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Array to string conversion notices

  • /wp-content/plugins/w3-total-cache/lib/W3/Cache.php on line 52

    It doesn’t seem to like this bit of code:

    function &instance($engine, $config = array()) {
    static $instances = array();

    $instance_key = sprintf(‘%s_%s’, $engine, md5(implode(”, $config)));

    if (!isset($instances[$instance_key])) {
    switch ($engine) {
    case W3TC_CACHE_MEMCACHED:
    require_once W3TC_LIB_W3_DIR . ‘/Cache/Memcached.php’;
    $instances[$instance_key] = & ne

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