different versions of php, php-5.2.13-i486-2 "slackware-stable" and php-5.3.6-i486-1 "slackware-current", why dbase.so and mhash.so not in the version of php-5.3. 6-i486-1? see the differences below

php-5.2.13-i486-2
ls -all /usr/lib/php/extensions/
total 3892
drwxr-xr-x 2 root root 4096 Mar 18 08:47 ./
drwxr-xr-x 14 root root 4096 Mar 18 08:35 ../
-rwxr-xr-x 1 root root 29408 Mar 18 08:47 bcmath.so*
-rwxr-xr-x 1 root root 19176 Mar 18 08:47 bz2.so*
-rwxr-xr-x 1 root root 24688 Mar 18 08:47 calendar.so*
-rwxr-xr-x 1 root root 9172 Mar 18 08:47 ctype.so*
-rwxr-xr-x 1 root root 57100 Mar 18 08:47 curl.so*
-rwxr-xr-x 1 root root 49172 Mar 18 08:47 dba.so*
-rwxr-xr-x 1 root root 27700 Mar 18 08:47 dbase.so*
-rwxr-xr-x 1 root root 48120 Mar 18 08:47 exif.so*
-rwxr-xr-x 1 root root 43764 Mar 18 08:47 ftp.so*
-rwxr-xr-x 1 root root 360504 Mar 18 08:47 gd.so*
-rwxr-xr-x 1 root root 8684 Mar 18 08:47 gettext.so*
-rwxr-xr-x 1 root root 40884 Mar 18 08:47 gmp.so*
-rwxr-xr-x 1 root root 32676 Mar 18 08:47 iconv.so*
-rwxr-xr-x 1 root root 39956 Mar 18 08:47 ldap.so*
-rwxr-xr-x 1 root root 1851176 Mar 18 08:47 mbstring.so*
-rwxr-xr-x 1 root root 6972 Mar 18 08:47 mhash.so*
-rwxr-xr-x 1 root root 44812 Mar 18 08:47 mysql.so*
-rwxr-xr-x 1 root root 102100 Mar 18 08:47 mysqli.so*
-rwxr-xr-x 1 root root 81640 Mar 18 08:47 openssl.so*
-rwxr-xr-x 1 root root 94192 Mar 18 08:47 pdo.so*
-rwxr-xr-x 1 root root 24400 Mar 18 08:47 pdo_mysql.so*
-rwxr-xr-x 1 root root 19472 Mar 18 08:47 pdo_sqlite.so*
-rwxr-xr-x 1 root root 20404 Mar 18 08:47 pspell.so*
-rwxr-xr-x 1 root root 7484 Mar 18 08:47 shmop.so*
-rwxr-xr-x 1 root root 23932 Mar 18 08:47 snmp.so*
-rwxr-xr-x 1 root root 315220 Mar 18 08:47 soap.so*
-rwxr-xr-x 1 root root 341712 Mar 18 08:47 sqlite.so*
-rwxr-xr-x 1 root root 13980 Mar 18 08:47 tokenizer.so*
-rwxr-xr-x 1 root root 30684 Mar 18 08:47 wddx.so*
-rwxr-xr-x 1 root root 24596 Mar 18 08:47 xsl.so*
-rwxr-xr-x 1 root root 65952 Mar 18 08:47 zip.so*
-rwxr-xr-x 1 root root 27368 Mar 18 08:47 zlib.so*

php-5.3.6-i486-1
ls -all /usr/lib/php/extensions/
total 4155
drwxr-xr-x 2 root root 912 Mar 18 02:18 .
drwxr-xr-x 14 root root 624 Mar 18 02:17 ..
-rwxr-xr-x 1 root root 23512 Mar 18 02:18 bcmath.so
-rwxr-xr-x 1 root root 19388 Mar 18 02:18 bz2.so
-rwxr-xr-x 1 root root 21424 Mar 18 02:18 calendar.so
-rwxr-xr-x 1 root root 9140 Mar 18 02:18 ctype.so
-rwxr-xr-x 1 root root 61376 Mar 18 02:18 curl.so
-rwxr-xr-x 1 root root 44964 Mar 18 02:18 dba.so
-rwxr-xr-x 1 root root 17556 Mar 18 02:18 enchant.so
-rwxr-xr-x 1 root root 47028 Mar 18 02:18 exif.so
-rwxr-xr-x 1 root root 40596 Mar 18 02:18 ftp.so
-rwxr-xr-x 1 root root 324176 Mar 18 02:18 gd.so
-rwxr-xr-x 1 root root 8340 Mar 18 02:18 gettext.so
-rwxr-xr-x 1 root root 39860 Mar 18 02:18 gmp.so
-rwxr-xr-x 1 root root 32164 Mar 18 02:18 iconv.so
-rwxr-xr-x 1 root root 39732 Mar 18 02:18 ldap.so
-rwxr-xr-x 1 root root 2007336 Mar 18 02:18 mbstring.so
-rwxr-xr-x 1 root root 36532 Mar 18 02:18 mysql.so
-rwxr-xr-x 1 root root 99304 Mar 18 02:18 mysqli.so
-rwxr-xr-x 1 root root 103132 Mar 18 02:18 openssl.so
-rwxr-xr-x 1 root root 86000 Mar 18 02:18 pdo.so
-rwxr-xr-x 1 root root 19396 Mar 18 02:18 pdo_mysql.so
-rwxr-xr-x 1 root root 19524 Mar 18 02:18 pdo_sqlite.so
-rwxr-xr-x 1 root root 241001 Oct 25 11:51 pgsql.so
-rwxr-xr-x 1 root root 16372 Mar 18 02:18 pspell.so
-rwxr-xr-x 1 root root 7700 Mar 18 02:18 shmop.so
-rwxr-xr-x 1 root root 22740 Mar 18 02:18 snmp.so
-rwxr-xr-x 1 root root 319464 Mar 18 02:18 soap.so
-rwxr-xr-x 1 root root 323504 Mar 18 02:18 sqlite.so
-rwxr-xr-x 1 root root 14164 Mar 18 02:18 tokenizer.so
-rwxr-xr-x 1 root root 29748 Mar 18 02:18 wddx.so
-rwxr-xr-x 1 root root 24212 Mar 18 02:18 xsl.so
-rwxr-xr-x 1 root root 71712 Mar 18 02:18 zip.so
-rwxr-xr-x 1 root root 28828 Mar 18 02:18 zlib.so

According to PHP Manual:

MHASH: This extension is obsoleted by Hash.
HASH is now part of PHP core, so it will be compiled anyway

As of DBASE: This extension has been moved to the » PECL repository and is no longer bundled with PHP as of PHP 5.3.0.