Validate a waypoint whether it's a lat lng or a postcode. postcodeToLatLng() refers to another gist.

validate_waypoint.php

<?php
// ****************************************
// * Validate waypoint whether it's latlng or postcode
// ****************************************
function validateWaypoint($waypoint) {
    if (strpos($waypoint, ",")) {
        // ? Probably lat lng
        $latLng = explode(",", $waypoint);
        if (count($latLng) == 2) {
            if ($latLng[0] >= -90 && $latLng[0] <= 90) {
                if ($latLng[1] >= -180 && $latLng[1] <= 180) {

                    $getNearPostcode = json_decode(@file_get_contents("https://api.postcodes.io/postcodes?lon={$latLng[1]}&lat={$latLng[0]}"), true);
                    if ($getNearPostcode && $getNearPostcode['status'] == 200 && $getNearPostcode['result'] != null) {
                        $postcode = $getNearPostcode['result'][0]['postcode'];
                    } else $postcode = '';
                
                    return [$postcode, $latLng];
                } else return false;
            } else return false;
        } else return false;
    } else {
        // ? Probably postcode
        $validatePostcode = postcodeToLatLng($waypoint);
        if ($validatePostcode[0] != "FAIL") {
            return [$waypoint, $validatePostcode];
        } else return false;
    }
}
// ****************************************




// ****************************************
// * Geocode one single postcode.
// ****************************************
function postcodeToLatLng($postcode) {
    include '../../../GLOBAL_HANDLERS/DatabaseHandler.php';
    $po = rtrim(ltrim(strtoupper(str_replace(' ', '', $postcode)))); // Pre-validate postcodes.

    // Check if the postcode is within our database.
    $getLatLng = $GLOBAL->prepare("SELECT lat, lng FROM `uk_postcodes` USE INDEX(`postcodes`) WHERE `postcode` LIKE ? LIMIT 1");
    $getLatLng->bind_param("s", $po);
    $getLatLng->execute();
    $result = $getLatLng->get_result();
    
    // If the SQL query returned a record.
    if ($result->num_rows > 0) {
        $location = $result->fetch_assoc();
        return [round($location['lat'], 6), round($location['lng'], 6)];
    } else {
        // If the postcode isn't in our database then check the api.
        // The api will also check the validity with the composer package.
        $response = json_decode(@file_get_contents('https://api.postcodes.io/postcodes/' . urlencode($po)), true);
        if ($response != false && $response['status'] == 200) {
            return [round($response['result']['latitude'], 5), round($response['result']['longitude'], 5)];
        } else {
            $url = "https://maps.googleapis.com/maps/api/geocode/json?address=" . urlencode($postcode) . "&key=AIzaSyBZr-Aaq5G2cUYe2qxW8xznEgSBnJsQIWM";
            
            $curl = curl_init($url);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($curl, CURLOPT_HEADER, false);
            $response = curl_exec($curl);
            $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
            curl_close($curl);
            
            if ($status == 200) {
                $googleResponse = json_decode($response, true);

                if ($googleResponse['status'] == 'OK') {
                    return [round($googleResponse['results'][0]['geometry']['location']['lat'], 5), round($googleResponse['results'][0]['geometry']['location']['lng'], 5)];

                } else return['FAIL', 'FAIL'];
            } else return['FAIL', 'FAIL'];
        }
    }

    return ['FAIL', 'FAIL'];
}
// ****************************************
?>