php - mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in -


already looked @ other answers couldn't fix it. monday i've got school exams , want build basic cms (add, edit, delete pages, resized images). programming knowledge beginner , don't know oop (pdo), design patterns, best practices , kind of things.

as checked query in phpmyadmin looks fine. in header include there connection included.

<?php     include('inc/header.php');     if(isset($_post["submit"])) {         $username = trim($_post["username"]);         $password = trim($_post["password"]);         $password_secure = md5($password);          if($username == "") {             $error++;             $_session["loginerror"] = true;             header("location: loginerror.php");             exit;         }          if($password == "") {             $error++;             $_session["loginerror"] = true;             header("location: loginerror.php");             exit;         }          if($username != "" && $password != "") {             $sql = "select * user username = '".$username."'              , password = '".$password_secure."'";         }          if(mysqli_num_rows($query == 1)) {             $row = mysqli_fetch_array($query);             $_session['username'] = $row["username"];             $_session['firstname'] = $row["firstname"];             $_session['lastname'] = $row["lastname"];             $_session['login'] = true;             header("location: user.php");             exit;         }      } else {         header("location: index.php");         exit;     } ?>

is smart check post request $_server['request_method'] == 'post' instead of isset() , escape sql mysql_real_escape_string in query?

thanks

you forgot execute query

$query = mysqli_query($sql);  $rowcount=mysqli_num_rows($query);

and then

if($rowcount == 1){  // ur stuff }

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