Using WordPress ‘is_login()’ PHP function
Determines whether the current request is for the login screen.
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Using WordPress ‘is_locale_switched()’ PHP function
Is_locale_switched() is a useful WordPress function that allows you to check whether the locale has been switched or not
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 ‘is_active_sidebar()’ PHP function
The `is_active_sidebar()` function in WordPress checks if a sidebar contains widgets and returns true if it does, allowing you to conditionally display its contents
Using WordPress ‘is_404()’ PHP function
Determines whether the query has resulted in a 404 (returns no results).
Using WordPress ‘iso8601_to_datetime()’ PHP function
Given an ISO 8601 (Ymd H:i:sO) date, returns a MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].
Using WordPress ‘in_the_loop()’ PHP function
The article "Using WordPress `in_the_loop()` PHP Function" explains how to use the `in_the_loop()` function in WordPress, including its parameters and examples of usage such as modifying single post entry titles,…
Using WordPress ‘iso8601_timezone_to_offset()’ PHP function
Given an ISO 8601 timezone, returns its UTC offset in seconds.
Using WordPress ‘in_category()’ PHP function
Checks if the current post is within any of the given categories.