=== Linkify Posts ===
Contributors: coffee2code
Donate link: http://coffee2code.com/donate
Tags: post, id, link, template, coffee2code
Requires at least: 2.8
Tested up to: 3.0.1
Stable tag: 2.0
Version: 2.0

Turn a string, list, or array of post IDs and/or slugs into a list of links to those posts.


== Description ==

Turn a string, list, or array of post IDs and/or slugs into a list of links to those posts.

Particularly handy when used in conjunction with the post custom field feature of WordPress.  You could define a custom field for "Related Posts" or "Additional Products" and manually list out post IDs, then utilize the function provided by this plugin to display links to those posts in a custom manner.


== Installation ==

1. Unzip `linkify-posts.zip` inside the `/wp-content/plugins/` directory for your site (or install via the built-in WordPress plugin installer)
1. Activate the plugin through the 'Plugins' admin menu in WordPress
1. Insert function call(s) to your templates to display links to posts when post IDs are known


== Template Tags ==

The plugin provides one template tag for use in your theme templates.

= Functions =

* `<?php c2c_linkify_posts($posts, $before = '', $after = '', $between = ', ', $before_last = '', $none = '') ?>`
Displays links to each of any number of posts specified via post IDs

= Arguments =

* `$posts`
A single post ID/slug, or multiple post IDs/slugs defined via an array, or multiple posts IDs/slugs defined via a comma-separated and/or space-separated string

* `$before`
(optional) To appear before the entire post listing (if posts exist or if 'none' setting is specified)

* `$after`
(optional) To appear after the entire post listing (if posts exist or if 'none' setting is specified)

* `$between`
(optional) To appear between all posts

* `$before_last`
(optional) To appear between the second-to-last and last element, if not specified, 'between' value is used	

* `$none`
(optional) To appear when no posts have been found.  If blank, then the entire function doesn't display anything

= Examples =

* These are all valid calls:

`<?php c2c_linkify_posts(43); ?>`
`<?php c2c_linkify_posts("43"); ?>`
`<?php c2c_linkify_posts("hello-world"); ?>`
`<?php c2c_linkify_posts("43 92 102"); ?>`
`<?php c2c_linkify_posts("hello-world whats-cooking"); ?>`
`<?php c2c_linkify_posts("43,92,102"); ?>`
`<?php c2c_linkify_posts("hello-world, whats-cooking"); ?>`
`<?php c2c_linkify_posts("43, 92, 102"); ?>`
`<?php c2c_linkify_posts("hello-world, 92, whats-cooking"); ?>`
`<?php c2c_linkify_posts(array(43,92,102)); ?>`
`<?php c2c_linkify_posts(array("hello-world", "whats-cooking")); ?>`
`<?php c2c_linkify_posts(array("43","92","102")); ?>`

* `<?php c2c_linkify_posts("43 92"); ?>`

Outputs something like:

`<a href="http://yourblog.com/archive/2008/01/15/some-post">Some Post</a>,
<a href="http://yourblog.com/archive/2008/01/15/another-post">Another Post</a>`

* Assume that you have a custom field with a key of "Related Posts" that happens to have a value of "43 92" defined (and you're in-the-loop).

`<?php c2c_linkify_posts(get_post_meta($post->ID, 'Related Posts', true), "Related posts: "); ?>`

Outputs something like:

`Related posts: <a href="http://yourblog.com/archive/2008/01/15/some-post">Some Post</a>,
<a href="http://yourblog.com/archive/2008/01/15/another-post">Another Post</a>`

* `<ul><?php c2c_linkify_posts("43, 92", "<li>", "</li>", "</li><li>"); ?></ul>`

Outputs something like:

`<ul><li><a href="http://yourblog.com/archive/2008/01/15/some-post">Some Post</a></li>
<li><a href="http://yourblog.com/archive/2008/01/15/another-post">Another Post</a></li></ul>`

* `<?php c2c_linkify_posts(""); // Assume you passed an empty string as the first value ?>`

Displays nothing.

* `<?php c2c_linkify_posts("", "", "", "", "", "No posts found."); // Assume you passed an empty string as the first value ?>`

Outputs:

`No posts found.`


== Filters ==

The plugin exposes one action for hooking.

= c2c_linkify_posts (action) =

The 'c2c_linkify_posts' hook allows you to use an alternative approach to safely invoke `c2c_linkify_posts()` in such a way that if the plugin were to be deactivated or deleted, then your calls to the function won't cause errors in your site.

Arguments:

* same as for `c2c_linkify_posts()`

Example:

Instead of:

`<?php c2c_linkify_posts( "112, 176", 'Posts: ' ); ?>`

Do:

`<?php do_action( 'c2c_linkify_posts', "112, 176", 'Posts: ' ); ?>`


== Changelog ==

= 2.0 =
* Rename plugin from 'Linkify Post IDs' to 'Linkify Posts'
* Rename `linkify_post_ids()` to `c2c_linkify_posts()` (but maintain a deprecated version for backwards compatibility)
* Rename 'linkify_post_ids' filter to 'c2c_linkify_posts' (no backwards compatibility support since v1.5 was never released)
* Allow linkifying posts specified by slug (in addition to existing support for posts specified by ID)
* Change description
* Drop support for version of WP older than 2.8

= 1.5 =
* Add filter 'linkify_post_ids' to respond to the function of the same name so that users can use the do_action() notation for invoking template tags
* Fix to prevent PHP notice
* Wrap function in if(!function_exists()) check
* Reverse order of implode() arguments
* Remove docs from top of plugin file (all that and more are in readme.txt)
* Add package info to top of plugin file
* Add PHPDoc documentation
* Note compatibility with WP 2.8+, 2.9+, 3.0+
* Minor tweaks to code formatting (spacing)
* Add Changelog, Filters, and Upgrade Notice sections to readme.txt
* Update copyright date
* Remove trailing whitespace

= 1.0 =
* Initial release


== Upgrade Notice ==

= 2.0 =
Significant update. Highlights: renamed plugin; renamed `linkify_post_ids()` to `c2c_linkify_posts()`; allow specifying post slug as well as ID; dropped compatibility with versions of WP older than 2.8.

= 1.5 =
Minor update. Highlights: added filter to allow alternative safe invocation of function; verified WP 3.0 compatibility.