Comments Link Optimization waht prevent all search engine crawl your comments link.
PHP
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readme.txt

readme.txt

=== Comments Link Optimization ===
Contributors: lite3
Donate link: https://me.alipay.com/lite3
Tags: comments, seo, links
Requires at least: 3.0.0
Tested up to: 4.4
Stable tag: 1.8.3.2

Comments Link Optimization waht prevent all search engine crawl your comments link. 

== Description ==

Comments Link Optimization waht prevent all search engine crawl your comments link. 

Comments Link Optimization will modify link below.

* Comments author link.
* Comments content link.

Comment Optimize URL will not modify link below.

* Visitors reply link. (@user)

Related Links:

* <a href="http://www.litefeel.com/comments-link-optimization/" title="Comments Link Optimization Plugin for WordPress">Plugin Homepage</a>
* <a href="http://www.litefeel.com/" title="Author For Comments Link Optimization Plugin">Author Homepage</a>
* <a href="https://github.com/lite3/comments-link-optimization" title="On GitHub">On GitHub</a>

== Installation ==

You can find, download and install Comments Link Optimization directly from the **Plugins** section in WordPress.

If you want to install manually, download and unzip the `comments-link-optimization.zip` file and upload to the `/wp-content/plugins/comments-link-optimization/` directory. Then activate the plugin through the **Plugins** section in WordPress.

== Frequently Asked Questions ==

= Do I need to create or modify the robots.txt file? =

No. The robots.txt file is automatically created and modified, and does not modify existing content.

= Do I need to modify the php file? =

No. After you install and activate the plugin needs to do nothing.

= How can add rel="nofollow" to comments link? =

You do not need to add nofollow to comments link, Because the plug-in by modifying the robots.txt file to prevent search engines crawling the comment link from your site. Robots.txt takes precedence over the nofollow.

== Changelog ==
= 1.8.3.2 =
* Tested up to: 4.4
= 1.8.3.1 =
* Tested up to: 4.0
= 1.8.3 =
* Tested up to: 3.9.1
= 1.8.2 =
* Compatibility check for 3.6, nothing new, just bump version to tell everyone this plugin still works.
= 1.8 =
* Modify: At the redirect page, 3 seconds after automatically jump to the target address.
= 1.7 =
* Added: Add redirect page.
= 1.6 =
* Fixed: The file 'robots.txt' does not exist will display a warning.
= 1.5 =
* Fixed: Self site link has been modified.
= 1.4 =
* Fixed: Comment author links in the Administration Panel has been modified.
= 1.3 =
* Fixed: Some themes not modify comment author link.
= 1.2 =
* Fixed: Redirect bug.
= 1.1 =
* Changed: The readme.txt file.
= 1.0 =
* Initial public release.