config_check.php at GG-Tracker GPS and GSM Tracking

<?php

//**********************************************************************************************
//*****                             CHECK CONFIGURATION                                   ******
//**********************************************************************************************

//Be positive, assume no erros
$failure = false; 

//Prepare a simple html possible error document
$error = "<html>
	<head>
    <title>GG-Tracker (GSM and GPS location combined)</title>
  </head>

  <body>
  
  <font face=\"Verdana\">
    <h1>GG-Tracker has errors!</h1>\r\n\r\n";

//Check Google Maps key
if (empty($gmaps)) {
	$error .=  "    Please enter your Google Maps key in config.php<p>\r\n";
	$failure = true;
}

//Check when period is filled if there is a history file present as well
if (!empty($gearthperiod) && empty($gearthfile)) {
	$error .= "    If you set a period to calculate the history, "
		     ."please also define a history file in config.php<p>\r\n";
	$failure = true;
}

//Check when history is required, check if period is valid
if (!empty($gearthfile)) {
	if (($gearthperiod <> "today") && ($gearthperiod <> "yesterday") && ($gearthperiod <> "week") && 
		($gearthperiod <> "month") && ($gearthperiod <> "year")) {
		$error .= "    Please enter the correct period for calculating the history in config.php<p>\r\n";
		$failure = true;	
	}
} 

//Check if a phone is set for authentication
if (empty($cphone)) {
	$error .= "    Please enter the IMEI of your phone in config.php<p>\r\n";
	$failure = true;
}

//Check if threshold has a normal value
if (($ant_threshold < 1) || ($ant_threshold > 10)) {
	$error .= "    Please check the antenna threshold in config.php<p>\r\n";
	$failure = true;
}

//Check MySQL credentials
if ((empty($dbhost)) || (empty($dbname)) || (empty($dbpass)) || (empty($dbuser))) {
	$error .= "    Please set your MySQL credentials in config.php<p>\r\n";
	$failure = true;
}

//Check CellDB credentials if appropriate
if ($celldb) {
	if ((empty($cduser)) || (empty($cdhash))) {
		$error .= "    Please set your CellDB credentials in config.php<p>\r\n";
		$failure = true;
	} 	
}

if ($failure) {
	$error .= "    <font color=red>GG-Tracker terminated abnormally!</font>\r\n";
  $error .= "  </font>\r\n\r\n";
	$error .= "  </body>\r\n";
	$error .= "</html>";
	
	echo $error;
	exit;
};

?>