As good as it is, I found that I still needed a bit more flexibility to use it in my projects so I went ahead and made a few small improvements that others might find useful. These give you the option to make your query even more specific, you can:

1. Select whether you want to retrieve only posts or pages.
2. Pass a number ( or many numbers ) to select posts only from specific categories.
3. Limit the number of posts you want to retrieve.

Usage Example

The usage of the function is really simple, as stated before Jamie made an excellent explanation on his blog, so no need to repeat all of that here again. The three new values I added can be assigned easily when calling the function as you can find in the example bellow:

<?php

/*
Function variables:

$aMetaDataList(array) example: array('meta_key' => 'meta_value','meta_key_2' => 'meta_value_2 )
$szType(string) = "post" or "page"
$szCategory(string) = example: '1' or '1,2,3'
$iLimit(integer)
*/

$aMetaDataList = array(
'custom_field_name_1' => 'Yes',
'custom_field_name_2' =>'No',
// etc…
);

$szCategory = '3'; // posts only from category 3
$iLimit = 6; // get only 6 posts

$my_posts = get_post_meta_multiple( $aMetaDataList, 'post', $szCategory, $iLimit );

// Once you have the posts just loop trough them as you would do usually

if ($my_posts):
foreach( $my_posts as $post ):

setup_postdata($post);

the_title();

endforeach;
endif;

?>

As you can see its very easy to use and it gives us developers huge flexibility to create amazing stuff. Props to Jamie for his great work. Hope you found this useful, if you have any suggestions please feel free to leave it on the comments, thank you!

The Function

<?php
function get_post_meta_multiple( $aMetaDataList = array(), $szType = 'post', $szCategory = NULL, $iLimit = NULL )
{
global $wpdb;

$szQuerystr = "SELECT p.* FROM $wpdb->posts AS p";

if ( $szCategory != NULL AND is_string($szCategory) )
{
$szQuerystr .= " LEFT JOIN $wpdb->term_relationships ON (p.ID = $wpdb->term_relationships.object_id) ";
$szQuerystr .= " LEFT JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id) ";
}

$szQuerystr .=  "WHERE p.ID IN ( ";

$szQuerystr .= "SELECT post_id FROM $wpdb->postmeta WHERE ";

$aInnerqry = array();

foreach($aMetaDataList as $szKey => $szValue)
{
$aInnerqry[] = $wpdb->prepare( "(meta_key = %s AND meta_value = %s)", $szKey, $szValue );
}

$szQuerystr .= implode(" OR ", $aInnerqry);

$szQuerystr .= " GROUP BY post_id ";
$szQuerystr .= "HAVING count(*) = " . count($aMetaDataList);

$szQuerystr .= ") AND p.post_status = 'publish' AND p.post_type = '".$szType."'";

if ( $szCategory != NULL AND is_string($szCategory) )
$szQuerystr .= " AND $wpdb->term_taxonomy.term_id IN(".$szCategory.")";

$szQuerystr .= " ORDER BY p.post_title ASC";

if ( $iLimit != NULL AND is_int($iLimit) )
$szQuerystr .= " LIMIT ".$iLimit;

$aMetaResults = $wpdb->get_results($szQuerystr, OBJECT);

return $aMetaResults;
}
?>

This is a post from: Matt Varone

Query Post And Pages With Multiple Meta Values

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Installation

1. Download “Dynamic To Top” from the link above and unzip the files somewhere on your computer.
2. Upload “dynamic-to-top” folder into your plugins directory.
3. Activate the plugin.
4. Have fun!

* Big thanks to Rémy Tourbiez for his contribution to the code.

This is a post from: Matt Varone

Dynamic To Top WordPress Plugin

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After some research on the subject I found htmLawed, a PHP code to purify and filter HTML that works incredibly well. Props to the htmLawed team for their awesome work!. To merge it with WordPress I wrote a little function which automatically filters the content coming from the post. The results are amazing, htmLawed cleans and filters all the bad content and makes the pages validate again right away!

	include_once ( TEMPLATEPATH . '/htmLawed.php' ); // THIS FILE SHOULD RESIDE IN THE THEME FOLDER.

	function clean_the_content( $content )
	{
		$szPostContent = $content;
		$szRemoveFilter = array( "~<p[^>]*>\s?</p>~", "~<a[^>]*>\s?</a>~", "~<font[^>]*>~", "~<\/font>~", "~<span[^>]*>\s?</span>~" );
		$szPostContent = preg_replace( $szRemoveFilter, '' , $szPostContent);
		$szPostContent = htmLawed($szPostContent);
		return $szPostContent;
	}

	add_filter('the_content', 'clean_the_content');

To use this function simple drop the two files in your theme directory and you are set to go!. Hope you find this post useful. Cheers!

This is a post from: Matt Varone

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function is_subpage( $iID = null )
	{
		global $post, $wpdb;

		if ( is_page() AND isset( $post->post_parent ) != 0 )
		{
			$aParent = $wpdb->get_row( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID = %d AND post_type = 'page' LIMIT 1", $post->post_parent ) );

			if ( is_int( $iID ) > 0 )
				if ( $aParent->ID == $iID ) return true; else return false;
			else
				if ( $aParent->ID )	return true; else return false;

		}
		else
		{
			return false;
		}
	}

/* EXAMPLE */

if ( is_page('producs') OR is_subpage( 8 ) )
{
  //do something
};

Cheers!

This is a post from: Matt Varone

Custom WordPress function to check page parent

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— Quick conditional function for WordPress to check if the current page is a sub page. It works both inside and outside the main loop, only for 2.5 and upwards.

Example

Same way as you use is_page, is_home, etc.

<?php if (have_posts()) : ?>

	<?php while (have_posts()) : the_post(); ?>

		<?php if ( is_subpage() ): ?>
			<p> This is a subpage </p>
		<?php endif ?>

	<?php endwhile; ?>

The Function

function is_subpage()
{
	global $post, $wpdb;

	if ( is_page() AND isset( $post->post_parent ) != 0 )
	{
		$aParent = $wpdb->get_row( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID = %d AND post_type = 'page' LIMIT 1", $post->post_parent ) );
		if ( $aParent->ID ) return true; else return false;
	}
	else
	{
		return false;
	}
}

Im not sure why WordPress didn’t include a function like this by default, i hope you find it useful.
Cheers!

This is a post from: Matt Varone

is_subpage() – Custom Conditional Function

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Why you should control search engines

It’s very important to know what and how you want search engines to index your site, if you don’t take the time to do it you are relying on them to “figure it out” for you, and that is not good. In a default WordPress installation you get different instances of your content repeated trough the site. For example take a post. It will appear in the homepage, in it’s single version, listed under a category, in the author pages, in search result, etc. Are you comfortable having duplicated content indexed and letting Search Engines pick/guess which version of it is the one you consider the most relevant? I bet you wont. Thats why it’s good to take this into consideration.

What to index

There’s a lot of dicussion around the web of what you should and shouldn’t index. Unfortunately for us there isn’t one solution that will fit perfectly for all sites, to achieve the best results it will usually require planning ahead and even doing some experimenting and tweaking on the road. The type of content, the blog structure even the theme structure and its elements are things that affects these plans and should be taken into consideration prior making a decision. For example, not all themes will always show duplicate content. If your theme category pages show excerpts of the content that you previously took the time to write, then it certainly is good to index that page. Same thing could happen with tags, author and archives pages as well. If those provide different or extra content then why would you not index them.

How can you control this?

Create a robots.txt file

Im sure most of you know what a robots.txt file is for. For those who don’t know, it’s basically a file that goes in the root folder of your site with instructions of what specific files or directories you want to allow or disallow Search Engines to index. Here is a sample of a WordPress robots.txt file:

User-agent: *
Disallow: /tag
Disallow: /author

To prevent duplicated content, in the sample above I decided to disallow the indexing of everything under /tag and /author. Remember not all themes/sites should have these same instructions, you have to choose carefully what you’ll want to remove. As a live example you can see my robots.txt file. If you feel uncomfortable editing files in your server there’s a nice plugin to create this file from within the Admin panel.

Add the correct robots meta tags to your theme pages

If you feel you want to have a more specific control, or if you don’t trust enough your robots.txt file, you can always opt to use the robots meta tag. You can use this tag to tell Search Engines not to index the content of a page, and/or not scan it for links to follow. Joost de Valk has put together a great plugin to handle this easily from within WordPress control panel.

Conclusion

Your site might had been loosing relevance in search results because of this so I encourage you to think about it and give it the time it deserves. If you have any tip or suggestion feel free to add it in the comments.

Hope you enjoyed,
Thanks!

This is a post from: Matt Varone

WordPress SEO: Control Search Engines

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