Description:
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http://www.php.net/manual/en/function.crypt.php

I understand that crypt() must not be binary safe in order to maintain 
compatibility with other implementations, but it should be clearly stated in the 
crypt() documentation, since it might lead to unexpected results (for example, 
when feeding raw bytes directly into crypt()).

Test script:
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For example, this two lines generate the same output, which is correct, but can be confusing:

echo crypt("aaa", '$2a$07$usesomesillystringforsalt$');
echo crypt("aaa\x00aa", '$2a$07$usesomesillystringforsalt$');