Instantiate class to be available to all plugin functions

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I’m developing a plugin for a site that has to communicate with several non-wp tables in a database. For that I made a class that contains all of the MySQL-related functions.

When you declare a function within a plugin, you can easily call it within a theme. But how to do that with a class?
Is there a way to instantiate it with wordpress init and make it available to plugin(s) and theme(s)?

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Thank you for your time! 🙂

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1 comment

  1. Ryan McCue had a nice idea for his plugin Hopper: add a callback for a custom filter to return the current instance.

    Sample code for the plugin:

    class Plugin_Class {
    public function __construct()
    {
        add_filter( 'get_plugin_class', array ( $this, 'provide_instance' ) );
    }

    function provide_instance() {
        return $this;
    }
}

    In a theme or a second plugin you can access the instance now like this:

    $plugin_class = apply_filters( 'get_plugin_class', NULL );

if ( is_a( $plugin_class, 'Plugin_Class' ) )
{
    // use the plugin class instance
}

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