function file_stream_wrapper_valid_scheme

Checks that the scheme of a stream URI is valid.

Confirms that there is a registered stream handler for the provided scheme and that it is callable. This is useful if you want to confirm a valid scheme without creating a new instance of the registered handler.

Parameters

$scheme: A URI scheme, a stream is referenced as "scheme://target".

Return value

Returns TRUE if the string is the name of a validated stream, or FALSE if the scheme does not have a registered handler.

Related topics

File

includes/file.inc, line 225

Code

function file_stream_wrapper_valid_scheme($scheme) {
    // Does the scheme have a registered handler that is callable?
    $class = file_stream_wrapper_get_class($scheme);
    if (class_exists($class)) {
        return TRUE;
    }
    else {
        return FALSE;
    }
}