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;