XAMMP 1.7 の頃は php_apc モジュールが標準で入っていましたが、XAMPP 1.8.2 では含まれていません。
使えるモジュールが無いかググったところ、以下のものが使えました。
http://belsky.info/uploads/my/bugz/61984/php_apc-3.1.10-5.4-vc9-x86-xp.zip
インストール方法
extension=php_apc.dll [APC] apc.enabled = 1 apc.shm_size = 32M apc.ttl = 0 apc.user_ttl = 0 apc.gc_ttl = 3600 apc.stat = 1
C:\>php -i | find "apc" apc apc.cache_by_default => On => On apc.canonicalize => On => On apc.coredump_unmap => Off => Off apc.enable_cli => Off => Off apc.enabled => On => On apc.file_md5 => Off => Off apc.file_update_protection => 2 => 2 apc.filters => no value => no value apc.gc_ttl => 3600 => 3600 apc.include_once_override => Off => Off apc.lazy_classes => Off => Off apc.lazy_functions => Off => Off apc.max_file_size => 1M => 1M apc.num_files_hint => 1000 => 1000 apc.preload_path => no value => no value apc.report_autofilter => Off => Off apc.rfc1867 => Off => Off apc.rfc1867_freq => 0 => 0 apc.rfc1867_name => APC_UPLOAD_PROGRESS => APC_UPLOAD_PROGRESS apc.rfc1867_prefix => upload_ => upload_ apc.rfc1867_ttl => 3600 => 3600 apc.serializer => default => default apc.shm_segments => 1 => 1 apc.shm_size => 32M => 32M apc.shm_strings_buffer => 4M => 4M apc.slam_defense => On => On apc.stat => On => On apc.stat_ctime => Off => Off apc.ttl => 0 => 0 apc.use_request_time => On => On apc.user_entries_hint => 4096 => 4096 apc.user_ttl => 0 => 0 apc.write_lock => On => On