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Add a query string to the end of the theme's style.css when WordPress is loaded.
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<?php | |
/** | |
* Add a filter to stylesheet_uri, which appends a query string to it automagically. | |
*/ | |
add_filter('stylesheet_uri', 'zk_css_versioner'); | |
/** | |
* the goal of this method is to append a query string to the css url for the site. | |
* the query string currently is determined by the last time the css file was modified | |
* the theory is that if the file is modified, change the value of v=, which should | |
* force the CDN to pull a new version from the origin server. This could be a | |
* a hit on performance, not sure yet. Let's get it working first. | |
* | |
* @return string | |
*/ | |
function zk_css_versioner() { | |
$cssfile = get_stylesheet_directory() . "/style.css"; | |
$turi = get_template_directory_uri(); | |
if (file_exists($cssfile)) { | |
$cssuri = "$turi/style.css?v=" . filemtime($cssfile); | |
} | |
echo $cssuri; | |
} | |
?> |
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