/get_current_data.php

<?php
if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler"); else ob_start();
header('Cache-Control: no-cache, must-revalidate');
header('Content-type: application/json'); 



$file = './data/tmp/data.tmp';

if (file_exists($file) && (filectime($file) > (time() - 7))) {
  echo file_get_contents($file);
} else {
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, "http://www.quadrant-atc.net/data.js");
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	$data = curl_exec($ch);
	curl_close($ch);
	
	$lines = explode('-',$data);
	//print_r($lines);
	$data = null;
	foreach ( $lines as $line ) {
		$pattern = '@track\("(\w{3,9})\s*["]{1}[,]{1}([0-9\. ]{10})[,]{1}([0-9\. ]{11})[,]{1}(\d{1,3})[,]{1}(\d{1,4})[,]{1}(\d{1,3}).*@';	
		preg_match_all($pattern, $line, $data_add);
		$pattern = '@deltrack\("(\w{3,9})\s*"\);@';	
		preg_match_all($pattern, $line, $data_del);
	}
		
	for ( $i = 0; $i < count($data_add[0]); $i++) {
		if (is_array($data_add[1][$i])) {
			$entries[$data_add[1][$i]]['lat'] = ($entries[$data_add[1][$i]]['lat'] + trim($data_add[2][$i])) / 2;
			$entries[$data_add[1][$i]]['lon'] = ($entries[$data_add[1][$i]]['lon'] + trim($data_add[3][$i])) / 2;
			$entries[$data_add[1][$i]]['hdg'] = floor(($entries[$data_add[1][$i]]['hdg'] + $data_add[4][$i]) / 2);
			$entries[$data_add[1][$i]]['spd'] = floor(($entries[$data_add[1][$i]]['spd'] + $data_add[5][$i]*0.1944) / 2);
			$entries[$data_add[1][$i]]['alt'] = floor(($entries[$data_add[1][$i]]['alt'] + $data_add[6][$i]) / 2);
		} else {
			$entries[$data_add[1][$i]]['type'] = "add";
			$entries[$data_add[1][$i]]['lat'] = trim($data_add[2][$i]);
			$entries[$data_add[1][$i]]['lon'] = trim($data_add[3][$i]);
			$entries[$data_add[1][$i]]['hdg'] = $data_add[4][$i];
			$entries[$data_add[1][$i]]['spd'] = floor($data_add[5][$i]*0.1944); // *(0.36/1.852) dm/s => kts
			$entries[$data_add[1][$i]]['alt'] = $data_add[6][$i];
		}
	}
	
	for ( $i = 0; $i < count($data_del[0]); $i++) {
		//$entries[$data[1][$i]]['callsign'] = $data_add[1][$i];
		if (!is_array($data_del[1][$i])) {
			$entries[$data_del[1][$i]]['type'] = "delete";
		}
	}

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, "http://www.flightradar24.com/_xml/plane_data3.php");
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 4);
	$data = curl_exec($ch);
	curl_close($ch);
	
	$lines = explode("/n",$data);
	$data = null;
	foreach ( $lines as $line ) {
		//track("AFL315  ",47.7028620,  8.1190306,225,2053,380);
		//$pattern = '@track\("(\w{3,9})\s*["]{1}[,]{1}([0-9\. ]{10})[,]{1}([0-9\. ]{11})[,]{1}(\d{1,3})[,]{1}(\d{1,4})[,]{1}(\d{1,3}).*@';	
		//<marker history=" newpoly 4BD063,LTBA,KYV009,31975,39.42118,30.0614,421,328,,,2010-04-18 20:47:38, " ></marker>
		$pattern = '@newpoly[ ]{1}[A-F0-9]{6}[,]{1}[A-Z0-9]{4,5}[,]{1}(\w{3,9})[,]{1}(\d{1,5})[,]{1}([0-9\. -]{2,10})[,]{1}([0-9\. -]{2,10})[,]{1}(\d{1,4})[,]{1}(\d{1,3})[,]{1}.*[>]{1}@';
		preg_match_all($pattern, $line, $data_add);
	}
		
	for ( $i = 0; $i < count($data_add[0]); $i++) {
		if (is_array($data_add[1][$i])) {
			$entries[$data_add[1][$i]]['lat'] = ($entries[$data_add[1][$i]]['lat'] + trim($data_add[3][$i])) / 2;
			$entries[$data_add[1][$i]]['lon'] = ($entries[$data_add[1][$i]]['lon'] + trim($data_add[4][$i])) / 2;
			$entries[$data_add[1][$i]]['hdg'] = floor(($entries[$data_add[1][$i]]['hdg'] + $data_add[6][$i]) / 2);
			$entries[$data_add[1][$i]]['spd'] = floor(($entries[$data_add[1][$i]]['spd'] + $data_add[5][$i]*0.1944) / 2);
			$entries[$data_add[1][$i]]['alt'] = floor(($entries[$data_add[1][$i]]['alt'] + $data_add[2][$i]/100) / 2);
		} else {
			$entries[$data_add[1][$i]]['type'] = "add";
			$entries[$data_add[1][$i]]['lat'] = trim($data_add[3][$i]);
			$entries[$data_add[1][$i]]['lon'] = trim($data_add[4][$i]);
			$entries[$data_add[1][$i]]['hdg'] = $data_add[6][$i];
			$entries[$data_add[1][$i]]['spd'] = floor($data_add[5][$i]*0.1944); // *(0.36/1.852) dm/s => kts
			$entries[$data_add[1][$i]]['alt'] = floor($data_add[2][$i]/100);
		}
	}	
	
	//foreach ( $entries as $key => $entry )
	
	echo $json = json_encode($entries);
	
	//include('statistics/logger.php');
	
	//	print_r($data_add);
		
		
	file_put_contents($file, $json);
}
	
?>