Description:
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From the docs:

"On seriously malformed URLs, parse_url() may return FALSE. Otherwise an associative array is returned, whose components may be (at least one):"

However, in some cases it will return NULL as well. Actually, I am having a really hard time getting it to return FALSE. I am not sure it ever does. I know it will throw a warning at times. But, it does not even seem to do that on an empty string.

Test script:
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<?php

var_dump(parse_url("1,2,3,4", PHP_URL_QUERY));
var_dump(parse_url("1,2,3,4"));

?>

Expected result:
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The documentation should state that the function returns NULL when the 2nd parameter is used and the requested portion of the URL is not not set.

Actual result:
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The documentation makes no mention of the function ever returning NULL.