Validacion de input.

dbcleaner.php

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+<?php
+	//Description: When activated this script will remove any old entries from db.txt.
+	
+	date_default_timezone_set('America/Puerto_Rico'); //Changes the default timezone of the script to Puerto Rico. 
+	$time = date("h:i:s",strtotime('-15 seconds')); //Stores the current time minus the a certain amount of time.
+	$db = file('/var/www/html/db.txt'); //Access db.txt and stores each line into an array. 
+	$fsize = count($db); //Get the size of the db array.
+	$change = False; //Boolian used to indicate if the file had to be changed. 
+	for($i = 0;$i < $fsize; $i++) //Loop that will iterate through the db array.
+	{
+		$decode =  json_decode($db[$i]); //Gets the jsons stored in db and decodes them. 
+		if(date("h:i:s",strtotime($decode->inTime)) < date("h:i:s",strtotime($time))) //Compares if the inTime of stored in each json is less than the one in the time variable. 
+		{
+			unset($db[$i]);//Removes the json in db[i].
+			$change = True;//Indicates that their was change in db.
+		}
+	}
+	if ($change == True)//Check if there was a change in db.
+	{
+		file_put_contents("/var/www/html/db.txt", $db);//Rewrites the db.txt with the contents of db.
+	}
+
+?>

dberase.php

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+<?php
+	//Description:	When activated, this script will erase everything in db.txt. 
+	//		Cron will periodically activate this script everyday at 00:00:00.
+
+	file_put_contents("/var/www/html/db.txt", ""); //Deletes everything from db.txt.
+?>

receiver.php

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+<?php
+	//Description:	This script will receive jsons from the application.
+	//		After validating a json it will store it in db.txt.
+	//		When activated this script will also activate dbcleaner.php.
+	include 'dbcleaner.php'; //Will activate dbcleaner.php script everyday.
+
+	function read_and_delete_first_line($filename) //This function will delete the first line of db.txt.
+        {
+                $file = file($filename); //Makes the contents of db.txt into an array.
+                array_shift($file); //Removes the first element of the array.
+                file_put_contents($filename, $file); //Rewrites db.txt with the contents of the array.
+        }
+	date_default_timezone_set('America/Puerto_Rico'); //Changes the default time of this PHP script to Puerto Rico.
+        $decoded_location  = json_decode(file_get_contents('php://input')); //Receives input from app and decodes the json recived.
+	//$f = file("unused/testinput.txt");//For testing purposes.
+	//$decoded_location  = json_decode($f[0]); //For testing purposes.
+	if(isset($decoded_location->latitude) && isset($decoded_location->longitude)) //Checks if the decoded json contains latitude and longitude keys. If false the json will be discarted.
+	{
+		if(is_float($decoded_location->latitude) && is_float($decoded_location->longitude))//Checks if the values of latitudes and longitudes are floating numbers. If false the json will be discarted.
+		{	
+			if(($decoded_location->latitude >= -90 && $decoded_location->latitude <= 90) && ($decoded_location->longitude >= -180 && $decoded_location->longitude <= 180)) //Checks if the latitude and longitude values are in the range of real latitudes and longitudes. A latitude cannot exceed from the range (-90,90); A longitude cannot exceed from the range (-180,180). If false the json will be discarted.
+			{
+				$decoded_location->inTime = date('h:i:s a',time()); //Adds a new property to the object we get after decoding the json and stores the current time.
+				$encoded_location = json_encode($decoded_location); //Reencodes the object back into a json with the new inTime property.
+        			$file = 'db.txt';
+        			$totalLines = intval(exec("wc -l '$file'")); //Counts how many lines db.txt has.
+        			//echo $totalLines. "\n"; //For testing purposes
+        			if($totalLines > 24) //If db.txt has more than a specified amount of lines, it will delete the first line of db.txt.
+				{
+					read_and_delete_first_line($file);
+				}
+				$db = fopen("db.txt","a") or die("FAILED TO ACCESS DATABASE"); //Opens db.txt in append mode. If it somehow fails to open the database, an error message will be displayed.
+				fwrite($db,$encoded_location. "\n"); //Writes the newly encoded json into db.txt.
+				fclose($db); //Closes db.txt
+        			//$totalLines = intval(exec("wc -l '$file'")); //For testing purposes
+				//echo $totalLines; //For testing purposes
+			}
+		}
+	}
+?>