Hi,

If I call the internal (string.c) php_str_to_str function 

PHPAPI char *php_str_to_str(char *haystack, int length, 
        char *needle, int needle_len, char *str, int str_len, int
*_new_length)

with an empty haystack string (""), it returns NULL instead of an empty
(smart_)string.
This could be solved by initializing the smart_str result with an empty
string in stead of with {0}.

Cheerio, Marc.

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