I got the warning mentioned in the title and my code is here:Warning: mysqli_select_db() expects parameter 1 to be mysqli, string given in

Question

I got the warning mentioned in the title and my code is here:Warning: mysqli_select_db() expects parameter 1 to be MySQLi, string given in /CDC/slider.php on line 3

slider.php

<?php require_once('db/dbcon.php'); ?>

<?php mysqli_select_db($database_dbcon, $dbcon);
$query_slide ="SELECT * FROM photos_slide_tb";
$slide  = mysqli_query($query_slide , $dbcon) or die(mysqli_error());
$row_slide = mysqli_fetch_assoc($slide );
$totalRows_slide  = mysqli_num_rows($slide ); ?>

    <div id="sliderFrame">
        <div id="slider">
        <?php if ($totalRows_slide == 0) { ?><h1>&nbsp;</h1>
            <h1 align="center">Not available</h1>

        <?php } else do { ?> 
            <img src="photos/<?php echo $row_slide['location'];?>"  alt="<?php echo $row_slide['caption'];?>" />
        <?php } while ($row_slide = mysqli_fetch_assoc($slide)); ?>
        </div>

        <div id="htmlcaption" style="display: none;">
        </div>
    </div>

---

dbcon.php

<?php
$hostname_dbcon = "localhost";
$database_dbcon = "123";
$username_dbcon = "123";
$password_dbcon = "123";
$dbcon = mysqli_connect($hostname_dbcon, $username_dbcon, $password_dbcon) or trigger_error(mysqli_error(), E_USER_ERROR); 
?>

Answer 1

Correct params order is $connection, $db_name:

mysqli_select_db($dbcon, $database_dbcon);

Answer 2

Passing wrong parameters. The first parameter is the connection object & the second parameter is the database name.

mysqli_select_db($dbcon, "Datebase Name");

Do the same for mysqli_query()

mysqli_query($dbcon, $query_slide);

Answer 3

You have placed arguments to mysqli_select_db() incorrectly.

Corrected one is:

mysqli_select_db($dbcon, $database_dbcon);

Reference: http://php.net/manual/en/mysqli.select-db.php

Answer 4

Correct params over both function

mysqli_select_db($database_dbcon, $dbcon);

should be

mysqli_select_db($dbcon,$database_dbcon);

and another

mysqli_query($query_slide , $dbcon)

should be

mysqli_query($dbcon, $query_slide)