Runtime Error

What This Error Means

This error occurs when trying to use an object that has not been initialized or has been set to null, in this case, a PDO object.

Why It Happens

The PDO object is not properly instantiated or is set to null due to a previous error or incorrect configuration.

How to Fix It

1. 1To fix this error, ensure that the PDO object is properly initialized and configured. This can be done by checking the database connection settings and verifying that the PDO object is not set to null. Here's an example of how to fix this error:
2. 2// Before (broken code)
3. 3$db = null;
4. 4$stmt = $db->prepare('SELECT * FROM users');
5. 5// After (fixed code)
6. 6$db = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
7. 7$stmt = $db->prepare('SELECT * FROM users');

Example Code Solution

database.php: $db = null;
$stmt = $db->prepare('SELECT * FROM users');

database.php: $db = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
$stmt = $db->prepare('SELECT * FROM users');