Your IP : 216.73.216.171
<?php
defined( 'ABSPATH' ) or die( 'Cheatin’ uh?' );
/**
* Launch DNS Prefetching process
*
* @since 2.8.9 Use the wp_resource_hints filter introduced in WP 4.6 if possible, fallback to rocket_buffer hook for previous versions
* @since 2.5 Don't add CNAMES if CDN is disabled HTTPS pages or on specific posts
* @since 2.1 Adding CNAMES fo CDN automatically in DNS Prefetch process
* @since 2.0
*/
if ( function_exists( 'wp_resource_hints' ) ) {
add_filter( 'wp_resource_hints', 'rocket_dns_prefetch', 10, 2 );
} else {
add_filter( 'rocket_buffer', 'rocket_dns_prefetch_buffer', 12 );
}
/**
* Adds domain names to the list of DNS Prefetch printed by wp_resource_hints
*
* @since 2.8.9
* @author Remy Perona
*
* @param Array $hints URLs to print for resource hints.
* @param String $relation_type The relation type the URL are printed for.
* @return Array URLs to print
*/
function rocket_dns_prefetch( $hints, $relation_type ) {
$domains = rocket_get_dns_prefetch_domains();
if ( (bool) $domains ) {
foreach ( $domains as $domain ) {
if ( 'dns-prefetch' === $relation_type ) {
$hints[] = $domain;
}
}
}
return $hints;
}
/**
* Inserts html code for domain names to DNS prefetch in the buffer before creating the cache file
*
* @since 2.0
* @author Jonathan Buttigieg
*
* @param String $buffer HTML content.
* @return String Updated buffer
*/
function rocket_dns_prefetch_buffer( $buffer ) {
$dns_link_tags = '';
$domains = rocket_get_dns_prefetch_domains();
if ( (bool) $domains ) {
foreach ( $domains as $domain ) {
$dns_link_tags .= '<link rel="dns-prefetch" href="' . esc_url( $domain ) . '" />';
}
}
$old_ie_conditional_tag = '';
/**
* Allow to print an empty IE conditional tag to speed up old IE versions to load CSS & JS files
*
* @since 2.6.5
*
* @param bool true will print the IE conditional tag
*/
if ( apply_filters( 'do_rocket_old_ie_prefetch_conditional_tag', true ) ) {
$old_ie_conditional_tag = '<!--[if IE]><![endif]-->';
}
// Insert all DNS prefecth tags in head.
$buffer = preg_replace( '/<head(.*)>/', '<head$1>' . $old_ie_conditional_tag . $dns_link_tags, $buffer, 1 );
return $buffer;
}