function get($url){
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Mobile Safari/537.36");
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($curl, CURLOPT_MAXREDIRS, 10);
    curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 10);
    curl_setopt($curl, CURLOPT_REFERER, "https://www.google.com/");
    $curlResult = curl_exec($curl);
    curl_close($curl);
    return $curlResult;    
}

$json = get('https://www.instagram.com/explore/tags/fest/?__a=1');

print_r(json_decode($json, true));