No result from query in PHP [closed] - php

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I have made code without error for connection and data fetching but i don't know why result for query is bool(false)
<?php
$con=mysql_connect("localhost","root","","xyz");
echo "Connection made";
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
The code to query and execution is
<?php
include ("includes/connection.php");
$query="SELECT * FROM userdata ";
$result=mysql_query($query);
var_dump($result);
?>
Help needed here

Answer 1

You should use either mysql or mysqli. This is the main problem for the error
<?php
$con=mysqli_connect("localhost","root","","xyz") or die ("error in connection".mysqli_error($con);
?>
and use $result= mysqli_query($con, $sql) where $sql contains your query

Answer 2

As i stated in the comments, your echo up there to tell you you connected to the mysql server is not effective. I pulled out an old function from me to show you how to do it and make it clear where the error is.
$con = mysql_connect('localhost','root','');
$db = mysql_select_db('xyz',$con);
function OpenConnection(){
global $con;
global $db;
if (!$con){
die('cannot connect to server!');
}else{
if(!$db){
die('cannot connect to database!');
}
}
}
If you dont get anything back, you ll be good to go.

Answer 3

Don't use mysql_* functions they are depracted use mysqli or pdo instead.
You need to fetch results of your query with fetch functions like mysql_fetch_array() or mysql_fetch_row() to get results of your query. There are plenty of examples in PHP manual.
In your cause it would be something like this:
<?php
$con=mysql_connect("localhost","root","") or die("didn't connect to db");
mysql_select_db('name_of_your_db', $con);
$query="SELECT * FROM `userdata` ";
$result=mysql_query($query); //this returns resource ID that needs to be fetched
while($row = mysql_fetch_row($result))
print_r($row);
If $result is false it means that query failed it can be caused by several issues for example there is no DB selected, there is no connection etc.
I'd also give you better solution with PDO
<?php
$dsn = 'mysql:dbname=nameofyourdb;host=127.0.0.1';
$user = 'root';
$password = 'yourpass';
try
{
$db = new PDO($dsn, $user, $password);
foreach ($db->query("SELECT * FROM `userdata`") as $row)
print_r($row);
}
catch (PDOException $e)
{
echo 'Connection failed: ' . $e->getMessage();
}
?>