Error in sub page

(@alex_p7)
After some fixes of file, Wp return me this error in domain.com/xx/ page
Notice: Undefined index: path in /var/www/html/p7group/public_html/wp-content/plugins/custom-permalinks/custom-permalinks.php on line 280
<?php
/*
Plugin Name: Custom Permalinks
Plugin URI: http://atastypixel.com/blog/wordpress/plugins/custom-permalinks/
Donate link: http://atastypixel.com/blog/wordpress/plugins/custom-permalinks/
Description: Set custom permalinks on a per-post basis
Version: 0.7.19
Author: Michael Tyson
Author URI: http://atastypixel.com/blog
*/

/*  Copyright 2008 Michael Tyson <mike@tyson.id.au>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
 ** Actions and filters
 **
 **/

/**
 * Filter to replace the post permalink with the custom one
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_post_link($permalink, $post) {
	$custom_permalink = get_post_meta( $post->ID, 'custom_permalink', true );
	if ( $custom_permalink ) {
		return home_url()."/".$custom_permalink;
	}

	return $permalink;
}

/**
 * Filter to replace the page permalink with the custom one
 *
 * @package CustomPermalinks
 * @since 0.4
 */
function custom_permalinks_page_link($permalink, $page) {
	$custom_permalink = get_post_meta( $page, 'custom_permalink', true );
	if ( $custom_permalink ) {
		return home_url()."/".$custom_permalink;
	}

	return $permalink;
}

/**
 * Filter to replace the term permalink with the custom one
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_term_link($permalink, $term) {
	$table = get_option('custom_permalink_table');
	if ( is_object($term) ) $term = $term->term_id;

	$custom_permalink = custom_permalinks_permalink_for_term($term);

	if ( $custom_permalink ) {
		return home_url()."/".$custom_permalink;
	}

	return $permalink;
}

/**
 * Action to redirect to the custom permalink
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_redirect() {

	// Get request URI, strip parameters
	$url = parse_url(get_bloginfo('url'));
	$url = isset($url['path']) ? $url['path'] : '';
	$request = ltrim(substr($_SERVER['REQUEST_URI'], strlen($url)),'/');
	if ( ($pos=strpos($request, "?")) ) $request = substr($request, 0, $pos);

	global $wp_query;

	$custom_permalink = '';
	$original_permalink = '';

	// If the post/tag/category we're on has a custom permalink, get it and check against the request
	if ( is_single() || is_page() ) {
		$post = $wp_query->post;
		$custom_permalink = get_post_meta( $post->ID, 'custom_permalink', true );
		$original_permalink = ( $post->post_type == 'page' ? custom_permalinks_original_page_link( $post->ID ) : custom_permalinks_original_post_link( $post->ID ) );
	} else if ( is_tag() || is_category() ) {
		$theTerm = $wp_query->get_queried_object();
		$custom_permalink = custom_permalinks_permalink_for_term($theTerm->term_id);
		$original_permalink = (is_tag() ? custom_permalinks_original_tag_link($theTerm->term_id) :
							   			  custom_permalinks_original_category_link($theTerm->term_id));
	}

	if ( $custom_permalink &&
			(substr($request, 0, strlen($custom_permalink)) != $custom_permalink ||
			 $request == $custom_permalink."/" ) ) {
		// Request doesn't match permalink - redirect
		$url = $custom_permalink;

		if ( substr($request, 0, strlen($original_permalink)) == $original_permalink &&
				trim($request,'/') != trim($original_permalink,'/') ) {
			// This is the original link; we can use this url to derive the new one
			$url = preg_replace('@//*@', '/', str_replace(trim($original_permalink,'/'), trim($custom_permalink,'/'), $request));
			$url = preg_replace('@([^?]*)&@', '\1?', $url);
		}

		// Append any query compenent
		$url .= strstr($_SERVER['REQUEST_URI'], "?");

		wp_redirect( home_url()."/".$url, 301 );
		exit();
	}
}

/**
 * Filter to rewrite the query if we have a matching post
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_request($query) {
	global $wpdb;
	global $_CPRegisteredURL;

	// First, search for a matching custom permalink, and if found, generate the corresponding
	// original URL

	$originalUrl = NULL;

	// Get request URI, strip parameters and /'s
	$url = parse_url(get_bloginfo('url'));
	$url = isset($url['path']) ? $url['path'] : '';
	$request = ltrim(substr($_SERVER['REQUEST_URI'], strlen($url)),'/');
	$request = (($pos=strpos($request, '?')) ? substr($request, 0, $pos) : $request);
	$request_noslash = preg_replace('@/+@','/', trim($request, '/'));

	if ( !$request ) return $query;

	// Queries are now WP3.9 compatible (by Steve from Sowmedia.nl)
    $sql = $wpdb->prepare("SELECT $wpdb->posts.ID, $wpdb->postmeta.meta_value, $wpdb->posts.post_type FROM $wpdb->posts  ".
	            "LEFT JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id) WHERE ".
	            "  meta_key = 'custom_permalink' AND ".
	            "  meta_value != '' AND ".
	            "  ( LOWER(meta_value) = LEFT(LOWER('%s'), LENGTH(meta_value)) OR ".
	            "    LOWER(meta_value) = LEFT(LOWER('%s'), LENGTH(meta_value)) ) ".
	            "  AND post_status != 'trash' AND post_type != 'nav_menu_item'".
	            " ORDER BY LENGTH(meta_value) DESC, ".
	            " FIELD(post_status,'publish','private','draft','auto-draft','inherit'),".
	            " FIELD(post_type,'post','page'),".
	            "$wpdb->posts.ID ASC  LIMIT 1",
			$request_noslash,
			$request_noslash."/"
		    );

	$posts = $wpdb->get_results($sql);

	if ( $posts ) {
		// A post matches our request

		// Preserve this url for later if it's the same as the permalink (no extra stuff)
		if ( $request_noslash == trim($posts[0]->meta_value,'/') )
			$_CPRegisteredURL = $request;

		$originalUrl = 	preg_replace( '@/+@', '/', str_replace( trim( strtolower($posts[0]->meta_value),'/' ),
									( $posts[0]->post_type == 'page' ?
											custom_permalinks_original_page_link($posts[0]->ID)
											: custom_permalinks_original_post_link($posts[0]->ID) ),
								   strtolower($request_noslash) ) );
	}

	if ( $originalUrl === NULL ) {
	    // See if any terms have a matching permalink
		$table = get_option('custom_permalink_table');
		if ( !$table ) return $query;

		foreach ( array_keys($table) as $permalink ) {
			if ( $permalink == substr($request_noslash, 0, strlen($permalink)) ||
			     $permalink == substr($request_noslash."/", 0, strlen($permalink)) ) {
				$term = $table[$permalink];

				// Preserve this url for later if it's the same as the permalink (no extra stuff)
				if ( $request_noslash == trim($permalink,'/') )
					$_CPRegisteredURL = $request;

				if ( $term['kind'] == 'category') {
					$originalUrl = str_replace(trim($permalink,'/'),
										       custom_permalinks_original_category_link($term['id']),
											   trim($request,'/'));
				} else {
					$originalUrl = str_replace(trim($permalink,'/'),
										       custom_permalinks_original_tag_link($term['id']),
											   trim($request,'/'));
				}
			}
		}
	}

	if ( $originalUrl !== NULL ) {
		$originalUrl = str_replace('//', '/', $originalUrl);

		if ( ($pos=strpos($_SERVER['REQUEST_URI'], '?')) !== false ) {
			$queryVars = substr($_SERVER['REQUEST_URI'], $pos+1);
			$originalUrl .= (strpos($originalUrl, '?') === false ? '?' : '&') . $queryVars;
		}

		// Now we have the original URL, run this back through WP->parse_request, in order to
		// parse parameters properly.  We set $_SERVER variables to fool the function.
		$oldRequestUri = $_SERVER['REQUEST_URI']; $oldQueryString = $_SERVER['QUERY_STRING'];
		$_SERVER['REQUEST_URI'] = '/'.ltrim($originalUrl,'/');
		$_SERVER['QUERY_STRING'] = (($pos=strpos($originalUrl, '?')) !== false ? substr($originalUrl, $pos+1) : '');
		parse_str($_SERVER['QUERY_STRING'], $queryArray);
		$oldValues = array();
		if ( is_array($queryArray) )
		foreach ( $queryArray as $key => $value ) {
			$oldValues[$key] = $_REQUEST[$key];
			$_REQUEST[$key] = $_GET[$key] = $value;
		}

		// Re-run the filter, now with original environment in place
		remove_filter( 'request', 'custom_permalinks_request', 10, 1 );
		global $wp;
		$wp->parse_request();
		$query = $wp->query_vars;
		add_filter( 'request', 'custom_permalinks_request', 10, 1 );

		// Restore values
		$_SERVER['REQUEST_URI'] = $oldRequestUri; $_SERVER['QUERY_STRING'] = $oldQueryString;
		foreach ( $oldValues as $key => $value ) {
			$_REQUEST[$key] = $value;
		}
	}

	return $query;
}

/**
 * Filter to handle trailing slashes correctly
 *
 * @package CustomPermalinks
 * @since 0.3
 */
function custom_permalinks_trailingslash($string, $type) {
	global $_CPRegisteredURL;

	$url = parse_url(get_bloginfo('url'));
	if ( ! empty( $url['path'] ) ) {
        $request = ltrim(substr($string, strlen($url['path'])),'/');
    } else {
        $request = ltrim($string, '/');
    }

	if ( !trim($request) ) return $string;

	if ( trim($_CPRegisteredURL,'/') == trim($request,'/') ) {
		return ($string{0} == '/' ? '/' : '') . trailingslashit($url['path']) . $_CPRegisteredURL;
	}
	return $string;
}

/**
 ** Administration
 **
 **/

/**
 * Per-post/page options (WordPress > 2.9)
 *
 * @package CustomPermalinks
 * @since 0.6
 */
function custom_permalink_get_sample_permalink_html($html, $id, $new_title, $new_slug) {
    $permalink = get_post_meta( $id, 'custom_permalink', true );
	$post = get_post($id);

	ob_start();
	?>
	<?php custom_permalinks_form($permalink, ($post->post_type == "page" ? custom_permalinks_original_page_link($id) : custom_permalinks_original_post_link($id)), false); ?>
	<?php
	$content = ob_get_contents();
	ob_end_clean();

    if ( 'publish' == $post->post_status ) {
        $view_post = 'page' == $post->post_type ? __('View Page') : __('View Post');
	}

	if ( preg_match("@view-post-btn.*?href='([^']+)'@s", $html, $matches) ) {
	    $permalink = $matches[1];
    } else {
        list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);
        if ( false !== strpos($permalink, '%postname%') || false !== strpos($permalink, '%pagename%') ) {
            $permalink = str_replace(array('%pagename%','%postname%'), $post_name, $permalink);
        }
    }

	return '<strong>' . __('Permalink:') . "</strong>\n" . $content .
	     ( isset($view_post) ? "<span id='view-post-btn'><a href='$permalink' class='button' target='_blank'>$view_post</a></span>\n" : "" );
}

/**
 * Per-post options (WordPress < 2.9)
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_post_options() {
	global $post;
	$post_id = $post;
	if (is_object($post_id)) {
		$post_id = $post_id->ID;
	}

	$permalink = get_post_meta( $post_id, 'custom_permalink', true );

	?>
	<div class="postbox closed">
	<h3><?php _e('Custom Permalink', 'custom-permalink') ?></h3>
	<div class="inside">
	<?php custom_permalinks_form($permalink, custom_permalinks_original_post_link($post_id)); ?>
	</div>
	</div>
	<?php
}

/**
 * Per-page options (WordPress < 2.9)
 *
 * @package CustomPermalinks
 * @since 0.4
 */
function custom_permalinks_page_options() {
	global $post;
	$post_id = $post;
	if (is_object($post_id)) {
		$post_id = $post_id->ID;
	}

	$permalink = get_post_meta( $post_id, 'custom_permalink', true );

	?>
	<div class="postbox closed">
	<h3><?php _e('Custom Permalink', 'custom-permalink') ?></h3>
	<div class="inside">
	<?php custom_permalinks_form($permalink, custom_permalinks_original_page_link($post_id)); ?>
	</div>
	</div>
	<?php
}

/**
 * Per-category/tag options
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_term_options($object) {
	$permalink = custom_permalinks_permalink_for_term($object->term_id);

	if ( $object->term_id ) {
    	$originalPermalink = ($object->taxonomy == 'post_tag' ?
    								custom_permalinks_original_tag_link($object->term_id) :
    								custom_permalinks_original_category_link($object->term_id) );
    }

	custom_permalinks_form($permalink, $originalPermalink);

	// Move the save button to above this form
	wp_enqueue_script('jquery');
	?>
	<script type="text/javascript">
	jQuery(document).ready(function() {
		var button = jQuery('#custom_permalink_form').parent().find('.submit');
		button.remove().insertAfter(jQuery('#custom_permalink_form'));
	});
	</script>
	<?php
}

/**
 * Helper function to render form
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_form($permalink, $original="", $renderContainers=true) {
	?>
	<input value="true" type="hidden" name="custom_permalinks_edit" />
	<input value="<?php echo htmlspecialchars(urldecode($permalink)) ?>" type="hidden" name="custom_permalink" id="custom_permalink" />

	<?php if ( $renderContainers ) : ?>
	<table class="form-table" id="custom_permalink_form">
	<tr>
		<th scope="row"><?php _e('Custom Permalink', 'custom-permalink') ?></th>
		<td>
	<?php endif; ?>
			<?php echo home_url() ?>/
			<input type="text" class="text" value="<?php echo htmlspecialchars($permalink ? urldecode($permalink) : urldecode($original)) ?>"
				style="width: 250px; <?php if ( !$permalink ) echo 'color: #ddd;' ?>"
			 	onfocus="if ( this.style.color = '#ddd' ) { this.style.color = '#000'; }"
				onblur="document.getElementById('custom_permalink').value = this.value; if ( this.value == '' || this.value == '<?php echo htmlspecialchars(urldecode($original)) ?>' ) { this.value = '<?php echo htmlspecialchars(urldecode($original)) ?>'; this.style.color = '#ddd'; }"/>
	<?php if ( $renderContainers ) : ?>
			<br />
			<small><?php _e('Leave blank to disable', 'custom-permalink') ?></small>

		</td>
	</tr>
	</table>
	<?php
	endif;
}

/**
 * Save per-post options
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_save_post($id) {
	if ( !isset($_REQUEST['custom_permalinks_edit']) ) return;

	delete_post_meta( $id, 'custom_permalink' );

	$original_link = custom_permalinks_original_post_link($id);
	$permalink_structure = get_option('permalink_structure');

	if ( $_REQUEST['custom_permalink'] && $_REQUEST['custom_permalink'] != $original_link ) {
	    add_post_meta( $id, 'custom_permalink', str_replace('%2F', '/', urlencode(ltrim(stripcslashes($_REQUEST['custom_permalink']),"/"))) );
	}
}

/**
 * Save per-tag options
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_save_tag($id) {
	if ( !isset($_REQUEST['custom_permalinks_edit']) || isset($_REQUEST['post_ID']) ) return;
	$newPermalink = ltrim(stripcslashes($_REQUEST['custom_permalink']),"/");

	if ( $newPermalink == custom_permalinks_original_tag_link($id) )
		$newPermalink = ''; 

	$term = get_term($id, 'post_tag');
	custom_permalinks_save_term($term, str_replace('%2F', '/', urlencode($newPermalink)));
}

/**
 * Save per-category options
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_save_category($id) {
	if ( !isset($_REQUEST['custom_permalinks_edit']) || isset($_REQUEST['post_ID']) ) return;
	$newPermalink = ltrim(stripcslashes($_REQUEST['custom_permalink']),"/");

	if ( $newPermalink == custom_permalinks_original_category_link($id) )
		$newPermalink = ''; 

	$term = get_term($id, 'category');
	custom_permalinks_save_term($term, str_replace('%2F', '/', urlencode($newPermalink)));
}

/**
 * Save term (common to tags and categories)
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_save_term($term, $permalink) {

	custom_permalinks_delete_term($term->term_id);
	$table = get_option('custom_permalink_table');
	if ( $permalink )
		$table[$permalink] = array(
			'id' => $term->term_id,
			'kind' => ($term->taxonomy == 'category' ? 'category' : 'tag'),
			'slug' => $term->slug);

	update_option('custom_permalink_table', $table);
}

/**
 * Delete post
 *
 * @package CustomPermalinks
 * @since 0.7.14
 * @author Piero <maltesepiero@gmail.com>
 */
function custom_permalinks_delete_permalink( $id ){
	global $wpdb;
	// Queries are now WP3.9 compatible (by Steve from Sowmedia.nl)
	$wpdb->query($wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE <code>meta_key</code> = 'custom_permalink' AND <code>post_id</code> = %d",$id));
}

/**
 * Delete term
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_delete_term($id) {

	$table = get_option('custom_permalink_table');
	if ( $table )
	foreach ( $table as $link => $info ) {
		if ( $info['id'] == $id ) {
			unset($table[$link]);
			break;
		}
	}

	update_option('custom_permalink_table', $table);
}

/**
 * Options page
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_options_page() {

	// Handle revert
	if ( isset($_REQUEST['revertit']) && isset($_REQUEST['revert']) ) {
		check_admin_referer('custom-permalinks-bulk');
		foreach ( (array)$_REQUEST['revert'] as $identifier ) {
			list($kind, $id) = explode('.', $identifier);
			switch ( $kind ) {
				case 'post':
				case 'page':
					delete_post_meta( $id, 'custom_permalink' );
					break;
				case 'tag':
				case 'category':
					custom_permalinks_delete_term($id);
					break;
			}
		}

		// Redirect
		$redirectUrl = $_SERVER['REQUEST_URI'];
		?>
		<script type="text/javascript">
		document.location = '<?php echo $redirectUrl ?>'
		</script>
		<?php ;
	}

	?>
	<div class="wrap">
	<h2><?php _e('Custom Permalinks', 'custom-permalinks') ?></h2>

	<form method="post" action="<?php echo $_SERVER['REQUEST_URI'] ?>">
	<?php wp_nonce_field('custom-permalinks-bulk') ?>

	<div class="tablenav">
	<div class="alignleft">
	<input type="submit" value="<?php _e('Revert', 'custom-permalinks'); ?>" name="revertit" class="button-secondary delete" />
	</div>
	<br class="clear" />
	</div>
	<br class="clear" />
	<table class="widefat">
		<thead>
		<tr>
			<th scope="col" class="check-column"><input type="checkbox" /></th>
			<th scope="col"><?php _e('Title', 'custom-permalinks') ?></th>
			<th scope="col"><?php _e('Type', 'custom-permalinks') ?></th>
			<th scope="col"><?php _e('Permalink', 'custom-permalinks') ?></th>
		</tr>
		</thead>
		<tbody>
	<?php
	$rows = custom_permalinks_admin_rows();
	foreach ( $rows as $row ) {
		?>
		<tr valign="top">
		<th scope="row" class="check-column"><input type="checkbox" name="revert[]" value="<?php echo $row['id'] ?>" /></th>
		<td><strong><a class="row-title" href="<?php echo htmlspecialchars($row['editlink']) ?>"><?php echo htmlspecialchars($row['title']) ?></a></strong></td>
		<td><?php echo htmlspecialchars($row['type']) ?></td>
		<td><a href="<?php echo $row['permalink'] ?>" target="_blank" title="Visit <?php echo htmlspecialchars($row['title']) ?>">
			<?php echo htmlspecialchars(urldecode($row['permalink'])) ?>
			</a>
		</td>
		</tr>
		<?php
	}
	?>
	</tbody>
	</table>
	</form>
	</div>
	<?php
}

/**
 * Get rows for management view
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_admin_rows() {
	$rows = array();

	// List tags/categories
	$table = get_option('custom_permalink_table');
	if ( $table && is_array($table) ) {
		foreach ( $table as $permalink => $info ) {
			$row = array();
			$term = get_term($info['id'], ($info['kind'] == 'tag' ? 'post_tag' : 'category'));
			$row['id'] = $info['kind'].'.'.$info['id'];
			$row['permalink'] = home_url()."/".$permalink;
			$row['type'] = ucwords($info['kind']);
			$row['title'] = $term->name;
			$row['editlink'] = ( $info['kind'] == 'tag' ? 'edit-tags.php?action=edit&taxonomy=post_tag&tag_ID='.$info['id'] : 'edit-tags.php?action=edit&taxonomy=category&tag_ID='.$info['id'] );
			$rows[] = $row;
		}
	}

	// List posts/pages
	global $wpdb;
	$query = "SELECT $wpdb->posts.* FROM $wpdb->posts LEFT JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id) WHERE
	 		$wpdb->postmeta.meta_key = 'custom_permalink' AND $wpdb->postmeta.meta_value != '';";
	$posts = $wpdb->get_results($query);
	foreach ( $posts as $post ) {
		$row = array();
		$row['id'] = 'post.'.$post->ID;
		$row['permalink'] = get_permalink($post->ID);
		$row['type'] = ucwords( $post->post_type );
		$row['title'] = $post->post_title;
		$row['editlink'] = 'post.php?action=edit&post='.$post->ID;
		$rows[] = $row;
	}

	return $rows;
}

/**
 * Get original permalink for post
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_original_post_link($post_id) {
	remove_filter( 'post_link', 'custom_permalinks_post_link', 10, 2 ); // original hook
	remove_filter( 'post_type_link', 'custom_permalinks_post_link', 10, 2 );
	$originalPermalink = ltrim(str_replace(home_url(), '', get_permalink( $post_id )), '/');
	add_filter( 'post_link', 'custom_permalinks_post_link', 10, 2 ); // original hook
	add_filter( 'post_type_link', 'custom_permalinks_post_link', 10, 2 );
	return $originalPermalink;
}

/**
 * Get original permalink for page
 *
 * @package CustomPermalinks
 * @since 0.4
 */
function custom_permalinks_original_page_link($post_id) {
	remove_filter( 'page_link', 'custom_permalinks_page_link', 10, 2 );
	remove_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	$originalPermalink = ltrim(str_replace(home_url(), '', get_permalink( $post_id )), '/');
	add_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	add_filter( 'page_link', 'custom_permalinks_page_link', 10, 2 );
	return $originalPermalink;
}

/**
 * Get original permalink for tag
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_original_tag_link($tag_id) {
	remove_filter( 'tag_link', 'custom_permalinks_term_link', 10, 2 );
	remove_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	$originalPermalink = ltrim(str_replace(home_url(), '', get_tag_link($tag_id)), '/');
	add_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	add_filter( 'tag_link', 'custom_permalinks_term_link', 10, 2 );
	return $originalPermalink;
}

/**
 * Get original permalink for category
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_original_category_link($category_id) {
	remove_filter( 'category_link', 'custom_permalinks_term_link', 10, 2 );
	remove_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	$originalPermalink = ltrim(str_replace(home_url(), '', get_category_link($category_id)), '/');
	add_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );
	add_filter( 'category_link', 'custom_permalinks_term_link', 10, 2 );
	return $originalPermalink;
}

/**
 * Get permalink for term
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_permalink_for_term($id) {
	$table = get_option('custom_permalink_table');
	if ( $table )
	foreach ( $table as $link => $info ) {
		if ( $info['id'] == $id ) {
			return $link;
		}
	}
	return false;
}

/**
 * Set up administration
 *
 * @package CustomPermalinks
 * @since 0.1
 */
function custom_permalinks_setup_admin() {
	add_management_page( 'Custom Permalinks', 'Custom Permalinks', 5, 'custom_permalinks', 'custom_permalinks_options_page' );
	if ( is_admin() )
		wp_enqueue_script('admin-forms');
}

# Check whether we're running within the WP environment, to avoid showing errors like
# "Fatal error: Call to undefined function get_bloginfo() in C:\xampp\htdocs\custom-permalinks\custom-permalinks.php on line 753"
# and similar errors that occurs when the script is called directly to e.g. find out the full path.

if (function_exists("add_action") && function_exists("add_filter")) {
	add_action( 'template_redirect', 'custom_permalinks_redirect', 5 );
	add_filter( 'post_link', 'custom_permalinks_post_link', 10, 2 );
	add_filter( 'post_type_link', 'custom_permalinks_post_link', 10, 2 );
	add_filter( 'page_link', 'custom_permalinks_page_link', 10, 2 );
	add_filter( 'tag_link', 'custom_permalinks_term_link', 10, 2 );
	add_filter( 'category_link', 'custom_permalinks_term_link', 10, 2 );
	add_filter( 'request', 'custom_permalinks_request', 10, 1 );
	add_filter( 'user_trailingslashit', 'custom_permalinks_trailingslash', 10, 2 );

	if (function_exists("get_bloginfo")) {
		$v = explode('.', get_bloginfo('version'));
	}

	if ( $v[0] >= 2 ) {
	    add_filter( 'get_sample_permalink_html', 'custom_permalink_get_sample_permalink_html', 10, 4 );
	} else {
	    add_action( 'edit_form_advanced', 'custom_permalinks_post_options' );
	    add_action( 'edit_page_form', 'custom_permalinks_page_options' );
	}

	add_action( 'edit_tag_form', 'custom_permalinks_term_options' );
	add_action( 'add_tag_form', 'custom_permalinks_term_options' );
	add_action( 'edit_category_form', 'custom_permalinks_term_options' );
	add_action( 'save_post', 'custom_permalinks_save_post' );
	add_action( 'save_page', 'custom_permalinks_save_post' );
	add_action( 'edited_post_tag', 'custom_permalinks_save_tag' );
	add_action( 'edited_category', 'custom_permalinks_save_category' );
	add_action( 'create_post_tag', 'custom_permalinks_save_tag' );
	add_action( 'create_category', 'custom_permalinks_save_category' );
	add_action( 'delete_post', 'custom_permalinks_delete_permalink', 10);
	add_action( 'delete_post_tag', 'custom_permalinks_delete_term' );
	add_action( 'delete_post_category', 'custom_permalinks_delete_term' );
	add_action( 'admin_menu', 'custom_permalinks_setup_admin' );
}
?>
https://wordpress.org/plugins/custom-permalinks/
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