Haversine Method for model Laravel.

haversine.php

<?php
    /*
     *  find the n closest locations
     *  @param Model $query eloquent model
     *  @param float $lat latitude of the point of interest
     *  @param float $lng longitude of the point of interest
     *  @param float $max_distance distance in miles or km
     *  @param string $units miles or kilometers
     *  @param Array $fiels to return
     *  @return array
     */
     public static function haversine($query, $lat, $lng, $max_distance = 25, $units = 'miles', $fields = false )
     {
        
     	if(empty($lat)){
     		$lat = 0;
     	}

     	if(empty($lng)){
     		$lng = 0;
     	}

        /*
         *  Allow for changing of units of measurement
         */
        switch ( $units ) {
            case 'miles':
                //radius of the great circle in miles
                $gr_circle_radius = 3959;
            break;
            case 'kilometers':
                //radius of the great circle in kilometers
                $gr_circle_radius = 6371;
            break;
        }

        /*
         *  Support the selection of certain fields
         */
        if( ! $fields ) {
            $fields = array( 'users.*', 'users_profile.*', 'users.username as user_name' );
        }

        /*
         *  Generate the select field for disctance
         */
        $distance_select = sprintf(
					                "           
					                ROUND(( %d * acos( cos( radians(%s) ) " .
					                        " * cos( radians( lat ) ) " .
					                        " * cos( radians( lng ) - radians(%s) ) " .
					                        " + sin( radians(%s) ) * sin( radians( lat ) ) " .
					                    " ) " . 
					                ")
        							, 2 ) " . 
					                "AS distance
					                ",
					                $gr_circle_radius,               
					                $lat,
					                $lng,
					                $lat
						           );
       	
  		$data = $query->select( DB::raw( implode( ',' ,  $fields ) . ',' .  $distance_select  ) )
  					  ->having( 'distance', '<=', $max_distance )
  					  ->orderBy( 'distance', 'ASC' )
  					  ->get();			          
  
  		//echo '<pre>';
    	//echo $query->toSQL();
    	//echo $distance_select;
    	//echo '</pre>';	
    	//die();	
    	//
  		//$queries = DB::getQueryLog();
  		//$last_query = end($queries);
  		//var_dump($last_query);
  		//die();
		return $data;
    }