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// expires on: [cert_expire offset="+5 years" format="M j, Y"][courseinfo show="completed_on" format="Y-m-d"][/cert_expire]
add_shortcode('cert_expire', function($atts = array(), $content = '') {
if ( !empty( $content ) ) {
// We call do_shortcode to have LD process the inner shortcode [courseinfo] section.
$content = do_shortcode( $content );
if ( !empty( $content ) ) {
// the returned value should be YYYY-MM-DD as per the inner shortcode courseinfo format
// so now we convert it to a timestamp and adjust per the offset.
$course_completed_on_timestamp = strtotime( $atts['offset'], strtotime( $content ) );
// The taking that adjusted timestamp we now reformat per the cert_expire format
$content = date( $atts['format'], $course_completed_on_timestamp );
} else {
// If content is empty we set our return value to an empty string
$content = '';
}
} else {
// If content is empty we set our return value to an empty string
$content = '';
}
return $content;
});