Add comment to cache file driver.

5f0ffe13 · Taylor Otwell · 7e28433a · 5f0ffe13
Commit 5f0ffe13 authored Aug 02, 2011 by Taylor Otwell
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file.php system/cache/file.php +2 -0

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--- a/system/cache/file.php
+++ b/system/cache/file.php
@@ -29,6 +29,8 @@ class File implements Driver {
 		$cache = file_get_contents(CACHE_PATH.$key);
+		// The cache expiration date is stored as a UNIX timestamp at the beginning
+		// of the cache file. We'll extract it out and check it here.
 		if (time() >= substr($cache, 0, 10))
 		{
 			$this->forget($key);