How to parse certain lines in php?

Question

PHP

I have this code:

function curlGetPage ($url, $referer = 'https://google.com/')
{
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36 ');
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 1);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_REFERER, $referer);
  curl_setopt($ch, CURLOPT_HEADER, 0);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  $response = curl_exec($ch);
  curl_close($ch);

  return $response;
}


$parserpage = curlGetPage('https://api.csgorun.pro/current-state?montaznayaPena=null');
$html = str_get_html($parserpage);
echo "$parserpage";

As a matter of fact, by clicking on the link, I get a lot of lines of different information, but from all this I need to separately output only crashes, for example: "crash":1.71 , but since I'm a beginner, I don't know how to do it. Please help