Why Am I Getting the \'Fatal error: Call to a member function prepare() on null\' Error in My PHP Code?

"Fatal error: Call to a member function prepare() on null"

In your code, you are encountering the "Fatal error: Call to a member function prepare() on null" issue while trying to fetch data from the database using the Category class. This error indicates that the $pdo object is not initialized.

To resolve this issue, ensure that you create a new PDO object and assign it to the $pdo variable in the global scope before calling the methods within the Category class. Since you declared the methods in the class using the global $pdo variable, it needs to be initialized in the global scope.

Here's how you can initialize the $pdo object:

<code class="php">$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');</code>

Make sure to replace 'localhost', 'test', 'username', and 'password' with the appropriate values for your database configuration.

Once you have initialized the $pdo object, you should be able to use the Category class methods to fetch data from the database without encountering the "Fatal error: Call to a member function prepare() on null" issue.

Note that the provided code snippet does not handle potential errors in connecting to the database. It is recommended to include error handling code and potentially display an error message to the user if the connection fails.

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