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Get the error message for the occurred error.
Syntax Syntax
Return Return
(string|array) Error message, or array of messages for multifeeds
Source Source
File: wp-includes/class-simplepie.php
elseif ($cache->mtime() + $this->cache_duration < time())
{
// Want to know if we tried to send last-modified and/or etag headers
// when requesting this file. (Note that it's up to the file to