select query not workin - php

Question

the problem was that in the config file was mysql so i change it to mysqli
but now i cant see the result in the select in the html area
this is the php script
<?php
require 'config.php';
$query = "SELECT cat_id, category FROM categories LIMIT 1";
$result = mysqli_query($con,$query);
if(!$result){
echo 'Query failed : '.mysqli_error();
exit(0);
}
$row = mysqli_fetch_assoc($result);
// mysql_fetch_assoc was the problem print_r($row);
mysql_close($con);
?>
this is the html script
<select name="cat_id"> </select>
this is thr error
Warning: mysqli_query() expects parameter 1 to be mysqli, resource
given in /home/content/60/10533160/html/cms/in.php on line 5
Warning: mysqli_error() expects exactly 1 parameter, 0 given in
/home/content/60/10533160/html/cms/in.php on line 7 Query failed :

Answer 1

it looks like you used mysql not mysqli for your connection.
maybe you should change that, as it says mysqli_query() expects parameter 1 to be mysqli

Answer 2

Your first error is caused because mysqli_fetch_assoc() needs two parameters, a database name and parameter two to be the array you wish to fetch.
Your code should be (presuming $con is the database connection):
mysqli_fetch_assoc($con,$result);
Your second error is simply caused because mysqli_error() expects 1 parameter: The database connection, but you connected with mysql.*. Don't mix the two libraries. mysqli has many improvements over the original mysql extension, so it is recommended that you use mysqli.
Make sure to do some research on Google before asking a question here.

Answer 3

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Perform queries
mysqli_query($con,"SELECT * FROM Persons");
mysqli_query($con,"INSERT INTO Persons (FirstName,LastName,Age)
VALUES ('Glenn','Quagmire',33)");
mysqli_close($con);
?>
This example is useful for you...