Allow wp_no_robots to be hooked

[tomdxw]

It was decided in #22876 that

<meta name='robots' content='noindex,nofollow' />

would be replaced with

<meta name='robots' content='noindex,follow' />

But for those who would prefer noindex,nofollow there's no way to change it without a lot of hassle.

A change as simple as this would make it very flexible:

function wp_no_robots() {
        echo apply_filters('wp_no_robots', "<meta name='robots' content='noindex,follow' />\n");
}

[peterwilsoncc]

This was discussed in a triage session today, it may have changed since this ticket was opened but it is now possible to unhook the wp_no_robots function.

The following code will remove it and similar code to that above can be used to hook on to wp_head.

<?php
remove_action( 'wp_head', 'wp_no_robots' );

It's also worth noting that for private blogs, for example those with search engine indexing disabled, the default meta tag content was changed to nofollow

[SergeyBiryukov]

Replying to peterwilsoncc:

it may have changed since this ticket was opened but it is now possible to unhook the wp_no_robots function.

Just to clarify, that was always the case since its introduction in [19304].