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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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1 Answer

up vote 7 down vote accepted

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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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... –  tbuteler Oct 16 '11 at 21:26
I assume you're running PHP < 5.3, where closures (anonymous functions) were not available, so I've edited my answer to include the old school way. I tested both code in my theme's functions.php, so let me know if this works.Another thing I noticed is that I typed %year& instead of %year%, so fixed that too. –  soulseekah Oct 17 '11 at 2:01
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 Oct 17 '11 at 4:41
I am running 5.2.17, so that explains it! Second version works out of the box :) Thank you! –  tbuteler Oct 17 '11 at 23:21
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 Apr 28 '12 at 11:16
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