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I'm using WordPress RSS Widget for one of my site. But found it's a bit lazy, it's not taking latest updates into the feed.

How can I make it quick in loading new updates?

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WordPress supports external feeds, and parse the feed using a function named fetch_feed() from SimplePie. RSS widget is one of them using the same function to fetch external feed.

The Codex says:

fetch_feed caches results for 12 hours by default.

So, the feed you are fetching is actually at least 12 hours old. But a good news is there also that, you can modify the duration of the fetching by using a filter: wp_feed_cache_transient_lifetime.

How to use that? Simple. Just paste the following code into your theme's functions.php:

add_filter( 'wp_feed_cache_transient_lifetime', function(){ return 1800; });

Here,
we are using the filter to modify the duration. Here we are passing our new duration with 1800 [seconds]. The calculation is: 30 minutes = 30 min. x 60 sec. = 1800 sec.

Using the simple code you can change the duration.

Source:

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    Please do not use create_function(). It is very slow and hard to read. Use either real lambdas or regular named functions.
    – fuxia ♦
    Commented Mar 20, 2014 at 7:15
  • @toscho: Thanks for the suggestion. I changed it to lambda (it's a new term to me though). Is it correct now? Love to learn more. :)
    – Mayeenul Islam
    Commented Mar 20, 2014 at 10:32
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    Lambda would look like this: add_filter( 'wp_feed_cache_transient_lifetime', function(){ return 1800; });.
    – fuxia ♦
    Commented Mar 20, 2014 at 11:24

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