php - prepared statements UPDATE -

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i getting below error when try update query using mysqli prepared statements. wrong error message why unexpected? help.

parse error: syntax error, unexpected '$prob' (t_variable)

here query

$mysqli = new mysqli("localhost", "root", "", "newlogin");         if ($mysqli->connect_errno) {         echo "failed connect mysql: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;         }         $check = $mysqli->prepare("select * `vpb_uploads` `username` = ? , `firstname` = '' , `image_one` != ''");         $check->bind_param('s', $username);         $check->execute();         $check->store_result();          if($check->num_rows < 1)         {             echo '<div class="vpb_error_info" align="left">sorry, seems have not added file yet.<br>please click on add files button first of add @ least 1 file before submitting details. thanks...</div>';         }         else         {         $firstname = trim(strip_tags($_post["firstname"]));         $lastname = trim(strip_tags($_post["lastname"]));          if( $prob = $mysqli->prepare("update `vpb_uploads` set `firstname` = ?, `lastname` = ? `username` = ? , `firstname` = '' , `image_one` != ''")         $prob->bind_param('sss', $firstname, $lastname, $username);         $prob->execute();         )          {                 echo '<font style="font-size:0px;">success</font>';                 echo '<div class="vpb_error_info" align="left">congrats <b>'.$firstname.' '.$lastname.'</b>, details have been submitted successfully. thanks...</div>';         }

try code:

$mysqli = new mysqli("localhost", "root", "", "newlogin"); if ($mysqli->connect_errno) {     echo "failed connect mysql: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error; } $check = $mysqli->prepare("select * `vpb_uploads` `username` = ? , `firstname` = '' , `image_one` != ''"); $check->bind_param('s', $username); $check->execute(); $check->store_result();  if($check->num_rows < 1){      echo '<div class="vpb_error_info" align="left">sorry, seems have not added file yet.<br>please click on add files button first of add @ least 1 file before submitting details. thanks...</div>'; } else {     $firstname = trim(strip_tags($_post["firstname"]));     $lastname = trim(strip_tags($_post["lastname"]));      $prob = $mysqli->prepare("update `vpb_uploads` set `firstname` = ?, `lastname` = ? `username` = ? , `firstname` = '' , `image_one` != ''") ;     if ($prob){         $prob->bind_param('sss', $firstname, $lastname, $username);         $success = $prob->execute();         if ($success){             echo '<font style="font-size:0px;">success</font>';             echo '<div class="vpb_error_info" align="left">congrats <b>'.$firstname.' '.$lastname.'</b>, details have been submitted successfully. thanks...</div>';         }      } }

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