Php – Notice: Use of undefined constant DB_HOST – assumed ‘DB_HOST’ in C:\xampp\htdocs\blog\system\functions.php on line 31

PHP

Getting a couple of errors and can't for the life of me see where I am falling down. Below is the functions file

<?php
include('config.php');

function getAllPosts()
{
    try {
        $dbh = new PDO(DB_HOST, DB_USER, DB_PASS);
    } catch (PDOException $e) {
        echo $e->getMessage();
    }

    $stmt = $dbh->prepare('SELECT id, title, content FROM posts ORDER BY created_at DESC');
    $stmt->execute();
    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    return $results;
}

function getSinglePost($id)
{
    try {
        $dbh = new PDO(DB_HOST, DB_USER, DB_PASS);
    } catch (PDOException $e) {
        echo $e->getMessage();
    }
    $stmt = $dbh->prepare('SELECT title, content FROM posts WHERE id = ?');
    $bindings = array($id);
    $stmt->execute($bindings);
    $result = $stmt->fetch(PDO::FETCH_ASSOC);
    return $result;
}

?>

Also figured I should include the page that I am running to generate the error

<?php include('system/functions.php'); ?>
<html>
<head>
<title>Create A New Post | My First Blog</title>

<link rel="stylesheet" type="text/css" href="style.css">

</head>

<body>
<div id="form">
<?php if (isset($_GET['id'])){ ?>

<h2>Single Post:</h2>

<?php $post = getSinglePost($_GET['id']); ?>
<?php print_r($post); ?>

<?php } ?>
<fieldset>
</fieldset>
</div>

</body>
</html>

Any help much appreciated these are the errors in full.

Notice: Use of undefined constant DB_HOST – assumed 'DB_HOST' in C:\xampp\htdocs\blog\system\functions.php on line 31

Notice: Use of undefined constant DB_USER – assumed 'DB_USER' in C:\xampp\htdocs\blog\system\functions.php on line 31

Notice: Use of undefined constant DB_PASS – assumed 'DB_PASS' in C:\xampp\htdocs\blog\system\functions.php on line 31
invalid data source name
Notice: Undefined variable: dbh in C:\xampp\htdocs\blog\system\functions.php on line 37

Fatal error: Call to a member function prepare() on a non-object in C:\xampp\htdocs\blog\system\functions.php on line 37

Should include config file too

<?php
define('DB_HOST','mysql:host=localhost;dbname=blog');
define('DB_USER','root');
define('DB_PASS','');
?>

Best Answer

The constants you are using for Host, User and Password haven't been defined yet. There's probably something wrong with your config.php.

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