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SEO Enforcer is a small plugin that works with WordPress SEO by Yoast (it’s required), that will truncate your title tag if it’s too long, same with your meta description tag. The length they are truncated at is a setting you can configure.
There is also an option to remove H1 tags from your content. Typically your theme will show the H1 tag for your post or page title already. Having more than one H1 tag is not recommended for SEO, so this will remove any it finds in your content and replace them with an H2 tag instead.
Plugin Requirements
<ul>
<li>WordPress SEO by Yoast v1.6.1+</li>
</ul>
Note: It may work on earlier versions of those plugins but it has not been tested.

SEO Enforcer

Ensures that your title tag and meta description tag aren't too long and truncates them if they are. Requires WordPress SEO by Yoast.

WPGurus

This tiny plugin allows you to use spintax like <code>{phrase 1|phrase 2|phrase 3}</code> in your posts, pages and theme files. Just enclose the content that you want to be processed in the shortcode [wpts_spin][/wpts_spin] and a unique copy will be generated on each page load. Alternatively, you can pass the spintax string to the function <code>wpts_spin()</code> and echo the returned value.
The plugin can help you avoid duplicate content penalties. For instance if you have a sizable block of text that needs to appear throughout the website then you can write spintax for it and use the above-mentioned shortcode or template tag to generate unique copies.
Nested spintax like <code>{phrase 1|phrase 2|{sub-phrase 1|sub-phrase 2|sub-phrase 3}}</code> is also supported by the plugin.
Example 1:
Shortcode:
<pre><code>[wpts_spin]{phrase 1|phrase 2|phrase 3}[/wpts_spin]
</code></pre>
Function:
<pre><code><?php wpts_spin('{phrase 1|phrase 2|phrase 3}'); ?>
</code></pre>
Sample Output:
<ul>
<li>phrase 1</li>
<li>phrase 2</li>
<li>phrase 3</li>
</ul>
Example 2 (Nested Spintax):
Shortcode:
<pre><code>[wpts_spin]{phrase 1|phrase 2|{sub-phrase 1|sub-phrase 2|sub-phrase 3}}[/wpts_spin]
</code></pre>
Function:
<pre><code><?php wpts_spin( '{phrase 1|phrase 2|{sub-phrase 1|sub-phrase 2|sub-phrase 3}}' ); ?>
</code></pre>
Sample Output:
<ul>
<li>phrase 1</li>
<li>sub-phrase 2</li>
</ul>
Example 3 (Caching):
Shortcode:
<pre><code>[wpts_spin cache="604800"]{phrase 1|phrase 2|phrase 3}[/wpts_spin]
</code></pre>
Function:
<pre><code><?php wpts_spin( '{phrase 1|phrase 2|phrase 3}', array( 'cache' => '604800' ) ); ?>
</code></pre>
Sample Output:
Same as Example 1 but the output will be cached for a week (604800 seconds).

Text Spinner

Allows you to use spintax in your posts, pages and theme files

SEO Enforcer vs Text Spinner