mysql - PHP syntax error or access violation: 1064 - using variable in where clause -

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pulling hair out on one, i've tried number of things in terms of changing escape characters variable , nothing working including changing '". $r."' etc.

if hard code variable constant works. e.g $r = "word";

i've renamed variables random letters in case reserved words.

i've gone far setting logging mysql , have compared statements , they're identical, difference being 1 submitted via text box , other has been set constant.

model:

 public static function searchprofile()     {     $r = request::post('w');     $args = "";     if ($r) {$args = "`info_tradingstatus` = '$r'";}     $database = databasefactory::getfactory()->getconnection();     $sql = "select profile_id, profile_name profile_seeker $args";

view:

  <input type="text" name="w" class="form-control" placeholder="enter keyword" aria-describedby="basic-addon1">

controller:

public function search_action() { profilemodel::searchprofile( request::post('w'), redirect::to('profile/searchresults')); }

hi think problem when $r empty, please try:

public static function searchprofile()     {     $r = request::post('w');     $args = " 1 ";     if ($r) {$args = "`info_tradingstatus` = '".$r."'";} // in case     $database = databasefactory::getfactory()->getconnection();     $sql = "select profile_id, profile_name profile_seeker $args";

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