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<?php 
/*  
Template Name: CAUTION - Bulk Update Page Slugs
    
	SECURITY FEATURE: Will only update pages with a given author!
	1. Create a new user with username "bulkupdater".
	2. Assign all pages you need to update to author bulkupdater.
	3. Create a new page, assign this template and open it in the browser.
	4. You'll see a preview of what's going to happen.
	5. Set $update_slugs_now to true and relaod the page in your browser to perform the update.
	
	Based upon a solution by Jan Beck: http://stackoverflow.com/a/11751432
*/

// Set this to true to perform the update. Have you checked the name scheme in line 39?
$update_slugs_now = false;

// Query pages 
$pages = get_posts( array(
	'post_type' => 'page', 
	'posts_per_page' => -1,
	'author_name' => 'bulkupdater'
) );

// Stop if query is empty.
if( empty( $pages ) ) :
	echo 'Nothing to update';
	exit;
endif;

// Info message
echo ( true == $update_slugs_now ) ? '<p><strong>Update performed!</strong</p>' : '<p><strong>This is a preview. Go for it? Set <code>$update_slugs_now</code> to <code>true</code> and reload this page.</strong></p>';

// Set a counter
$i = 1;

// Loop through queried pages
foreach ( $pages as $page ) :
	
	// Store for later
	$old = $page->post_name;
	
	// Define your name scheme here!
	// The below scheme results in URLs like:
	// http://example.com/mypage-updated-1
	$post_name = sprintf( '%1$s-%2$s-%3$s',
					$old, // the old page slug
					'updated', // a custom text string
					$i // the counter
					);
	
	$new = array();
	$new['ID'] = $page->ID;
	$new['post_name'] = $post_name;
	
	$updated = 'Going to update';
 	
 	// Update existing posts
 	if( true == $update_slugs_now ) :
 		$updated = 'Updated';
 		wp_update_post( $new );
 	endif;
 	
 	printf( '%1$s <em>%2$s</em> to <strong>%3$s</strong>.<br />', $updated, $old, $new['post_name'] );
 	
 	// Update counter
	$i++;
	
endforeach;