Using WordPress ‘is_site_meta_supported()’ PHP function
The `is_site_meta_supported()` function in WordPress determines whether site metadata is enabled or not
Plugin
Using WordPress ‘is_plugin_page()’ PHP function
Determines whether the current admin page is generated by a plugin.
Using WordPress ‘is_lighttpd_before_150()’ PHP function
Determines whether the server is running an earlier than 1.5.0 version of lighttpd.
Using WordPress ‘install_plugins_upload()’ PHP function
Learn how to use the WordPress 'install_plugins_upload()' PHP function to display a form for uploading plugins from zipped files