session variable in select query - php

Question

<?php
{
session_start();
include "dbconnect.php";
echo "email=".$_SESSION['email'];
$result = mysql_query("SELECT uid FROM master WHERE emailid='{$_SESSION['email']}'");
while($uid = mysqli_fetch_array($result))
{
echo $row[uid];
}
it is giving result for 1st echo ie email but for 2nd the error is
email=asdas#g.com
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, resource given in C:\xampp\htdocs\mymainproject\upload1.php on line 9
please help

Answer 1

You're using mysql_query and mysqli_fetch_array functions which belong to different database drivers.
You should choose one. In this case - it's mysqli.
PS: the first curly brace { right after <?php looks weird

Answer 2

Here are a few examples:
// restricted/dbconnect.php
<?php
function db(){
return new mysqli('host', 'username', 'password', 'database');
}
?>
// mysqli::fetch_object()
<?php
session_start();
if(isset($_SESSION['email'])){
include 'restricted/dbconnect.php'; $db = db();
$result = $db->query("SELECT uid FROM master WHERE emailid='{$_SESSION['email']}'");
if($result->num_rows > 0){
while($row = $result->fetch_object()){
echo "<div>column name:{$row->columnName}</div><div>other column name:{$row->otherColumnName}</div>";
}
}
else{
echo 'No results were found';
}
$result->free(); $db->close();
}
else{
header('LOCATION:otherpage.php'); die();
}
?>
// mysqli::fetch_assoc()
<?php
session_start();
if(isset($_SESSION['email'])){
include 'restricted/dbconnect.php'; $db = db();
$result = $db->query("SELECT uid FROM master WHERE emailid='{$_SESSION['email']}'");
if($result->num_rows > 0){
while($row = $result->fetch_assoc()){
echo "<div>column name:{$row['columnName']}</div><div>other column name:{$row['otherColumnName']}</div>";
}
}
else{
echo 'No results were found';
}
$result->free(); $db->close();
}
else{
header('LOCATION:otherpage.php'); die();
}
?>
// mysqli::fetch_row()
<?php
session_start();
if(isset($_SESSION['email'])){
include 'restricted/dbconnect.php'; $db = db();
$result = $db->query("SELECT uid FROM master WHERE emailid='{$_SESSION['email']}'");
if($result->num_rows > 0){
while($row = $result->fetch_row()){
echo "<div>column name:$row[0]</div><div>other column name:$row[1]</div>";
}
}
else{
echo 'No results were found';
}
$result->free(); $db->close();
}
else{
header('LOCATION:otherpage.php'); die();
}
?>
Using the Object Oriented approach will save you typing. Note that you can put single dimensional Numeric Arrays inside double quotes without curly braces.

Answer 3

just use mysqli_query instead. i recommend switching to pdo, its easier to pass variables.
http://net.tutsplus.com/tutorials/php/php-database-access-are-you-doing-it-correctly/