How to Insert PHP Code into WordPress Posts and Pages - GreenGeeks
insert-php-code-snippet/insert-php-code-snippet.php at master · wp-plugins/ insert-php-code-snippet · GitHub
GitHub - WPPlugins/insert-php-code-snippet: This is a mirror of the svn repo: https://plugins.svn.wordpress.org/insert-php-code-snippet/, the master is always the latest release.