is_ssl()

Determines if SSL is used.

Description

Return

(bool) True if SSL, otherwise false.

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Source

File: wp-includes/load.php 

function is_ssl() {
	if ( isset( $_SERVER['HTTPS'] ) ) {
		if ( 'on' == strtolower( $_SERVER['HTTPS'] ) ) {
			return true;
		}

		if ( '1' == $_SERVER['HTTPS'] ) {
			return true;
		}
	} elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
		return true;
	}
	return false;
}

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Changelog

Version Description
4.6.0 Moved from functions.php to load.php.
2.6.0 Introduced.

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Used By

Used By Description
wp-includes/class-wp-recovery-mode.php: WP_Recovery_Mode::redirect_protected()

Redirects the current request to allow recovering multiple errors in one go.
wp-includes/class-wp-recovery-mode-cookie-service.php: WP_Recovery_Mode_Cookie_Service::set_cookie()

Sets the recovery mode cookie.
wp-admin/includes/class-wp-debug-data.php: WP_Debug_Data::debug_data()

Static function for generating site debug data when required.
wp-admin/includes/class-wp-site-health.php: WP_Site_Health::get_test_https_status()

Test if your site is serving content over HTTPS.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::get_allowed_urls()

Get URLs allowed to be previewed.
wp-includes/ms-load.php: ms_load_current_site_and_network()

Identifies the network and site of a requested domain and path and populates the corresponding network and site global objects as part of the multisite bootstrap process.
wp-includes/rest-api.php: get_rest_url()

Retrieves the URL to a REST endpoint on a site.
wp-includes/media.php: wp_calculate_image_srcset()

A helper function to calculate the image sources to include in a ‘srcset’ attribute.
wp-includes/admin-bar.php: wp_admin_bar_customize_menu()

Adds the “Customize” link to the Toolbar.
wp-includes/link-template.php: get_avatar_data()

Retrieves default data about the avatar.
wp-admin/includes/ajax-actions.php: wp_ajax_parse_embed()

Apply [embed] Ajax handlers to a string.
wp-admin/includes/dashboard.php: wp_dashboard_browser_nag()
wp-includes/pluggable.php: wp_parse_auth_cookie()

Parses a cookie into its components.
wp-includes/pluggable.php: wp_set_auth_cookie()

Sets the authentication cookies based on user ID.
wp-includes/pluggable.php: auth_redirect()

Checks if a user is logged in, if not it redirects them to the login page.
wp-includes/general-template.php: wp_login_form()

Provides a simple login form for use anywhere within WordPress.
wp-includes/functions.php: wp_auth_check_html()

Output the HTML that shows the wp-login dialog when the user is no longer logged in.
wp-includes/functions.php: wp_guess_url()

Guess the URL for the site.
wp-includes/link-template.php: set_url_scheme()

Sets the scheme for a URL.
wp-includes/link-template.php: network_home_url()

Retrieves the home URL for the current network.
wp-includes/link-template.php: get_home_url()

Retrieves the URL for a given site where the front end is accessible.
wp-includes/class-wp-admin-bar.php: WP_Admin_Bar::__get()
wp-includes/user.php: wp_signon()

Authenticates and logs a user in with ‘remember’ capability.
wp-includes/post.php: wp_get_attachment_url()

Retrieve the URL for an attachment.
wp-includes/canonical.php: redirect_canonical()

Redirects incoming links to the proper URL based on the site url.
wp-includes/ms-functions.php: filter_SSL()

Formats a URL to use https.