trolley/reciver.php

<?php
	function read_and_delete_first_line($filename)
	{
		$file = file($filename);
		array_shift($file);
		file_put_contents($filename, $file);
	}
	$decoded_location  = json_decode(file_get_contents('php://input'));
	$inTime = gmdate('H:i:s',time());
	$file = 'db.txt';
	$totalLines = intval(exec("wc -l '$file'"));
	//echo $totalLines. "\n"; //For testing purposes
	if($totalLines > 15)
	{
		read_and_delete_first_line("db.txt");
	}

	$db = fopen("db.txt","a") or die("FAILED TO ACCESS DATABASE");
	fwrite($db,$decoded_location->latitude. "\t". $decoded_location->longitude. "\t". $inTime. "\n");
	fclose($db);
	//$totalLines = intval(exec("wc -l '$file'")); //For testing purposes
	//echo $totalLines; //For testing purposes
?>