is_ssl()

Determines if SSL is used.

Return

(bool) True if SSL, otherwise false.

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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Related

Used By

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

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

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wp-includes/pluggable.php: auth_redirect()

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

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wp-includes/class-wp-admin-bar.php: WP_Admin_Bar::__get()
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wp-includes/link-template.php: network_home_url()

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

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

Authenticates and logs a user in with ‘remember’ capability.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::get_allowed_urls()

Get URLs allowed to be previewed.
wp-includes/canonical.php: redirect_canonical()

Redirects incoming links to the proper URL based on the site url.
wp-includes/rest-api.php: get_rest_url()

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

Retrieve the URL for an attachment.
wp-includes/ms-functions.php: filter_SSL()

Formats a URL to use https.
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.
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Display plugin information in dialog box form.
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()
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Changelog

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