wp_is_internal_link( string $link )

Determines whether or not the specified URL is of a host included in the internal hosts list.

Description

See also

Parameters

$link

(Required) The URL to test.

Return

(bool) Returns true for internal URLs and false for all other URLs.

Source

File: wp-includes/link-template.php 

function wp_is_internal_link( $link ) {
	$link = strtolower( $link );
	if ( in_array( wp_parse_url( $link, PHP_URL_SCHEME ), wp_allowed_protocols(), true ) ) {
		return in_array( wp_parse_url( $link, PHP_URL_HOST ), wp_internal_hosts(), true );
	}
	return false;
}

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Related

Uses

Uses
Uses Description
wp-includes/link-template.php: wp_internal_hosts()

Returns an array of URL hosts which are considered to be internal hosts.
wp-includes/http.php: wp_parse_url()

A wrapper for PHP’s parse_url() function that handles consistency in the return values across PHP versions.

Changelog

Changelog
Version Description
6.2.0 Introduced.