Caching by user agent

You should create WPSC plugin which can create separate cache file (wp-cache instead of super-cache file in this case) based on user agent. Also, you should set “Simple” instead of “Expert” delivery method.

Regarding to WPSC plugin, you need to add cache action (filter) wp_cache_key which should be unique ‘key’ for cache file. Something like this:

add_cacheaction( 'wp_cache_key', 'my_custom_ua_key' );

function my_custom_ua_key( $key ) {
	if ( ! empty($_SERVER['HTTP_USER_AGENT']) && stripos( $_SERVER['HTTP_USER_AGENT'], 'safari' ) !== false ) {
		$key .= 'safari';
		$super_cache_enabled = false; // Use wp-cache file.
	}

	return $key;
}

It can’t be added in plugins or theme because it should be executed early before loading plugins. You can read more on https://odd.blog/2017/10/25/writing-wp-super-cache-plugins/.

Heya

Many thanks for your reply (and so quickly, too!). That sounds like it could do the job, I’ll give it a try as soon as I can and let you know how it went.

Cheers

Hello

Thanks again. I have tried but I have had to tweak it a bit to get it to work. In particular, when the cache file didn’t exist, it would attempt to use the supercache_filename_str filter hook to generate the file name to be used. I have tested this on a number of browsers (Chrome, Ie, Safari) and seems to work alright. If you do have any feedback on the below, that would be much appreciated! I saved the below in wp-contents/plugins/wp-super-cache-plugins/caching-by-user-agent.php which did the trick.

<?php

add_filter( 'supercache_filename_str', 'my_custom_ua_key' );

function my_custom_ua_key($key) {
	global $is_safari, $is_chrome, $is_IE;

	if ( isset( $is_safari) && $is_safari ) {
		$key .= '-safari';
	} elseif ( isset( $is_chrome) && $is_chrome ) {
		$key .= '-chrome';
	} elseif ( isset( $is_chrome) && $is_IE ) {
		$key .= '-ie';
	}

	return $key;
}