This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
WP_Site_Health::check_for_page_caching()
Checks if site has page cache enabled or not.
Return
(WP_Error|array) Page cache detection details or else error information.<br>
- 'advanced_cache_present'
(bool) Whether a page cache plugin is present.<br> - 'page_caching_response_headers'
(array[]) Sets of client caching headers for the responses.<br> - 'response_timing'
(float[]) Response timings.<br>
Source
File: wp-admin/includes/class-wp-site-health.php
private function check_for_page_caching() {
/** This filter is documented in wp-includes/class-wp-http-streams.php */
$sslverify = apply_filters( 'https_local_ssl_verify', false );
$headers = array();
// Include basic auth in loopback requests. Note that this will only pass along basic auth when user is
// initiating the test. If a site requires basic auth, the test will fail when it runs in WP Cron as part of
// wp_site_health_scheduled_check. This logic is copied from WP_Site_Health::can_perform_loopback().
if ( isset( $_SERVER['PHP_AUTH_USER'] ) && isset( $_SERVER['PHP_AUTH_PW'] ) ) {
$headers['Authorization'] = 'Basic ' . base64_encode( wp_unslash( $_SERVER['PHP_AUTH_USER'] ) . ':' . wp_unslash( $_SERVER['PHP_AUTH_PW'] ) );
}
$caching_headers = $this->get_page_cache_headers();
$page_caching_response_headers = array();
$response_timing = array();
for ( $i = 1; $i <= 3; $i++ ) {
$start_time = microtime( true );
$http_response = wp_remote_get( home_url( '/' ), compact( 'sslverify', 'headers' ) );
$end_time = microtime( true );
if ( is_wp_error( $http_response ) ) {
return $http_response;
}
if ( wp_remote_retrieve_response_code( $http_response ) !== 200 ) {
return new WP_Error(
'http_' . wp_remote_retrieve_response_code( $http_response ),
wp_remote_retrieve_response_message( $http_response )
);
}
$response_headers = array();
foreach ( $caching_headers as $header => $callback ) {
$header_values = wp_remote_retrieve_header( $http_response, $header );
if ( empty( $header_values ) ) {
continue;
}
$header_values = (array) $header_values;
if ( empty( $callback ) || ( is_callable( $callback ) && count( array_filter( $header_values, $callback ) ) > 0 ) ) {
$response_headers[ $header ] = $header_values;
}
}
$page_caching_response_headers[] = $response_headers;
$response_timing[] = ( $end_time - $start_time ) * 1000;
}
return array(
'advanced_cache_present' => (
file_exists( WP_CONTENT_DIR . '/advanced-cache.php' )
&&
( defined( 'WP_CACHE' ) && WP_CACHE )
&&
/** This filter is documented in wp-settings.php */
apply_filters( 'enable_loading_advanced_cache_dropin', true )
),
'page_caching_response_headers' => $page_caching_response_headers,
'response_timing' => $response_timing,
);
}
Changelog
Version | Description |
---|---|
6.1.0 | Introduced. |