Enable 0 mode for echo/print

Author: Yasuo Ohgaki

main/main.c

@@ -131,7 +131,7 @@ static PHP_INI_MH(OnSetPrecision)
 	zend_long i;
 
 	ZEND_ATOL(i, ZSTR_VAL(new_value));
-	if (i >= 0) {
+	if (i >= -1) {
 		EG(precision) = i;
 		return SUCCESS;
 	} else {

main/spprintf.c

@@ -306,8 +306,8 @@ static void xbuf_format_converter(void *xbuf, zend_bool is_char, const char *fmt
 					} else if (*fmt == '*') {
 						precision = va_arg(ap, int);
 						fmt++;
-						if (precision < 0)
-							precision = 0;
+						if (precision < -1)
+							precision = -1;
 					} else
 						precision = 0;