deleteImageMemcached.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class DeleteImageCache extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Delete image information from the cache";
                $this->addOption( 'sleep', 'How many seconds to sleep between deletions', true, true );
                $this->addOption( 'until', 'Timestamp to delete all entries prior to', true, true );
        }

        public function execute() {
                global $wgMemc;

                $until = preg_replace( "/[^\d]/", '', $this->getOption( 'until' ) );
                $sleep = (int)$this->getOption( 'sleep' ) * 1000; // milliseconds

                ini_set( 'display_errors', false );

                $dbr = wfGetDB( DB_SLAVE );

                $res = $dbr->select( 'image',
                        array( 'img_name' ),
                        array( "img_timestamp < {$until}" ),
                        __METHOD__
                );

                $i = 0;
                $total = $this->getImageCount();

                foreach ( $res as $row ) {
                        if ( $i % $this->report == 0 )
                                $this->output( sprintf( "%s: %13s done (%s)\n", wfWikiID(), "$i/$total", wfPercent( $i / $total * 100 ) ) );
                        $md5 = md5( $row->img_name );
                        $wgMemc->delete( wfMemcKey( 'Image', $md5 ) );

                        if ( $sleep != 0 )
                                usleep( $sleep );

                        ++$i;
                }
        }

        private function getImageCount() {
                $dbr = wfGetDB( DB_SLAVE );
                return $dbr->selectField( 'image', 'COUNT(*)', array(), __METHOD__ );
        }
}

$maintClass = "DeleteImageCache";
require_once( RUN_MAINTENANCE_IF_MAIN );