Easier And Better Solutions To Get Pictures On Your Posts

WordPress makes it pretty easy to upload picture on posts and pages. Thereby are various data stored, which can be used.
Again and again, you can read tutorials on how to bring photos to posts, normally this is a solution via the custom fields. But there is a different and simpler solution, I think. The maintenance of custom fields is not always necessary.
Therefore, I would like to show some solutions that are, in my opinion, much better and can be expanded in many ways.

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WordPress Database Functions

The WordPress database class is quite extensive and provides a range of methods to work effectively with the database and thereby use the WordPress standard.

You can find the class in /wp-includes/wp-db.php where the individual methods are documented.
I show the most important ones and give some small examples. It is important to work with these opportunities to ensure the safety of Plugins.

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Add File Types for Mediathek

In WordPress 2.8.5 the whitelist of allowed MIME types for downloads will be valid for administrators the first time. This is a step towards security and you can, with the help of a constant, upload all data types.
define ( 'ALLOW_UNFILTERED_UPLOADS', true);

Who has implemented several projects already with WordPress probably had experienced that a user doesn't have the rights to upload a specific format.

The Plugin Role Manager allows the uploading of all MIME types. But in my opinion this is not the perfect way, and therefore here is a small code snippet that takes adjusting according to the particular requirement.
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Check If Required Plugin Is Active

It might be, that your own written Plugin requires another stand alone Plugin to be active. For example if you like to offer a version with enhanced functionality of a Plugin. There are certainly a variety of usage and the implementation is not difficult.

For the implementation, we need the active Plugins, which are found in the database, table options, the active_plugins. Afterwards, I will simply look in the array, which contains the active Plugins, whether the required plugin included and active or not:

$plugins = get_option('active_plugins');
$required_plugin = 'debug_queries/debug_queries.php';
$debug_queries_on = FALSE;
if ( in_array( $required_plugin , $plugins ) ) {
	$debug_queries_on = TRUE; // Example for yes, it's active
}