content="testing"';
$regex = '/(name="twitter:image")(.)content="(.+)"/im';
preg_match_all($regex, $str, $results);
print_r($results);
This is a rough example, you'll have to use this as a basis for your exact implementation. There are cleaner solutions to this (and probably better regexes) but this will get you going.

Answer 3

I don't know laravel (I use Symfony) and I am new to StackOverflow, but something like this could work:
if(strstr($result, 'name="twitter:image"')) {
$namestart = strpos($result, 'name="twitter:image"');
$substr1 = substr($result, $namestart);
$contentstart = strpos($result, 'content="') + 8;
$substr2 = substr($result, $contentstart);
$contentend = strpos($substr, '"');
$content = substr($result, $contentstart, $contentend)
}
Not tested!