Fetch CSE Current Market Price API

<?php 


header('Content-Type: application/json');

$method = $_SERVER['REQUEST_METHOD'];

//GET Request
switch ($method) {
    case 'GET': // read data
    getOperation();
    break;
}


//GET Function
function getOperation(){

  error_reporting(E_ALL ^ E_WARNING); 

  $sUrl = 'https://www.cse.com.bd/market/current_price';
  $html = file_get_contents($sUrl);
  
  $dom = new DOMDocument();
  @$dom->loadHTML($html);
  $xpath = new DomXPath($dom);
  $a = [];
  
  $elements = $xpath->query('//*[@id="dataTable"]/tbody');
  foreach($elements as $e){
  
    $len = $e->childNodes->length;
  
    for($n=0;$n<=$len;$n++){
  
      $scrip = $xpath->query('tr', $e)[$n]->childNodes[2]->nodeValue;
      $ltp = $xpath->query('tr', $e)[$n]->childNodes[4]->nodeValue;
      $open = $xpath->query('tr', $e)[$n]->childNodes[6]->nodeValue;
      $high = $xpath->query('tr', $e)[$n]->childNodes[8]->nodeValue;
      $low = $xpath->query('tr', $e)[$n]->childNodes[10]->nodeValue;
      $ycp = $xpath->query('tr', $e)[$n]->childNodes[12]->nodeValue;
      //$trade = $xpath->query('tr', $e)[$n]->childNodes[14]->nodeValue;
      //$value = $xpath->query('tr', $e)[$n]->childNodes[16]->nodeValue;
      $volume = $xpath->query('tr', $e)[$n]->childNodes[18]->nodeValue;

      if($ycp>0){
        $percentage=(($ltp-$ycp)/$ycp);
      } else {
        $percentage = 0;
      }
  
      $a[] = [
                'scrip_id'=>$scrip,
                'exchange'=>'CSE', 
                'category_id'=>'X',
                'buy_quantity'=>'0',
                'buy_price'=>'0',
                'sale_quantity'=>'0',
                'sale_price'=>'0',
                'ltp'=>$ltp, 
                'change'=>$ltp-$ycp,
                'imgs'=>'0',
                'percentage'=>$percentage,
                'volume'=>$volume,
                'time'=>'0',
                'high_price'=>$high, 
                'low_price'=>$low, 
                'market_pe'=>'0',
                'ycp'=>$ycp, 
                'open_price'=>$open,
                'close_price'=>'0'
              ];
  
    }
    

   $data =  json_encode($a);
   echo json_encode($data);
  
  }
   

 }