Question

我必须在距离给定纬度/经度值2公里范围内获取附近位置的结果。必须使用Google Places API执行此操作。详细信息请点击此处：

http://code.google.com/apis/maps/documentation/javascript/places.html

他们在javascript中提供了示例代码。但我需要在PHP中使用它。任何人都可以告诉我如何实现它？或者我如何在我的php控制器类中使用相同的javascript代码？ [我正在使用代码点火器框架]。我已经坚持这个问题好几个小时了。如果有人可以提供示例PHP代码，那将是很棒的。非常感谢任何帮助。

以下是我的控制器类的代码：

<?php

class Welcome extends CI_Controller {
    public function index()
    {

    $config = "";

    //$this->load->library('googlemaps');
        $this->load->library('googlemaps');

    $config['center'] = '37.4419, -122.1419';
    $config['zoom'] = 'auto';
    $config['places'] = TRUE;
    $config['placesLocation'] = '37.4419, -122.1419';
    $config['placesRadius'] = 200; 
    $this->googlemaps->initialize($config);

    $data['map'] = $this->googlemaps->create_map();

    $this->load->view('map_view', $data);
    }
}
?>

这是我在尝试运行上述代码时遇到的错误：

致命错误：在第9行的/Applications/XAMPP/xamppfiles/htdocs/ciplaces/application/controllers/mapcontroller.php中不在对象上下文中时使用$ this

我正在使用此网址访问我的代码：

http://localhost/ciplaces/index.php/mapcontroller

谢谢

Answer 1

我有一个与Google Maps和Places API集成的CodeIgniter库。您可以在此处找到信息并下载库：

http://biostall.com/codeigniter-google-maps-v3-api-library

＆＃39;地方＆＃39;整合也可以在下面找到：

http://biostall.com/demos/google-maps-v3-api-codeigniter-library/places

如果您有任何问题或需要对图书馆进行任何更改，请给我一个喊叫，我会很乐意尽我所能帮助。

干杯

Answer 2

我使用块算法在PHP中做了类似的事情。

你应该可以从下面的代码中获得一些东西（坐在我的模型中，但你可以放在任何地方）。

public function search($start_latitude, $start_longitude, $radius, $radius_type, $offset, $limit)
{
    $results = array();
    $locations = array();

    $sql = "SELECT `location_id`, `latitude`, `longitude` FROM `table`";
    $query = $this->db->query($sql);
    if ($query->num_rows() > 0)
    {
        foreach ($query->result() as $row)
        {
            $geo_data = $this->_bearing_distance_calc($start_latitude, $start_longitude, $row->latitude, $row->longitude, $radius_type);
            $geo_data['radius_type'] = $radius_type;
            if($geo_data['distance'] <= $radius)
            {
                // radial serach results
                $locations[] = $row->location_id;
            }
        }

        // return amount requested
        $results['total'] = count($locations);
        $results['locations'] = array_slice($locations, $offset, $limit);
        return $results;
    }
    else
    {
        // no results
        return FALSE;
    }
}

/**
 * Calculate Distance Between two points.
 * 
 * This method is used to calculate the distance between to geographical points. <br />
 * Used by the search method.
 * 
 * @access private
 * 
 * @param float $device_latitude
 * @param float $device_longitude
 * @param float $beach_latitude
 * @param float $beach_longitude
 * @param integer $radius_type
 * 
 * @return array 
 */
private function _bearing_distance_calc($start_latitude, $start_longitude, $building_latitude, $building_longitude, $radius_type)
{
    // using Rhumb lines(or loxodrome)
    // convert to rads for php trig functions
    $start_latitude = deg2rad($start_latitude);
    $start_longitude = deg2rad($start_longitude);
    $building_latitude = deg2rad($building_latitude);
    $building_longitude = deg2rad($building_longitude);

    // testing variables
    //$start_latitude = deg2rad(39.4422);
    //$start_longitude = deg2rad(-122.0307);
    //$building_latitude = deg2rad(49.4422);
    //$building_longitude = deg2rad(-112.0307);

    // calculate delta of lat and long
    $delta_latitude = $building_latitude-$start_latitude;
    $delta_longitude = $building_longitude-$start_longitude;

    // earth radius
    if ($radius_type == 'miles') // using miles
    {
        $earth_radius = 3959;
    }
    else // using kilometers
    {
        $earth_radius = 6371;
    }

    // now lets start mathing !!
    // cast types
    $dPhi = log(tan($building_latitude/2+M_PI/4)/tan($start_latitude/2+M_PI/4));
    if ($dPhi != 0)
    {
        $q = $delta_latitude/$dPhi;
    }
    else
    {
        $q = cos($start_latitude);
    }
    //$q = (!is_nan($delta_latitude/$dPhi)) ? $delta_latitude/$dPhi : cos($start_latitude);  // E-W line gives dPhi=0   
    // if dLon over 180° take shorter rhumb across 180° meridian:
    if (abs($delta_longitude) > M_PI)
    {
        $delta_longitude = $delta_longitude>0 ? -(2*M_PI-$delta_longitude) : (2*M_PI+$delta_longitude);
    }

    $geo_data = array();
    $geo_data['distance'] = sqrt($delta_latitude*$delta_latitude + $q*$q*$delta_longitude*$delta_longitude) * $earth_radius;
    $bearing = rad2deg(atan2($delta_longitude, $dPhi));

    if($bearing < 0)
    {
        $bearing = 360 + $bearing;
    }
    $geo_data['bearing'] = $bearing;

    return $geo_data;
}

使用google places api在php / codeigniter中获取附近的位置

2 个答案: