Rpmphp-pdo reports libc. so.6.1 () (64bit) isneededbyphp-pdo-5.1.6-23.2.el5_3.ia64

Rpmphp-pdo reports libc. so.6.1 () (64bit) isneededbyphp-pdo-5.1.6-23.2.el5_3.ia64-Linux general technology-Linux technology and application information, the following is the details of reading. I am a newbie in linux. I want to configure php to connect to the mysql program as needed,
Run pm-qa | grep php and find that the system lacks php-mysql and php-pdo. Because the system cannot run yum online, the rmp package is downloaded.

An error occurred while installing the php-pdo-5.1.6-23.2.el5_3.ia64.rpm under redhat 5:
[Root @ localhost ~] # Rpm-ivh php-pdo-5.1.6-23.2.el5_3.ia64.rpm
Warning: php-pdo-5.1.6-23.2.el5_3.ia64.rpm: Header V3 DSA signature: NOKEY, key ID 1d1e034b
Error: Failed dependencies:
Libc. so.6.1 () (64bit) is needed by php-pdo-5.1.6-23.2.el5_3.ia64
Libc. so.6.1 (GLIBC_2.2) (64bit) is needed by php-pdo-5.1.6-23.2.el5_3.ia64
Libc. so.6.1 (GLIBC_2.3) (64bit) is needed by php-pdo-5.1.6-23.2.el5_3.ia64

------------------ PHP Module Directory
Extension_dir = "/usr/lib64/php/modules" in php. ini"

---------------------- Search for glibc
[Root @ localhost ~] # Rpm-qa | grep glibc
Glibc-headers-2.5-42
Compat-glibc-2.3.4-2.26
Glibc-devel-2.5-42
Compat-glibc-headers-2.3.4-2.26
Glibc-common-2.5-42
Glibc-2.5-42
Compat-glibc-2.3.4-2.26
Glibc-devel-2.5-42
Glibc-2.5-42

I have worked overtime on weekends for two nights. Please help me analyze the cause and inform me of the solution. Thank you very much.