settings.php

<?php

add_action('admin_menu', 'wp_add_related_posts_options_page');

function wp_add_related_posts_options_page() {
	$page = add_options_page(__('Related Posts','wp_related_posts'), __('Related Posts','wp_related_posts'), 'manage_options', 'wordpress-related-posts', 'wp_related_posts_options_subpanel');

	add_action('admin_print_scripts-' . $page, 'wp_rp_themes_scripts');
}

function wp_rp_themes_scripts() {
	wp_enqueue_script("wp_rp_themes_script", plugins_url("static/themes.js", __FILE__), array( 'jquery' ) );
}

function wp_related_posts_options_subpanel() {
	if (isset($_POST["wp_rp_Submit"]) && $_POST["wp_rp_Submit"]){
		$message = __("WordPress Related Posts Setting Updated",'wp_related_posts');

		$wp_rp_saved = get_option("wp_rp");

		$wp_rp = array (
			"wp_rp_title" 			=> isset($_POST['wp_rp_title_option']) ? trim($_POST['wp_rp_title_option']) : false,
			"wp_rp_title_tag"		=> isset($_POST['wp_rp_title_tag_option']) ? trim($_POST['wp_rp_title_tag_option']) : false,
			"wp_no_rp"				=> isset($_POST['wp_no_rp_option']) ? trim($_POST['wp_no_rp_option']) : false,
			"wp_no_rp_text"			=> isset($_POST['wp_no_rp_text_option']) ? trim($_POST['wp_no_rp_text_option']) : false,
			"wp_rp_except"			=> isset($_POST['wp_rp_except_option']) ? trim($_POST['wp_rp_except_option']) : false,
			"wp_rp_except_number"	=> isset($_POST['wp_rp_except_number_option']) ? trim($_POST['wp_rp_except_number_option']) : false,
			"wp_rp_limit"			=> isset($_POST['wp_rp_limit_option']) ? trim($_POST['wp_rp_limit_option']) : false,
			'wp_rp_exclude'			=> isset($_POST['wp_rp_exclude_option']) ? join(',', $_POST['wp_rp_exclude_option']) : false,
			'wp_rp_auto'			=> isset($_POST['wp_rp_auto_option']) ? trim($_POST['wp_rp_auto_option']) : false,
			'wp_rp_rss'				=> isset($_POST['wp_rp_rss_option']) ? trim($_POST['wp_rp_rss_option']) : false,
			'wp_rp_comments'		=> isset($_POST['wp_rp_comments_option']) ? trim($_POST['wp_rp_comments_option']) : false,
			'wp_rp_date'			=> isset($_POST['wp_rp_date_option']) ? trim($_POST['wp_rp_date_option']) : false,
			'wp_rp_thumbnail'		=> isset($_POST['wp_rp_thumbnail_option']) ? trim($_POST['wp_rp_thumbnail_option']) : false,
			'wp_rp_thumbnail_text'	=> isset($_POST['wp_rp_thumbnail_text_option']) ? trim($_POST['wp_rp_thumbnail_text_option']) : false,
			'wp_rp_thumbnail_post_meta'	=> isset($_POST['wp_rp_thumbnail_post_meta_option']) ? trim($_POST['wp_rp_thumbnail_post_meta_option']) : false,
			'wp_rp_thumbnail_extract'	=> isset($_POST['wp_rp_thumbnail_extract']) ? trim($_POST['wp_rp_thumbnail_extract']) : false,
			'wp_rp_thumbnail_featured'	=> isset($_POST['wp_rp_thumbnail_featured']) ? trim($_POST['wp_rp_thumbnail_featured']) : false,
			'wp_rp_theme'	=> isset($_POST['wp_rp_theme']) ? trim($_POST['wp_rp_theme']) : false
		);

		$default_thumbnail_path = wp_rp_upload_default_thumbnail_file();
		if ($default_thumbnail_path) {
			$wp_rp['wp_rp_default_thumbnail_path'] = $default_thumbnail_path;
		} else {
			if (!isset($_POST['wp_rp_default_thumbnail_remove']) || !$_POST['wp_rp_default_thumbnail_remove']) {
				$wp_rp['wp_rp_default_thumbnail_path'] = $wp_rp_saved['wp_rp_default_thumbnail_path'];
			}
		}

		if ($wp_rp_saved != $wp_rp)
			if(!update_option("wp_rp",$wp_rp))
				$message = "Update Failed";

		echo '<div id="message" class="updated fade"><p>'.$message.'.</p></div>';
	}

	$wp_rp = get_option("wp_rp");

?>

	<div class="wrap">
	<?php
		$wp_no_rp = $wp_rp["wp_no_rp"];
		$wp_rp_title_tag = $wp_rp["wp_rp_title_tag"];

		$wp_rp_theme = isset($wp_rp['wp_rp_theme']) ? $wp_rp['wp_rp_theme'] : WP_RP_THEME_DEFAULT;

		include dirname(__FILE__) . "/static/settings.js.php";

		if (isset($wp_rp['wp_rp_log_new_user']) && $wp_rp['wp_rp_log_new_user']) {
			$wp_rp['wp_rp_log_new_user'] = false;
			update_option('wp_rp', $wp_rp);
		}
	?>

		<input type="hidden" id="wp_rp_theme_url" value="<?=WP_RP_STATIC_BASE_URL . WP_RP_THEMES_PATH?>" />
		<input type="hidden" id="wp_rp_json_url" value="<?=WP_RP_STATIC_BASE_URL . WP_RP_JSON_PATH?>" />
		<input type="hidden" id="wp_rp_version" value="<?=WP_RP_VERSION?>" />
		<input type="hidden" id="wp_rp_theme_selected" value="<?=$wp_rp_theme?>" />

		<h2><?php _e("Related Posts Settings",'wp_related_posts');?></h2>

		<div id="wp-rp-survey" class="updated highlight" style="display:none;"><p><?php _e("Please fill out",'wp_related_posts');?> <a class="link" target="_blank" href="http://wprelatedposts.polldaddy.com/s/new-features"><?php _e("a quick survey", 'wp_related_posts');?></a>.<a href="#" class="close" style="float: right;">x</a></p></div>

	<?php if (!isset($wp_rp["wp_rp_thumbnail"]) || !$wp_rp["wp_rp_thumbnail"]) { ?>
		<div id="wp-rp-thumbnails-info" class="updated" style="display:none;"><p><?php _e("Check out the new and updated <i>Related posts with Thumbnails</i> by clicking and checking the <i>Display Thumbnails For Related Posts</i> setting",'wp_related_posts');?>.<a href="#" class="close" style="float: right;">x</a></p></div>
	<?php } ?>

		<p><?php _e("WordPress Related Posts Plugin places a list of related articles via WordPress tags at the bottom of your post.",'wp_related_posts');?> </p>
		<?php _e("If you have any questions please contact us at",'wp_related_posts');?> <a target="_blank" href="mailto:relatedpostsplugin@gmail.com"><?php _e("support", 'wp_related_posts');?></a>.</p>

		<form method="post" enctype="multipart/form-data" action="<?php echo $_SERVER['PHP_SELF']; ?>?page=wordpress-related-posts">
		<h3><?php _e("Basic Settings",'wp_related_posts');?></h3>
		<table class="form-table">
		  <tr valign="top">
			<th scope="row"><?php _e("Related Posts Title:",'wp_related_posts'); ?></th>
			<td>
			  <input name="wp_rp_title_option" type="text" id="wp_rp_title"  value="<?php echo $wp_rp["wp_rp_title"]; ?>" class="regular-text" />
			</td>
		</tr>
		<tr valign="top">
			<th scope="row"><?php _e("Maximum Number of Posts:",'wp_related_posts');?></th>
			<td>
			  <input name="wp_rp_limit_option" type="number" step="1" id="wp_rp_limit" value="<?php echo $wp_rp["wp_rp_limit"]; ?>" />
			</td>
		</tr>
		<tr valign="top">
			<th scope="row"><?php _e("Categories to Exclude:",'wp_related_posts');?></th>
			<td>
				<?php
				$exclude = explode(",",$wp_rp["wp_rp_exclude"]);
				$args = array(
					'orderby' => 'name',
					'order' => 'ASC',
					'hide_empty' => false
					);
				foreach (get_categories($args) as $category) {
				?>
				<label>
					<input name="wp_rp_exclude_option[]" type="checkbox" id="wp_rp_exclude" value="<?=$category->cat_ID?>" <?= in_array($category->cat_ID, $exclude) ? "checked=\"checked\"" : ""; ?> />
					<?=$category->cat_name?>
					<br />
				</label>
				<?php } ?>
			</td>
		</tr>
		</table>
		<h3>Theme Settings <small style="color: #c33;">(new)</small></h3>
		<table class="form-table">
			<tr id="wp_rp_theme_options_wrap"></tr>
			<tr>
				<th scope="row"><?php _e("Thumbnail Options:",'wp_related_posts'); ?></th>
				<td>
					<label>
						<input name="wp_rp_thumbnail_option" type="checkbox" id="wp_rp_thumbnail" value="yes"<?php checked($wp_rp["wp_rp_thumbnail"], 'yes'); ?> onclick="wp_rp_thumbnail_onclick();" >
						<?php _e("Display Thumbnails For Related Posts",'wp_related_posts');?>
					</label>
					<br />
					<span id="wp_rp_thumbnail_span" style="<?php echo ($wp_rp["wp_rp_thumbnail"] == 'yes') ? '' : 'display:none;'; ?>">
					<label>
						<input name="wp_rp_thumbnail_text_option" type="checkbox" id="wp_rp_thumbnail_text" value="yes" <?php checked($wp_rp["wp_rp_thumbnail_text"], 'yes'); ?>>
						<?php _e("Display Post Titles",'wp_related_posts');?>
					</label>
					<br />

					<?php
					global $wpdb;

					$post_metas = $wpdb->get_col( "SELECT meta_key FROM $wpdb->postmeta GROUP BY meta_key HAVING meta_key NOT LIKE '\_%' ORDER BY LOWER(meta_key)" );
					$show_custom_thumbnails = wp_rp_show_custom_thumbnails($wp_rp);

					if($post_metas) {
					?>
					<label><input name="wp_rp_thumbnail_featured" type="radio" value="yes" <?php checked(!$show_custom_thumbnails); ?>> Use featured image</label>&nbsp;&nbsp;&nbsp;&nbsp;
					<label><input name="wp_rp_thumbnail_featured" type="radio" value="no" <?php checked($show_custom_thumbnails); ?>> Use custom field</label>

					<select name="wp_rp_thumbnail_post_meta_option" id="wp_rp_thumbnail_post_meta"  class="postform">
					<?php
					foreach ( $post_metas as $post_meta ) {
						$post_meta = esc_attr( $post_meta );
					?>
						<option value="<?php echo $post_meta; ?>"<?php selected($wp_rp["wp_rp_thumbnail_post_meta"], $post_meta); ?>><?php echo $post_meta;?></option>
					<?php
					}
					?>
					</select>
					<br />
					<?php } ?>

					<label>
						<input name="wp_rp_thumbnail_extract" type="checkbox" value="yes"<?php checked($wp_rp["wp_rp_thumbnail_extract"], 'yes'); ?>>
						<?php _e("If featured image is missing, show the first uploaded image of the post",'wp_related_posts');?>
					</label>
					<br />


					<br />
					<label>
						<?php _e("For posts without images, a default image will be shown. <br/>
  You can upload your own default image here",'wp_related_posts');?>
						<input type="file" name="wp_rp_default_thumbnail"  />
					</label>
					<?php if (isset($wp_rp['wp_rp_default_thumbnail_path']) && $wp_rp['wp_rp_default_thumbnail_path']) { ?>
						<span  style="display: inline-block; vertical-align: top; *display: inline; zoom: 1;">
							<img style="padding: 3px; border: 1px solid #DFDFDF; border-radius: 3px;" valign="top" width="80" height="80" src="<?=wp_rp_get_default_thumbnail_url();?>" alt="selected thumbnail" />
							<br />
							<label>
								<input type="checkbox" name="wp_rp_default_thumbnail_remove" />
								<?php _e("Remove selected",'wp_related_posts');?>
							</label>
						</span>
					<?php } ?>
					</span>
				</td>
			</tr>
			<tr>
				<th scope="row"><?php _e("Display Options:",'wp_related_posts'); ?></th>
				<td>
					<label>
					<input name="wp_rp_comments_option" type="checkbox" id="wp_rp_comments" value="yes"<?php checked($wp_rp["wp_rp_comments"], 'yes'); ?>>
					<?php _e("Display Number of Comments",'wp_related_posts');?>
					</label>
					<br />
					<label>
					<input name="wp_rp_date_option" type="checkbox" id="wp_rp_date" value="yes"<?php checked($wp_rp["wp_rp_date"], 'yes'); ?>>
					<?php _e("Display Publish Date",'wp_related_posts');?>
					</label>
					<br />
					<label>
						<input name="wp_rp_except_option" type="checkbox" id="wp_rp_except" value="yes"<?php checked($wp_rp["wp_rp_except"], 'yes'); ?> onclick="wp_rp_except_onclick();" >
						<?php _e("Display Post Excerpt",'wp_related_posts');?>
					</label>
					<label id="wp_rp_except_number_label" style="<?php echo ($wp_rp["wp_rp_except"] == 'yes') ? '' : 'display:none;'; ?>">
						<input name="wp_rp_except_number_option" type="text" id="wp_rp_except_number" value="<?php echo ($wp_rp["wp_rp_except_number"]); ?> "  /> <span class="description"><?php _e('Maximum Number of Characters.','wp_related_posts'); ?></span>
					</label>
					<br />
					<label for="wp_rp_title_tag">
						<?php _e("Related Posts Title Tag",'wp_related_posts'); ?>
						<select name="wp_rp_title_tag_option" id="wp_rp_title_tag" class="postform">
						<?php
						$wp_rp_title_tag_array = array('h2', 'h3', 'h4', 'p', 'div');

						if(!isset($wp_rp_title_tag) || $wp_rp_title_tag === false)
							$wp_rp_title_tag = WP_RP_TITLE_TAG_DEFAULT;

						foreach ($wp_rp_title_tag_array as $wp_rp_title_tag_a) {
						?>
							<option value="<?php echo esc_attr($wp_rp_title_tag_a); ?>"<?php selected($wp_rp_title_tag, $wp_rp_title_tag_a); ?>>&lt;<?php echo esc_html($wp_rp_title_tag_a); ?>&gt;</option>
						<?php 
						}
						?>
						</select>
					</label>
				</td>
			</tr>
		</table>

		<h3><?php _e("If there are no related posts",'wp_related_posts');?></h3>
		<table class="form-table">
			<tr valign="top">
				<th scope="row"><?php _e("Display:",'wp_related_posts'); ?></th>
				<td>
					<select name="wp_no_rp_option" id="wp_no_rp" onchange="wp_no_rp_onchange();"  class="postform">
						<option value="text"<?php selected($wp_no_rp, 'text'); ?> ><?php _e("Text: 'No Related Posts'",'wp_related_posts'); ?></option>
						<option value="random"<?php selected($wp_no_rp, 'random'); ?>><?php _e("Random Posts",'wp_related_posts'); ?></option>
						<option value="commented"<?php selected($wp_no_rp, 'commented'); ?>><?php _e("Most Commented Posts",'wp_related_posts'); ?></option>
						<?php if (function_exists('akpc_most_popular')){ ?>
						<option value="popularity" <?php selected($wp_no_rp, 'popularity'); ?>><?php _e("Most Popular Posts",'wp_related_posts'); ?></option>
						<?php } ?> 
					</select>
				</td>
			</tr>
			<tr valign="top" scope="row">
				<th id="wp_no_rp_title" scope="row">
				<?php 
				switch($wp_no_rp) {
					case 'text':
						_e("No Related Posts Text:", 'wp_related_posts'); 
						break;
					case 'random':
						_e("Random Posts Title:", 'wp_related_posts'); 
						break;
					case 'commented':
						_e("Most Commented Posts Title:", 'wp_related_posts'); 
						break;
					case 'popularity':
						_e("Most Popular Posts Title:", 'wp_related_posts'); 
						break;
				}
				?>
				</th>
				<td>
					<input name="wp_no_rp_text_option" type="text" id="wp_no_rp_text" value="<?php echo $wp_rp["wp_no_rp_text"]; ?>" class="regular-text" />
				</td>
			</tr>
		</table>
		<table class="form-table">
			<h3><?php _e("Other Settings:",'wp_related_posts'); ?></h3>
			<tr valign="top">
				<td>
					<label>
					<input name="wp_rp_auto_option" type="checkbox" id="wp_rp_auto" value="yes"<?php checked($wp_rp["wp_rp_auto"], 'yes'); ?>>
					<?php _e("Auto Insert Related Posts",'wp_related_posts');?>
					</label>
					<br />
					<label>
					<input name="wp_rp_rss_option" type="checkbox" id="wp_rp_rss" value="yes"<?php checked($wp_rp["wp_rp_rss"], 'yes'); ?>>
					<?php _e("Display Related Posts in Feed",'wp_related_posts');?>
					</label>
				</td>
			</tr>
		</table>
		<p class="submit"><input type="submit" value="<?php _e("Save changes",'wp_related_posts');?>" name="wp_rp_Submit" class="button-primary" /></p>
	  </form>
	</div>
<?php }