Description:
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in the file $PHP_PREFIX/include/php/ext/standard/php_smart_str.h ,line 52, 
should have a pointer conversion.

now the code is below:

#define SMART_STR_DO_REALLOC(d, what) \
        (d)->c = SMART_STR_REALLOC((d)->c, (d)->a + 1, (what))

but any extensions include it cann't be compiled before change the code above 
like this, no matter the compiler is visual studio(2005 or 2008) or gcc:

#define SMART_STR_DO_REALLOC(d, what) \
        (d)->c = (char*) SMART_STR_REALLOC((d)->c, (d)->a + 1, (what))

everytime I change it myself.But event the newest PHP 5.3.6, the pointer 
conversion is still absent.