WordPress at a glance
function is not described

wp_is_stream() WP 3.5.0

Test if a given path is a stream URL

No Hooks.

Return

true/false. True if the path is a stream URL.

Usage

wp_is_stream( $path );
$path(string) (required)
The resource path or URL.

Code of wp is stream: wp-includes/functions.php VER 5.0.3

<?php
function wp_is_stream( $path ) {
	if ( false === strpos( $path, '://' ) ) {
		// $path isn't a stream
		return false;
	}

	$wrappers    = stream_get_wrappers();
	$wrappers    = array_map( 'preg_quote', $wrappers );
	$wrappers_re = '(' . join( '|', $wrappers ) . ')';

	return preg_match( "!^$wrappers_re://!", $path ) === 1;
}