This plugin is outdated and might not be supported anymore
Custom Fields as Meta Tags

Custom Fields as Meta Tags

Details
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Add custom fields of any post as meta tag in head section of that post. It is useful for SEO purposes when you want to add any data as meta tags in head section of that post. You don’t need any sophisticated plugin or learn coding to add meta tags for your keywords. Just add custom fields in your post and this plugin will automatically add those custom fields as meta tags in your post header.

Details

Plugin code:
custom-fields-as-meta-tags
Plugin version:
0.1
Outdated:
Yes
WP version:
3.0.1 or higher
PHP version:
or higher
Test up to WP version:
4.0.38
Total installations:
10
Last updated:
2014-11-02
Rating:
Times rated:
2
custom
custom-field
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meta
tag