Checks if within a defined box based on longitude and latitude

geo_location.php

<?php
$url                 = 'https://api.smartystreets.com/street-address?';
$url                .= 'auth-id=[auth-id]&auth-token=[auth-token]';
$url                .= '&street=' . $street . '&zipcode=' . $zip;
$urlData             = json_decode(file_get_contents($url),true);

//print_r($urlData);
if(isset($urlData[0]['metadata']['latitude'])) {
	$latitude   = $urlData[0]['metadata']['latitude'];
	$longitude   = $urlData[0]['metadata']['longitude'];
	//latitude check
	if(($latitude<$latitudeTopLeft)&&($latitude>$latitudeBottomLeft)) {
		//longitude check
		if(($longitude>$longitudeTopLeft)&&($longitude<$longitudeTopRight)) {
			$zone = true;
		}
	}

}
else {
	$zone  = false;
}