Using WordPress ‘is_allowed_http_origin()’ PHP function
The `is_allowed_http_origin()` function in WordPress checks whether the HTTP origin is an authorized one
HTTPS
Using WordPress ‘is_home()’ PHP function
Determines whether the query is for the blog homepage.
Using WordPress ‘is_header_video_active()’ PHP function
Checks whether the custom header video is eligible to show on the current page.
Using WordPress ‘is_gd_image()’ PHP function
Determines whether the value is an acceptable type for GD image functions.
Using WordPress ‘is_front_page()’ PHP function
Determines whether the query is for the front page of the site.
Using WordPress ‘is_customize_preview()’ PHP function
Whether the site is being previewed in the Customizer.
Using WordPress ‘is_day()’ PHP function
Determines whether the query is for an existing day archive.
Using WordPress ‘is_favicon()’ PHP function
The `is_favicon()` function in WordPress checks whether the current request is for the favicon
Using WordPress ‘is_date()’ PHP function
Determines whether the query is for an existing date archive.