php - Query based on dropdown selection with google maps GeoLocation -


i trying run query based on dropdown value posted html can't manage work.

this html: 

<form action="" method="post">         <select name="nearest">                 <option name="distance" value="5">5km</option>                 <option name="distance" value="10">10km</option>                 <option name="distance" value="25">25km</option>                 <option name="distance" value="50">50km</option>                 <option name="distance" value="100">100km</option>             </select>         <input type="submit" name="filternow" value="filter" id="filterbutton">     </form>

this php:

if (isset($_post['filternow'])){     $selecteddistance = $_post['nearest'];     $q =  "select id, name, image_url, description, price, lat, lng, rating, owner, free, city, round(( 6371 * acos( cos( radians(" . $_post['userlat']   . ") ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(" . $_post['userlng'] . ") ) + sin( radians(" . $_post['userlat'] . ") ) * sin( radians( lat ) ) ) ), 2) distance places having distance < " . $selecteddistance . " order distance asc";     $res1 = mysqli_query($linknew, $q); }         echo "<h2>nearest places</h2>";     while($row1 = mysqli_fetch_array($res1)){         echo "<h2>" . $row1[1] . "</h2><br />";      }

if replace $selecteddistance number , remove form in html , if-loop in php, shows me places within amount of kilometers, doesnt work dropdown

this may causing issue.

the option tag not have name attribute change them :- 

<option value="5">5km</option>

also if ever issues data passed script using $_post or $_get dump $_post/get onto browser , have @ in using var_dump($_post);

so before line add var_dump

var_dump($_post); if (isset($_post['filternow'])){

and $_post displayed on browser, or preference

echo '<pre>' . print_r($_post, true) . '</pre>'; if (isset($_post['filternow'])){

if probelem not obvious add dumped output question , can have guess.


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