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Editorial Team
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Asked: 2026-05-24T12:18:10+00:00

i am building a plugin for wordpress. At first, i was accounting with the

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i am building a plugin for wordpress. At first, i was accounting with the default settings, where the URL of a post would be http://localhost/worpress/?p=123, and I was asking for is_single() in the wp_footer action.

When my plugin was ready, i went to try to cleanup my code. There are (at least) two things that i’m getting wrong:

  1. Why does it return false, when i ask for is_single() in the init action or something sooner than wp_footer?
  2. Why, when i try a var_dump($_REQUEST) (or _POST, or _GET) anywhere in my page cycle, i get an empty array, after switching the permalink options to url_friendly type?

Can anyone shed a light on this, please?

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1 Answer

  1. Editorial Team

    Question 1:

    • is_single() will only return true if you are on a single post
    • the init action hook occurs really early in the cycle; if you call is_single before the WP_Query is instantiated you’ll get false.

    To figure out whether you’re calling is_single too early set define('WP_DEBUG', true); in wp-config.php. This is on line 81 of my version of wp-config. You will see an error message from WordPress if you’re calling it too early. (Plus it’s a good tool to use during development.)

    Question 2:

    You’re not getting $_REQUEST parameters after switching to friendly URL’s because friendly URLs don’t have a querystring (the name/value pairs that occur after the question mark in something like http://localhost/worpress/?p=123.) Note that http://localhost/worpress/foo/bar doesn’t have a question mark.

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