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PHP version: works with all PHP versions including PHP5.2
Status: stable, actively maintained. Will be included in the core of PHP 6.
Download link: http://pecl.php.net/package/APC (*nix)
Download link for Windows: http://pecl4win.php.net/ext.php/php_apc.dll (oldest, buggy, 3.0.16), and in latest compiled pecl snaphot – http://snaps.php.net/
Official installation help: inside the source
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