How can I get the span tag value using php curl and simple html dom parser?the exact value does not show

You can use xpath selector

<?php

$html = '<span class="file-count-label" ng-init="totalResultCount=304575" ng-show="totalResultCount" style="">304,575</span>';
$doc = new DOMDocument;
$doc->loadHTML($html);
$finder = new DomXPath($doc);
$classname="file-count-label";
$videos = $finder->query("//*[contains(@class, '$classname')]");

foreach($videos as $e)
{
  echo $e->nodeValue;
}

Output:- https://eval.in/1056186

Reference taken:- https://stackoverflow.com/a/6366390/4248328

It works for me:

include 'simple_html_dom.php';
$html = str_get_html('<span class="file-count-label" ng-init="totalResultCount=304575" ng-show="totalResultCount" style="">304,575</span>');

$videos=$html->find('span[class=file-count-label]');
foreach($videos as $e)
{
  echo $e->plaintext; 
  // 304,575
}