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Gist for my tutorial "Building a Gutenberg sidebar plugin Part 1: Registering the plugin with (oop) php". https://vanaf1979.nl/making-a-gutenberg-sidebar-plugin-part-1-registering-the-plugin-with-oop-php/
<?php
class MetaTags {
...
public static function instance() {
if ( ! isset( self::$instance ) && ! ( self::$instance instanceof MetaTags ) ) {
self::$instance = new Self();
}
return self::$instance;
}
}
?>
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