wp-chinese-converter/wpcs-wp-super-cache-plugin.php

<?php

/**
*wp super cache plugin. Add basic compability with "php cache" mode of wp super cache plugin. Experimental!
*
*Don't edit this file manully.
*
*@since 1.1.11
*
*/

$GLOBALS['wp_supercache_wpcs_version'] = '1.0';

function wp_supercache_wpcs_get_prefered_language($accept_languages, $target_langs, $flag = 0) {
	$langs = array();
	preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $accept_languages, $lang_parse);

	if(count($lang_parse[1])) {
		$langs = array_combine($lang_parse[1], $lang_parse[4]);//array_combine需要php5以上版本
		foreach($langs as $lang => $val) {
			if($val === '') $langs[$lang] = '1';
		}
	arsort($langs, SORT_NUMERIC);
	$langs = array_keys($langs);
	$langs = array_map('strtolower', $langs);

		foreach($langs as $val) {
			if(in_array($val, $target_langs))
				return $val;
		}

		if( $flag ) {
			$array = array('zh-hans', 'zh-cn', 'zh-sg', 'zh-my');
			$a = array_intersect($array, $target_langs);
			if(!empty($a)) {
				$b = array_intersect($array, $langs);
				if(!empty($b)) {
					$a = each($a);
					return $a[1];
				}
			}

			$array = array('zh-hant', 'zh-tw', 'zh-hk', 'zh-mo');
			$a = array_intersect($array, $target_langs);
			if(!empty($a)) {
				$b = array_intersect($array, $langs);
				if(!empty($b)) {
					$a = each($a);
					return $a[1];
				}
			}
		}
		return 'null';
	}
	return 'null';
}

function wp_supercache_wpcs_admin() {
	$id = 'wpcs-section';
	?>
		<fieldset id="<?php echo $id; ?>" class="options">
		<h4>WP Chinese Switcher</h4>
		<p>Wp super cache - WP Chinese Switcher plugin is activated. To uninstall it, go to WP Chinese Switcher plugin setting page.</p>
	</fieldset>
	<?php
}
add_cacheaction( 'cache_admin_page', 'wp_supercache_wpcs_admin' );

function wp_supercache_wpcs_cache_key($cachekey) {
	global $wpcs_options;

	$browser_lang = wp_supercache_wpcs_get_prefered_language($_SERVER['HTTP_ACCEPT_LANGUAGE'], $wpcs_options['wpcs_used_langs'], $wpcs_options['wpcs_auto_language_recong']);

	$cookie_lang = 'null';
	foreach( $_COOKIE as $key => $val ) {
		if ( preg_match( "/^wpcs_variant_/", $key ) ) {
			$cookie_lang = $val;
			break;
		}
	}

	$is_redirect = 'direct';
	foreach( $_COOKIE as $key => $val ) {
		if ( preg_match( "/^wpcs_is_redirect_/", $key ) ) {
			$is_redirect = 'redirect';
			break;
		}
	}

	return $cachekey . '_' . $browser_lang . '_' . $cookie_lang . '_' . $is_redirect;
}
add_cacheaction('wp_cache_key', 'wp_supercache_wpcs_cache_key');