PHP distance函数代码示例

function bearing($lat1, $lon1, $lat2, $lon2)
{
    if (round($lon1, 1) == round($lon2, 1)) {
        if ($lat1 < $lat2) {
            $bearing = 0;
        } else {
            $bearing = 180;
        }
    } else {
        $dist = distance($lat1, $lon1, $lat2, $lon2, 'N');
        $arad = acos((sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($dist / 60))) / (sin(deg2rad($dist / 60)) * cos(deg2rad($lat1))));
        $bearing = $arad * 180 / pi();
        if (sin(deg2rad($lon2 - $lon1)) < 0) {
            $bearing = 360 - $bearing;
        }
    }
    $dirs = array("N", "E", "S", "W");
    $rounded = round($bearing / 22.5) % 16;
    if ($rounded % 4 == 0) {
        $dir = $dirs[$rounded / 4];
    } else {
        $dir = $dirs[2 * floor((floor($rounded / 4) + 1) % 4 / 2)];
        $dir .= $dirs[1 + 2 * floor($rounded / 8)];
        #if ($rounded % 2 == 1)
        #  $dir = $dirs[round_to_int($rounded/4) % 4] . "-" . $dir;
    }
    $var_dist = "";
    #return $dir;
    if (isset($dist)) {
        $var_dist = $dist . " miles";
    }
    return round($bearing, 0) . "&#186; " . $dir . " " . $var_dist;
}

function dpEncode($points)
{
    global $verySmall;
    $maxDist = 0;
    $absMaxDist = 0;
    $dists = array();
    if (count($points) > 2) {
        $stack[] = array(0, count($points) - 1);
        while (count($stack) > 0) {
            $current = array_pop($stack);
            $maxDist = 0;
            for ($i = $current[0] + 1; $i < $current[1]; $i++) {
                $temp = distance($points[$i], $points[$current[0]], $points[$current[1]]);
                if ($temp > $maxDist) {
                    $maxDist = $temp;
                    $maxLoc = $i;
                    if ($maxDist > $absMaxDist) {
                        $absMaxDist = $maxDist;
                    }
                }
            }
            if ($maxDist > $verySmall) {
                $dists[$maxLoc] = $maxDist;
                array_push($stack, array($current[0], $maxLoc));
                array_push($stack, array($maxLoc, $current[1]));
            }
        }
    }
    $encodedPoints = createEncodings($points, $dists);
    $encodedLevels = encodeLevels($points, $dists, $absMaxDist);
    $encodedPointsLiteral = str_replace('\\', "\\\\", $encodedPoints);
    return array($encodedPoints, $encodedLevels, $encodedPointsLiteral);
}

 public function showlist()
 {
     global $G;
     $catid = intval($_GET['catid']);
     $pagesize = intval($_GET['pagesize']);
     $pagesize = $pagesize > 0 ? $pagesize : 20;
     $orderby = trim($_GET['orderby']);
     $orderby = in_array($orderby, array('id', 'sold', 'score')) ? $orderby : 'id';
     $asc = $_GET['asc'] == 1 ? 'ASC' : 'DESC';
     $goodslist = $this->t('goods')->field('*,dsx_distance(' . $this->longitude . ',' . $this->latitude . ',longitude,latitude) as distance')->order("distance ASC,{$orderby} {$asc}")->page($G['page'], $pagesize)->select();
     if ($goodslist) {
         $newlist = array();
         foreach ($goodslist as $list) {
             $list['pic'] = image($list['pic']);
             $list['distance'] = distance($list['distance']);
             $list['dateline'] = @date('Y-m-d', $list['dateline']);
             unset($list['description']);
             $newlist[] = $list;
         }
         $goodslist = $newlist;
     } else {
         $goodslist = array();
     }
     $this->showAppData($goodslist);
 }

function distance($strandA, $strandB)
{
    guardSameStrandLength($strandA, $strandB);
    if (empty($strandA) && empty($strandB)) {
        return 0;
    }
    return (int) areDifferent(substr($strandA, 0, 1), substr($strandB, 0, 1)) + distance(substr($strandA, 1), substr($strandB, 1));
}

function filter_by_loc($coupon_info)
{
    global $search_bar_coupon_distance;
    global $user_location_longitude;
    global $user_location_latitude;
    if (distance($user_location_latitude, $user_location_longitude, $coupon_info->latitude, $coupon_info->longitude) <= $search_bar_coupon_distance) {
        return true;
    }
    return false;
}

function intensity()
{
    $edir = getcwd();
    $efile = $edir . "/event.xy";
    $contents = file($efile);
    $string = implode($contents);
    list($qlon, $qlat, $qdep, $qmag, $ntrig, $etime, $dtime, $qstd, $r_squared, $misfit) = split('[,]', $string);
    $a = -0.05;
    // Distance term
    $b = 1.8385;
    // Magnitude term
    $c = -7.8671;
    // Constant
    $width = (int) (log10($qmag * $qmag) * 100.0) / 100.0;
    $dec = 100;
    $dI = 1.0 / $dec;
    $dy = (int) (log10($qmag * $qmag) * $dec) / $dec;
    $lon_fact = cos($qlat * pi() / 180.0);
    $lon_fact *= $lon_fact;
    $dx = (int) ($dy / $lon_fact) * $dec / $dec;
    $x_mn = (int) ($qlon * $dec) / $dec - $dx;
    $x_mx = (int) ($qlon * $dec) / $dec + $dx;
    $y_mn = (int) ($qlat * $dec) / $dec - $dy;
    $y_mx = (int) ($qlat * $dec) / $dec + $dy;
    $dx2 = 0.1;
    $nx = (int) ($dx / $dx2 * 2) + 1;
    $ny = (int) ($dy / $dx2 * 2) + 1;
    $intensity_file = "intensity_map.xyz";
    $fh = fopen($intensity_file, 'w');
    for ($ix = 0; $ix < $nx; $ix++) {
        $x = $x_mn + $dx2 * (double) $ix;
        for ($iy = 0; $iy < $ny; $iy++) {
            $y = $y_mn + $dx2 * (double) $iy;
            $dist_xy = distance($qlon, $qlat, $x, $y);
            $dist_xyz = sqrt($dist_xy * $dist_xy + $qdep * $qdep);
            $pga = exp($a * $dist_xyz + $b * $qmag + $c);
            fwrite($fh, "{$x} , {$y} , {$pga}, {$dist_xyz} \n");
        }
    }
    $sfile = $edir . "/stations.xyz";
    $contents = file($sfile);
    foreach ($contents as $line_num => $line) {
        list($slon, $slat, $smag, $hid, $tid, $sfile, $ttime, $rtime, $sig, $dis, $pgah[0], $pgaz[0], $pgah[1], $pgaz[1], $pgah[2], $pgaz[2], $pgah[3], $pgaz[3], $pgah[4], $pgaz[4]) = split('[,]', $line);
        for ($j = 0; $j <= 4; $j++) {
            if ($pgah[$j] > $smag) {
                $smag = $pgah[$j];
            }
            if ($pgaz[$j] > $smag) {
                $smag = $pgaz[$j];
            }
        }
        fwrite($fh, "{$slon} , {$slat}, {$smag}\n");
    }
    fclose($fh);
}

function distance($word1, $word2)
{
    if (strlen($word1) == 0) {
        return strlen($word2);
    } elseif (strlen($word2) == 0) {
        return strlen($word1);
    } else {
        $cost = $word1[0] == $word2[0] ? 0 : 1;
        return min(distance(substr($word1, 1), $word2) + 1, distance($word1, substr($word2, 1)) + 1, distance(substr($word1, 1), substr($word2, 1)) + $cost);
    }
}

function efficiency($home_lat, $home_lng, $src_lat, $src_lng, $dst_lat, $dst_lng)
{
    $home_lat = (double) $home_lat;
    $home_lng = (double) $home_lng;
    $src_lat = (double) $src_lat;
    $src_lng = (double) $src_lng;
    $dst_lat = (double) $dst_lat;
    $dst_lng = (double) $dst_lng;
    $src2dst = distance($src_lat, $src_lng, $dst_lat, $dst_lng);
    $home2dst = distance($home_lat, $home_lng, $dst_lat, $dst_lng);
    $home2src = distance($home_lat, $home_lng, $src_lat, $src_lng);
    return ceil($src2dst / ($src2dst + $home2dst + $home2src) * 200);
}

 function filterStoresByDistance($stores, $radius, $lat, $lng, $unit = "K")
 {
     //Check if Store is in the radius
     foreach ($stores as $id => $store) {
         $distance = distance($lat, $lng, $store['lat'], $store['long'], $unit);
         $distance = intval($distance);
         if ($distance <= $radius or $radius == 0) {
             $stores_radius[$id] = $distance;
         }
     }
     //Sort Radius-Store-List for Distance and rebuild stores-Array
     asort($stores_radius);
     foreach ($stores_radius as $id => $store) {
         $stores[$id][placeholder][distance] = $store;
         $stores_tmp[] = $stores[$id];
     }
     return $stores_tmp;
 }

function getAlldetails($id, $lat, $lng)
{
    //! Message Loggin
    comment_message_log('Start of Function : ' . __FUNCTION__);
    //! Data base connection
    $rConnection = dbConnection();
    /*!
     * Check if the database Connection is failed
     */
    if (!$rConnection) {
        //! Message Loggin
        comment_message_log('End of Function : ' . __FUNCTION__);
        return E00010;
    }
    //! Query
    $sQuery = "SELECT * FROM `servicesubcatrelation` a,`ownerservice` b,`servicebranch` c WHERE a.sub_category_id={$id} and a.service_id=b.service_id and b.service_id=c.service_id ";
    //! Executing the query
    $res = mysqli_query($rConnection, $sQuery);
    /*!
     * Check If the Query executed properly
     */
    if ($res) {
        $data = array();
        //! retrieve the result from the result set
        while ($aRow = mysqli_fetch_assoc($res)) {
            if (distance($lat, $aRow['branch_lat'], $lng, $aRow['branch_lng']) < 300) {
                $data[] = $aRow;
            }
        }
        //! Closing the connections
        dbConnectionClose($rConnection);
        //! Message Login
        comment_message_log('Query Executed Successfully.::: ' . $sQuery);
        comment_message_log('End of Function : ' . __FUNCTION__);
        return $data;
    } else {
        comment_message_log('Query Execution failed. ::: ' . $sQuery . ' ::: ' . @mysqli_error($rConnection));
        comment_message_log('End of Function : ' . __FUNCTION__);
        //! Closing the connections
        dbConnectionClose($rConnection);
        return E00100;
    }
}

 public function showlist()
 {
     global $G;
     $pagesize = isset($_GET['pagesize']) ? intval($_GET['pagesize']) : 20;
     $shoplist = $this->t('shop')->field('*,dsx_distance(' . $this->longitude . ',' . $this->latitude . ',longitude,latitude) as distance')->page($G['page'], $pagesize)->order('distance ASC,shopid ASC')->select();
     if ($shoplist) {
         $newlist = array();
         foreach ($shoplist as $list) {
             $list['pic'] = image($list['pic']);
             $list['distance'] = distance($list['distance']);
             $list['description'] = stripHtml($list['description']);
             $newlist[] = $list;
         }
         $shoplist = $newlist;
     } else {
         $shoplist = array();
     }
     $this->showAppData($shoplist);
 }

 public function showmytask()
 {
     global $G, $lang;
     $pagesize = isset($_GET['pagesize']) ? intval($_GET['pagesize']) : 20;
     $tasklist = $this->t('task')->where(array('uid' => $this->uid))->page($G['page'], $pagesize)->order('tid DESC')->select();
     if ($tasklist) {
         $newlist = array();
         foreach ($tasklist as $list) {
             $list['pic'] = image($list['pic']);
             $list['distance'] = distance($list['distance']);
             unset($list['content']);
             $newlist[] = $list;
         }
         $tasklist = $newlist;
     } else {
         $tasklist = array();
     }
     $this->showAppData($tasklist);
 }

function distToSegment($firstPointSegment, $secondPointSegment, $point)
{
    /* нахождение длины отрезка */
    $sizeSegment = distance($firstPointSegment, $secondPointSegment);
    /* нахождение проекции точки $point на отрезке по формуле t = [(p-v) . (w-v)] / |w-v|^2
     * где t - $projection, p - $point, v - $firstPointSegment, w - $secondPointSegment */
    $projection = (($point['X'] - $firstPointSegment['X']) * ($secondPointSegment['X'] - $firstPointSegment['X']) + ($point['Y'] - $firstPointSegment['Y']) * ($secondPointSegment['Y'] - $firstPointSegment['Y'])) / $sizeSegment;
    if ($projection < 0) {
        // если проекция на точке $firstPointSegment
        $pointOnSegment = $firstPointSegment;
    } elseif ($projection > 1) {
        // если проекция на точке $secondPointSegment
        $pointOnSegment = $secondPointSegment;
    } else {
        // если проекция не на границах отрезка
        $pointOnSegment = array('X' => $firstPointSegment['X'] + $projection * ($secondPointSegment['X'] - $firstPointSegment['X']), 'Y' => $firstPointSegment['Y'] + $projection * ($secondPointSegment['Y'] - $firstPointSegment['Y']));
    }
    /* массив с минимальным расстоянием, и расположением точки на отрезке */
    return array('DISTANCE' => sqrt(distance($point, $pointOnSegment)), 'POINT' => $pointOnSegment);
}

function main($lat, $lon, $offset, $date_search, $distance_tolerance)
{
    $rows_per_page = 10;
    $cxn = $GLOBALS['cxn'];
    $sql = "SELECT * FROM user_events\n\t\t\tWHERE end_date >= '{$date_search}'\n\t\t\tORDER BY start_date ASC\n\t\t\tLIMIT {$offset}, {$rows_per_page}";
    $res = mysqli_query($cxn, $sql) or die("could not pull events");
    //echo $sql;
    $count = mysqli_num_rows($res);
    //echo "Count:".$count;
    if ($count == 0) {
        //user has no events!
        $arr = array("status" => 0, "content" => "No events!");
        echo json_encode($arr);
        exit;
    }
    // all results will be appended to this var:
    $search_output = "";
    while ($row = mysqli_fetch_assoc($res)) {
        //event_id	user_id	event_title	event_description	end_date	start_date	date_created	public
        extract($row);
        //echo "pulling event $event_id <br />";
        $query_id = "SELECT * FROM event_address WHERE event_id = '{$event_id}'";
        $res2 = mysqli_query($cxn, $query_id) or die("failed to pull address");
        $row_addy = mysqli_fetch_assoc($res2);
        //address_id	event_id	address_text	x_coord	y_coord
        extract($row_addy);
        $distance = distance($x_coord, $y_coord, $lat, $lon, "m");
        /* after everything is extracted:
        			assemble the event and make the html output
        			*/
        if ($distance <= $distance_tolerance) {
            $all_vars = array("event_id" => $event_id, "user_id" => $user_id, "event_description" => $event_description, "event_title" => $event_title, "start_date" => $start_date, "end_date" => $end_date, "venue_address" => $address_text, "lat" => $x_coord, "lon" => $y_coord, "distance" => $distance, "search_output" => $search_output, "isContactInfo" => $is_contactable, "contactInfo" => $contact_info, "contactType" => $contact_type);
            $search_output = search_output_func_users($all_vars);
            //see search_functions.php
        }
    }
    $content_array = array("status" => 1, "content" => $search_output);
    return $content_array;
}

function lookUp($loc, $mask, $pdo, $SENDER_URL, $APP_INFO)
{
    $user = getUser($mask, $pdo);
    $list = getMatchList($mask, $pdo);
    if (getUser($mask, $pdo)["friendMask"] != 'nill') {
        sendReply("Your friend has left the conversation.", getFMask($mask, $pdo), $SENDER_URL, $APP_INFO);
        sendReply(exitCoversation($mask, $pdo), $mask, $SENDER_URL, $APP_INFO);
    }
    $found = FALSE;
    foreach ($list as $listUser) {
        if (distance($listUser["lat"], $listUser["longi"], $user["lat"], $user["longi"], "K") <= 10) {
            updateFriend($mask, $listUser["mask"], $pdo);
            updateFriend($listUser["mask"], $mask, $pdo);
            $user = $listUser["username"];
            $found = TRUE;
            break;
        }
    }
    if ($found) {
        return "You have been matched up with {$user}.\n Type FSTR M <message> and send it to 77100 to start the conversation.";
    } else {
        return "Sorry no match found, please try again later.";
    }
}