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I'm setting up a Wordpress Network and wanted all new sites to have the same permalink structure (i.e. "/%year%/%monthnum%/%postname%/"). I'm wondering if this is possible to do via hooks or hacks in functions.php, without having to rely on users to choose that structure.

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3 Answers 3

Reset to default
16

You can set the permalink structure by calling on the set_permalink_structure() method of the global $wp_rewrite object.

add_action( 'init', function() {
    global $wp_rewrite;
    $wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
} );

Here's a PHP < 5.3 version of the code in case you're getting errors.

function reset_permalinks() {
    global $wp_rewrite;
    $wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
}
add_action( 'init', 'reset_permalinks' );
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8
  • Copying and pasting your code generates an error, but the rationale does the trick! I only wonder if my question / intentions are good practice, though...
    – Tomas Buteler
    Commented Oct 16, 2011 at 21:26
  • 1
    Tomas, thanks for accepting the answer. Glad to have been of help. As for good practices - I think that if your objective is to enforce and lock such a permalink structure across websites - then that's justifiable; and by 'lock' I mean that code will not allow any changes to the structure via the Admin, if that's fine then I reckon it's totally okay to do this.
    – soulseekah
    Commented Oct 17, 2011 at 4:41
  • 1
    It works but it cause a conflict when admin saves from permalink page (404 on posts). Then when the site loades (proccess init hook) the permalink structure changes again (404 on posts again). using $wp_rewrite->flush_rules(); solves the problem. Bad practice to use it on init and run it every time. Just visiting the permalinks page will do the tricks.
    – Sisir
    Commented Apr 28, 2012 at 11:16
  • 1
    The whole intention was to disable the permalinks options page, so maybe I can get away with it?
    – Tomas Buteler
    Commented Apr 28, 2012 at 15:08
  • 3
    It should be called on 'after_switch_theme' or on plugin activation and be followed by 'flush_rewrite_rules()'
    – csstd
    Commented Oct 27, 2013 at 4:27
2

Previous Answer is not working. I have gotten a pure solution. Can use Use this code. It will work 100%. Thanks

/**
 * Rewrite set up, when theme activate i mean
 */
if (isset($_GET['activated']) && is_admin()) {
    global $wp_rewrite;
    $wp_rewrite->set_permalink_structure('/%postname%/');
    $wp_rewrite->flush_rules();
}

/**
* Redirect to Permalink setting Page.
* Otherwise Redirect rule will not work Properly.
*/
function redirect_to_permalink() {

    wp_redirect('options-permalink.php');
}
add_action( 'after_switch_theme', 'redirect_to_permalink' );
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0 
function setPermaLink(){
    $ps = '/%category%/%postname%/';
    $permalink_structure = sanitize_option( 'permalink_structure', $ps);
    $blog_prefix = '/blog';
    $prefix = '/index.php';

    if ( ! empty( $permalink_structure ) ) {
        $permalink_structure = preg_replace( '#/+#', '/', '/' . str_replace( '#', '', $permalink_structure ) );
        if ( $prefix && $blog_prefix ) {
            $permalink_structure = $prefix . preg_replace( '#^/?index\.php#', '', $permalink_structure );
        } else {
            $permalink_structure = $blog_prefix . $permalink_structure;
        }
    }

    $wp_rewrite->set_permalink_structure( $permalink_structure );
    flush_rewrite_rules();
}

setPermaLink();
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