Using WordPress ‘is_post_type_archive()’ PHP function
Determines whether the query is for an existing post type archive page.
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Using WordPress ‘is_paged()’ PHP function
Determines whether the query is for a paged result and not for the first page.
Using WordPress ‘is_network_only_plugin()’ PHP function
Checks for “Network: true” in the plugin header to see if this should be activated only as a network wide plugin. The plugin would also work when Multisite is not…
Using WordPress ‘like_escape()’ PHP function
Formerly used to escape strings before searching the DB. It was poorly documented and never worked as described.