Description:
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The default bahavior auf fgetcsv() is, if no parameter but the first is given, that it automatically adjusts the buffer size when reading the stream. Internally this is done by setting length to -1.

However, when you start to provide a custom delimiter or enclosure, you also have to specify the length. It is not possible to set length to -1 (the C code prevents this), therefore the feature that the buffer adjusts its size automatically cannot be used.

This is pretty much the same http://php.net/preg_split handles 
limit and flags parameter. If you want to specify "flags" but no "limit", you set limit to -1.

This should be possible for fgetcsv() too.