<?php
############################################################
# \-\-\-\-\-\-\ AzDG - S C R I P T S /-/-/-/-/-/-/ #
############################################################
# Written by AzDG (support@azdg.com) #
# Created 23/04/07 Last Modified 23/04/07 #
# Scripts Home: http://www.azdg.com #
############################################################
# File name ZIPLocator.php #
# File purpose Class for ZIP distance count #
# File created by AzDG <support@azdg.com> #
############################################################
# Idea from http://www.sanisoft.com "zipLocator" algorithm
# License LGPL
############################################################
class ZIPLocator
{
var $Table;
var $Round = '2';
function ZIPLocator($Table)
{
$this->Table = $Table;
}
function cb($ss)
{
# Security on incoming data - never believe to anyone :)
# Don`t check for intval(), because zip codes can be also a non-numeric!
return trim(htmlspecialchars(stripslashes($ss)));
}
function distance($zip1,$zip2)
{
$lat = $lon = array();
$tmp = mysql_query('SELECT * FROM '.$this->Table.' WHERE zipcode IN ('.$this->cb($zip1).','.$this->cb($zip2).')');
$cnt = mysql_num_rows($tmp);
if($cnt < 2)
{
return "One or both Zip Codes not found";
}
else
{
while($i = mysql_fetch_array($tmp))
{
$lat[] = $i['lat'];
$lon[] = $i['lon'];
}
$lat[0] = $this->deg_to_rad($lat[0]);
$lon[0] = $this->deg_to_rad($lon[0]);
$lat[1] = $this->deg_to_rad($lat[1]);
$lon[1] = $this->deg_to_rad($lon[1]);
$delta_lat = $lat[1] - $lat[0];
$delta_lon = $lon[1] - $lon[0];
$temp = pow(sin($delta_lat/2.0),2) + cos($lat[0]) * cos($lat[1]) * pow(sin($delta_lon/2.0),2);
$EARTH_RADIUS = 3956;
$distance = $EARTH_RADIUS * 2 * atan2(sqrt($temp),sqrt(1-$temp));
return round($distance,$this->Round);
}
}
function deg_to_rad($deg)
{
$radians = 0.0;
$radians = $deg * M_PI/180.0;
return($radians);
}
function inradius($zip,$radius)
{
$lat = $lon = '';$zips = array();
$tmp = mysql_query('SELECT * FROM '.$this->Table.' WHERE zipcode = '.$this->cb($zip));
$cnt = mysql_num_rows($tmp);
if(!$tmp)
{
return "Zip Code not found";
}
else
{
while($i = mysql_fetch_array($tmp))
{
$lat = $i['lat'];
$lon = $i['lon'];
}
$tmp2 = mysql_query('SELECT zipcode FROM '.$this->Table.' WHERE (POW((69.1*(lon-'.$this->cb($lon).')*cos('.$this->cb($lat).'/57.3)),2)+POW((69.1*(lat-'.$this->cb($lat).')),2))<('.$this->cb($radius).'*'.$this->cb($radius).')');
$cnt2 = mysql_num_rows($tmp2);
if($cnt2)
{
while($i = mysql_fetch_array($tmp2))
{
$zips[]=$i['zipcode'];
}
}
else
{
return "Zip Code not found";
}
return $zips;
}
}
}
?>
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