How to Change Author Posts URL

How can I display an authors archive by author id instead author slug like

http://example.com/author/author_slug/

to

http://example.com/author/123/

Answers:

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Method 1

You can accomplish this with the following rewrite rule ( you’ll want to add this in your functions.php

add_rewrite_rule(
    'author/([0-9]+)/?$',
    'index.php?author=$matches[1]',
    'top'
);

Be aware that you might need to flush your rules for it to become active. You can do this with rewrite plugin.

Method 2

after investigation into wp rewrite rules for author and with help of @Mark Davidson everything is now working perfect author archives pagination and feed rss atom etc.

below is the code which i have created and pasted here to help others, Thanks Mark Davidson for providing a pattern.

// add our custom rewrite rules for author archives
add_action('author_rewrite_rules', 'my_author_rewrite_rules');

function my_author_rewrite_rules() {
    $author_rules['author/([0-9]+)/?$'] = 'index.php?author=$matches[1]';
    $author_rules['author/([0-9]+)/page/?([0-9]{1,})/?$'] = 'index.php?author=$matches[1]&paged=$matches[2]';
    $author_rules['author/([0-9]+)/(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?author=$matches[1]&feed=$matches[2]';
    $author_rules['author/([0-9]+)/feed/(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?author=$matches[1]&feed=$matches[2]';
    return $author_rules;
}

this function will totally replace the author rewrite rules, if anyone want to add new rules and don’t want to replace existing then he/she need to supply $author_rules argument in function like.

function my_author_rewrite_rules($author_rules) {
   // new rules here
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0