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

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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

WordPress: Output Clean and Valid HTML Content

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Current version: 1.1 3/4/10

— Inspired by the great idea of David Walsh’s jQuery topLink Plugin, I made a similar plugin but with two key differences, this one does not require you to add extra html markup or extra plugins to function. It will only work when JavaScript is turned on ( on purpose ), It’s easy to setup with only one line of code, and it works cross-browser nicely ( Tested: IE6-8, FF, Safari ). Optionally it can benefit from the jQuery Easing plugin with a different easing animation for the page scrolling.

RELEASE NOTES

ver 1.1 – Improvements to configuration conveniences. *
ver 1.0 – First Release.

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

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Current version: 1.1.4 7/31/09

These are a couple of it’s main features ( ver. 1.1.4 ):

* Multiform handler.
* Support for required fields.
* PHP email validation.
* Unobtrusive JavaScript function to pre-check form data ( 4KB file ).
* Lightweight, easy to use.
* Multilingual support.
* External configuration file that can reside outside the public folder.

HOW DOES IT WORKS?

It’s very simple, first there is a configuration file where you define all of your website forms, by this I mean form title, form fields, form required fields and the location of each form. Then there are some snippets you have to add to your form page/s and thats all. SimpleForm takes care of pre-cheking the form fields with JS and then validating them with PHP, if it’s valid then it will send the email to the configured email address and return the user to the form page with a success message or otherwise, with an error message.

INSTALLING THE SCRIPT

These are the necessary steps to have it up and running ( requires PHP 5 ):

1. Download SimpleForm ( ver 1.1.4 )
2. Open sf-config.php and edit the necessary info.
3. Upload sf-config.php to your host ( preferably outside the public folder ).
4. Open simpleform.php and edit the variable $PATH_TO_CONFIG_FILE ( on line 24 ) with the path from simpleform.php to sf-config.php ( leave empty if it resides on the same folder ).
5. Upload simpleform.php, simpleform.css and checkform.mini.js inside your public folder.
6. Open your form page/s and add the necessary code snippets.

EDITING THE CONFIGURATION FILE SF-CONFIG.PHP

# ------------------------------------------------------------ #
// SIMPLEFORM CONFIGURATION								      //
# ------------------------------------------------------------ #

/* GENERAL CONFIGURATION
/////////////////////////////*/

// The name of the website/client. Example: "My Website".
$aSettings["szFrom"] = "";							

// The email address that will receive the emails. Example: "me@myemail.com".
$aSettings["szRecipient"] = "";		

/* The email address that will be used to send the emails. To work properly this has to be a real account
configured on the same server of the site. Example: "noreply@mywebsite.com". */
$aSettings["szFromEmail"] = "";					    

/* FORMS CONFIGURATION
/////////////////////////////*/

/* The next step is to configure the Form/s.
   You can add as many as you want. */

$aForms = array(

	1 => array( 									// FORM ID: 1
		"szFormTitle" => "",						// FORM TITLE - Example: "Contact Form"
		"szFormURL" => "",							// FORM URL ( users will be redirected to this page )
		"szFormRequired" => array(					/* REQUIRED FIELDS ( array of name attributes ) */
			"name",
			"email",
		),
		"aFormFields" => array( 					/* LIST OF FORM FIELDS AND THEIR OUTPUT NAME
 													  All input fields coming from the form should go here.
													  The first value is the name attribute used and the second value
													  on the right the name displayed on the outputed data.

													  Any required field that contains the word "email" will have
													  it"s value validated as an email address. */
		   	"name" => "First Name",
			"email" => "E-mail",
			"work_email" => "Work Email",
			"phone" => "Telephone",
			"-sep1" => "This is a separator",		/* This is a separator. Any variable starting with the sign "-"
														will act as a content separator. */
			"color" => "Color Option",
			"comments" => "Comments",
			"-sep2" => "This is Another separator",
			"newsletter" => "Subscribe to our Newsletter?",
			"interested[]" => "Im interested in",
			/* add more */
			)
	),

	2 => array(										/* Form 2. Same as above */
		"szFormTitle" => "",
		"szFormRequired" => array(),
		"szFormURL" => "",
		"aFormFields" => array(
			/* add more */
			)
	),

	3 => array(										/* Form 3. Same as above */
		"szFormTitle" => "",
		"szFormRequired" => array(),
		"szFormURL" => "",
		"aFormFields" => array(
			/* add more */
			)
		),

	/* add more */
);

/* RESPONSE CONFIGURATION
/////////////////////////////*/

/* Response Messages: These are the variables that hold the messages
the system prints as response. You can modify them to suit your project needs. */

 // Form has been sent.
$aSettings["aMessages"]["szSubmitSucess"]  = "Your message has been sent succesfully. Thanks!";
// Missing fields.
$aSettings["aMessages"]["szMissingFields"] = "Please complete all required fields.";
// Unvalid email address.
$aSettings["aMessages"]["szUnvalidEmail"]  = "Please insert a valid email address.";
// Email not sent by system error.
$aSettings["aMessages"]["szSystemError"]   = "There was an error in the system. Please try again later. Thanks!";

/* ADVANCED CONFIGURATION
/////////////////////////////*/

// Name of the GET variable to pass response messages
define( "GET_NAME", "response");
// Debug mode ( prints email content, and system errors )
define( "DEBUG_MODE" , false );
/* Check if the domain of the submited email addresses exists.
False by default as it may bring problems with some servers. ) */
define( "CHECK_EMAIL_ADDRESS_DNS" , false );

INTEGRATING SIMPLEFORM WITH YOUR FORMS

Below you’ll find the things you need to do to your form page ( must be php file ) for SimpleForm to work. I also have included a full example at bottom.

A. Add Javascript and CSS files

Add simpleform.css and checkform.js ( or checkform.mini.js ) inside the <head> element:

	<link rel="stylesheet" href="simpleform.css" type="text/css" media="screen"/>
	<script type="text/javascript" src="checkform.mini.js"></script>
	

B. Define the path to the config file and Include simpleform.php in the document ( before your form/s ):

	<?php
	define( "CONFIG_PATH", "place/here/the/path/to/sf-congif/dir/" );
	require_once "simpleform.php";
	$sForm = new simpleForm();
	?>
	

C. Add SimpleForm Responses function

Prints the systems response and can reside anywhere on the document.

			<?php
 		   	// Example: <p class="message-box error">Please insert a valid email address.</p>
 		   	$sForm->handleMessage(); ?
 		   	>
		

Output example:

Please insert a valid email address.

D. Add SimpleForm Form function

This function generates the required hidden input fields for simpleForm to work. The value passed is the ID assigned to the current form in the configuration file. This function must reside in between the <form></form> elements.

 <?php
 //Prints necessary data for the form with the ID = 1
$sForm->printData(1);
?>

E. Edit the <form> attributes:

Point the form’s action attribute to simpleform.php and then add the checkform function to enable the js data pre-checking.

	<form action="simpleform.php" method="post" onsubmit="return checkform(this)">

The checkform() function supports an optional string parameter which alters the text you
want to display on the js alerts. The variable #name is provided as a wildcard for the field Name.

Examples:
“Please complete the field #name”
“The field #name is missing”
“Por Favor complete el campo #name”

				onsubmit="return checkform(this,'The field #name is missing')"
				

Full Example

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
		<html xmlns="http://www.w3.org/1999/xhtml">
		<head>
			<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
			<title>SimpleForm Example</title>
			<link rel="stylesheet" href="simpleform.css" type="text/css" media="screen"/>
			<script type="text/javascript" src="checkform.mini.js"></script>
		</head>
		<body>

			<?php
			define( "CONFIG_PATH", "../secure/" );

			require_once "simpleform.php";
			$sForm = new simpleForm();

			$sForm->handleMessage();
			?>

			<form action="simpleform.php" method="post" onsubmit="return checkform(this)">
		 	<fieldset>
		 	<?php $sForm->printData(1); ?>
				<legend>Personal Details:</legend>
		        <label for="name" >Name</label>
		        <input name="name" id="name" type="text" value="" />
		        <label for="email">Email <span class="required">(required)</span></label>
		        <input name="email" id="email" type="text" value="" />
				<label for="work_email">Work Email</label>
		        <input name="work_email" id="work_email" type="text" value="" />
				<label for="phone">Telephone <span class="required">(required)</span></label>
		        <input name="phone" id="phone" type="text" value="" />
		        <label for="color">Color Options: <span class="required">(required)</span></label>
		        <select name="color" id="color">
					<option value="-">Choose a color</option>
					<option value="Red">Red</option>
					<option value="Green">Green</option>
					<option value="Blue">Blue</option>
				</select>
		        <label for="comments">Comments</label>
		        <textarea name="comments" id="comments" rows="10" cols="50"></textarea>
		        </fieldset>
		        <fieldset class="radio">
		            <legend>Subscribe to our Newsletter? <span class="required">(required)</span></legend>
		            <label><input type="radio" name="newsletter" value="Yes" /> Yes</label>
		            <label><input type="radio" name="newsletter" value="No" /> No</label>
		        </fieldset>
				<fieldset class="checkbox">
		            <legend>Im interested in: <span class="required">(required)</span></legend>
		            <label><input type="checkbox" name="interested[]" value="Arts" /> Arts</label>
					<label><input type="checkbox" name="interested[]" value="Science" /> Science</label>
					<label><input type="checkbox" name="interested[]" value="Sports" /> Sports</label>
		        </fieldset>

		        <p><button type="submit">Submit this!</button></p>
		    </form>

		</body>
		</html>

RELEASE NOTES

ver 1.1.4 – Another Email Bug fixed ( Courtesy of megabonez ).
ver 1.1.3 – Email Bug fixed ( Mayor thanks to Jim from cpscreative.com ).
ver 1.1.2 – Minor Bugs fixed.
ver 1.1.1 – Optional Email DNS checking.
ver 1.1 – Easier path deployment, Configurable response variable name, Debug function and minor bug fixes.
ver 1.0 – First Release.

This is a post from: Matt Varone

SimpleForm: Easy PHP multi-form email handler

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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!

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