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_translate_php_url_constant_to_key( int $constant )

Translate a PHP_URL_* constant to the named array keys PHP uses.

Parameters

$constant

(Required) PHP*URL** constant.

Return

(string|bool) The named key or false.

Source

File: wp-includes/http.php 

function _wp_translate_php_url_constant_to_key( $constant ) {
	$translation = array(
		PHP_URL_SCHEME   => 'scheme',
		PHP_URL_HOST     => 'host',
		PHP_URL_PORT     => 'port',
		PHP_URL_USER     => 'user',
		PHP_URL_PASS     => 'pass',
		PHP_URL_PATH     => 'path',
		PHP_URL_QUERY    => 'query',
		PHP_URL_FRAGMENT => 'fragment',
	);

	if ( isset( $translation[ $constant ] ) ) {
		return $translation[ $constant ];
	} else {
		return false;
	}
}

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Changelog
Version Description
WP-4.7.0 Introduced.