Changed functions

PHP Core

• debug_zval_dump() now prints "int" instead of "long", and "float" instead of "double"
• dirname() now optionally takes a second parameter, depth, to get the name of the directory depth levels up from the current directory.
• getrusage() is now supported on Windows.
• mktime() and gmmktime() functions no longer accept is_dst parameter.
• preg_replace() function no longer supports "\e" (PREG_REPLACE_EVAL). preg_replace_callback() should be used instead.
• setlocale() function no longer accepts category passed as string. LC_* constants must be used instead.
• exec(), system() and passthru() functions have NULL byte protection now.
• substr() now returns an empty string, if string is equal to start characters long.