Location: PHPKode > scripts > Share on Facebook > share-on-facebook/shareonfacebook.php
<?php
/*
Plugin Name: Share On Facebook
Version: 1.7
Plugin URI: http://nothing.golddave.com/?page_id=680
Description: Adds a footer link to add the current post or page to as a Facebook link.
Author: David Goldstein
Author URI: http://nothing.golddave.com/
*/

/*
Change Log

1.7
  * Fixed the "You do not have sufficient permissions to access this page." message some users were getting when saving options.

1.6
  * Added comment tags around JavaScript to address errors.
  * Changed a $_SERVER['PHP_SELF'] call to $_SERVER['REQUEST_URI'] to address possible security issue.

1.5
  * Added compatibility with PHP 4.x.

1.4
  * Added option to choose to have the Facebook link appear on Posts, Pages or both (Posts and Pages).

1.3
  * Facebook's "Post to Profile" page now appears in a popup for all posts on the index page of a blog.

1.2
  * Reworked with valid XHTML.
  * Consolidated redundant code.
  * Updated styles for the button.

1.1
  * Fixed bug in template tag implementation.

1.0
  * First public release.
*/ 

function share_on_facebook($data = ''){
	global $post;
	$current_options = get_option('share_on_facebook_options');
	$p = get_post($post->ID);
	$url = 'http://www.facebook.com/share.php?u=' . rawurlencode(get_permalink($post->ID)) . '&amp;t=' . rawurlencode($p->post_title);
	$basestyle = "font-size:11px; line-height:13px; font-family:'lucida grande',tahoma,verdana,arial,sans-serif; text-decoration:none;";
	
	if (( ($current_options['page_type']=="posts") && (!is_page()) ) || ($current_options['page_type']=="pages") && (is_page()) || ($current_options['page_type']=="both")) {
		switch ($current_options['link_type']) {
			case "link":
				$data .= <<< HTML
<a href="$url" id="facebook_share_link_$post->ID">Share on Facebook</a>
HTML;
				break;
			case "icon":
				$data .= <<< HTML
<a href="$url" id="facebook_share_icon_$post->ID" style="$basestyle"><img src="http://b.static.ak.fbcdn.net/images/share/facebook_share_icon.gif" alt="Share on Facebook" /></a>
HTML;
				break;
			case "both":
				$data .= <<< HTML
<a href="$url" id="facebook_share_both_$post->ID" style="$basestyle padding:2px 0 0 20px; height:16px; background:url(http://b.static.ak.fbcdn.net/images/share/facebook_share_icon.gif) no-repeat top left;">Share on Facebook</a>
HTML;
				break;
			case "button":
				$data .= <<< HTML
<a href="$url" id="facebook_share_button_$post->ID" style="$basestyle display: -moz-inline-block; display:inline-block; padding:1px 20px 0 5px; margin: 5px 0; height:15px; border:1px solid #d8dfea; color: #3B5998; background: #fff url(http://b.static.ak.fbcdn.net/images/share/facebook_share_icon.gif) no-repeat top right;">Share</a>
HTML;
				break;
			}
		$data .= <<< HTML

	<script type="text/javascript">
	<!--
	var button = document.getElementById('facebook_share_link_$post->ID') || document.getElementById('facebook_share_icon_$post->ID') || document.getElementById('facebook_share_both_$post->ID') || document.getElementById('facebook_share_button_$post->ID');
	if (button) {
		button.onclick = function(e) {
			var url = this.href.replace(/share\.php/, 'sharer.php');
			window.open(url,'sharer','toolbar=0,status=0,width=626,height=436');
			return false;
		}
	
		if (button.id === 'facebook_share_button_$post->ID') {
			button.onmouseover = function(){
				this.style.color='#fff';
				this.style.borderColor = '#295582';
				this.style.backgroundColor = '#3b5998';
			}
			button.onmouseout = function(){
				this.style.color = '#3b5998';
				this.style.borderColor = '#d8dfea';
				this.style.backgroundColor = '#fff';
			}
		}
	}
	-->
	</script>
	
HTML;
	}
		return $data;
}

function activate_share_on_facebook(){
	global $post;
	$current_options = get_option('share_on_facebook_options');
	$insertiontype = $current_options['insertion_type'];	
	if ($insertiontype !== 'template'){
		add_filter('the_content', 'share_on_facebook', 10);
		add_filter('the_excerpt', 'share_on_facebook', 10);
	}
}

activate_share_on_facebook();

function shareonfacebook(){
	global $post;
	$current_options = get_option('share_on_facebook_options');
	$insertiontype = $current_options['insertion_type'];
	$pagetype = $current_options["page_type"];
	if ($insertiontype !== 'auto'){
		echo share_on_facebook();
	}
}

// Create the options page
function share_on_facebook_options_page() {
	$current_options = get_option('share_on_facebook_options');
	$link = $current_options["link_type"];
	$insert = $current_options["insertion_type"];
	$pagetype = $current_options["page_type"];
	if ($_POST['action']){ ?>
		<div id="message" class="updated fade"><p><strong>Options saved.</strong></p></div>
	<?php } ?>
	<div class="wrap" id="share-on-facebook-options">
		<h2>Share on Facebook Options</h2>

		<form method="post" action="<?php echo $_SERVER['REQUEST_URI']; ?>">
			<fieldset>
				<legend>Options:</legend>
				<input type="hidden" name="action" value="save_share_on_facebook_options" />
				<table width="100%" cellspacing="2" cellpadding="5" class="editform">
					<tr>
						<th valign="top" scope="row"><label for="link_type">Link Type:</label></th>
						<td><select name="link_type">
						<option value="link" <?php if ($link === "link") echo 'selected="selected"';?>>Link Only</option>
						<option value="icon" <?php if ($link === "icon") echo 'selected="selected"';?>>Icon Only</option>
						<option value ="both" <?php if ($link === "both") echo 'selected="selected"';?>>Link and Icon</option>
						<option value ="button" <?php if ($link === "button") echo 'selected="selected"';?>>Share Button</option>
						</select></td>
					</tr>
					<tr>
						<th valign="top" scope="row"><label for="insertion_type">Insertion Type:</label></th>
						<td><select name="insertion_type">
						<option value ="auto" <?php if ($insert === "auto") echo 'selected="selected"';?>>Auto</option>
						<option value ="template"<?php if ($insert === "template") echo 'selected="selected"';?>>Template</option>
						</select></td>
					</tr>
					<tr>
						<th valign="top" scope="row"><label for="page_type">Page Type:</label></th>
						<td><select name="page_type">
						<option value="posts" <?php if ($pagetype === "posts") echo 'selected="selected"';?>>Posts Only</option>
						<option value="pages" <?php if ($pagetype === "pages") echo 'selected="selected"';?>>Pages Only</option>
						<option value ="both" <?php if ($pagetype === "both") echo 'selected="selected"';?>>Posts and Pages</option>
						</select></td>
					</tr>
				</table>
			</fieldset>
			<p class="submit">
				<input type="submit" name="Submit" value="Update Options &raquo;" />
			</p>
		</form>
	</div>
<?php
}

function share_on_facebook_add_options_page() {
	// Add a new menu under Options:
	add_options_page('Share on Facebook', 'Share on Facebook', 10, __FILE__, 'share_on_facebook_options_page');
}

function share_on_facebook_save_options() {
	// create array
	$share_on_facebook_options["link_type"] = $_POST["link_type"];
	$share_on_facebook_options["insertion_type"] = $_POST["insertion_type"];
	$share_on_facebook_options["page_type"] = $_POST["page_type"];

	update_option('share_on_facebook_options', $share_on_facebook_options);
	$options_saved = true;
}

add_action('admin_menu', 'share_on_facebook_add_options_page');

if (!get_option('share_on_facebook_options')){
	// create default options
	$share_on_facebook_options["link_type"] = 'link';
	$share_on_facebook_options["insertion_type"] = 'auto';
	$share_on_facebook_options["page_type"] = 'posts';

	update_option('share_on_facebook_options', $share_on_facebook_options);
}

if ($_POST['action'] == 'save_share_on_facebook_options'){
	share_on_facebook_save_options();
}





function shareonfacebook_widget(){
	global $wp_query;
	if(is_home()||is_front_page()||is_category() || is_archive() || is_tag() || is_month()) {
		$thePostID = '0';
		echo "This is the home page.";
		$url = 'http://www.facebook.com/share.php?u=' . rawurlencode($_SERVER['HTTP_HOST']  . $_SERVER['REQUEST_URI']) . '&amp;t=' . bloginfo('name');
	}
	else{
		$thePostID = $wp_query->post->ID;
		$p = get_post($thePostID);
		$url = 'http://www.facebook.com/share.php?u=' . rawurlencode(get_permalink($thePostID)) . '&amp;t=' . rawurlencode($p->post_title);
	}
//	$p = get_post($thePostID);
//	$url = 'http://www.facebook.com/share.php?u=' . rawurlencode(get_permalink($thePostID)) . '&amp;t=' . rawurlencode($p->post_title);
	$basestyle = "font-size:11px; line-height:13px; font-family:'lucida grande',tahoma,verdana,arial,sans-serif; text-decoration:none;";
//	$current_options = get_option('share_on_facebook_options');
	echo $thePostID.'<br><a href="'.$url.'" id="facebook_share_button_$thePostID" style="$basestyle display: -moz-inline-block; display:inline-block; padding:1px 20px 0 5px; margin: 5px 0; height:15px; border:1px solid #d8dfea; color: #3B5998; background: #fff url(http://b.static.ak.fbcdn.net/images/share/facebook_share_icon.gif) no-repeat top right;">Share</a>
	<script type="text/javascript">
	<!--
	var button = document.getElementById(\'facebook_share_link_$thePostID\') || document.getElementById(\'facebook_share_icon_$thePostID\') || document.getElementById(\'facebook_share_both_$thePostID\') || document.getElementById(\'facebook_share_button_$thePostID\');
	if (button) {
		button.onclick = function(e) {
			var url = this.href.replace(/share\.php/, \'sharer.php\');
			window.open(url,\'sharer\',\'toolbar=0,status=0,width=626,height=436\');
			return false;
		}
	
		if (button.id === \'facebook_share_button_$thePostID\') {
			button.onmouseover = function(){
				this.style.color=\'#fff\';
				this.style.borderColor = \'#295582\';
				this.style.backgroundColor = \'#3b5998\';
			}
			button.onmouseout = function(){
				this.style.color = \'#3b5998\';
				this.style.borderColor = \'#d8dfea\';
				this.style.backgroundColor = \'#fff\';
			}
		}
	}
	-->
	</script>';
	}

function widget_share_on_facebook_register() {
	function widget_share_on_facebook($args) {
          extract($args);
      ?>
              <?php echo $before_widget; ?>
                  <?php echo $before_title
                      . 'Share on Facebook'
                      . $after_title; 
                  shareonfacebook_widget();
              echo $after_widget; ?>
      <?php
      }
      register_sidebar_widget('Share on Facebook', 'widget_share_on_facebook');}
add_action('init', widget_share_on_facebook_register);

?>
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