If we have default php installation in RHEL 4u6, and we need to reinstall with php5 with oracle client supported.  Uninstall  all PHP4 rpm rpm -qa | grep  php rpm -e  php-* Install  PHP5 rpm rpm -ivh  php-common-5*.rpm rpm -ivh  php-cli-5*.rpm rpm -ivh  php-5*.rpm rpm -ivh  sqlite-3*.rpm rpm -ivh  sqlite2-*.rpm rpm -ivh  php-pdo-5*.rpm rpm -ivh  php-oci8-5*.rpm Install  InstantClient mkdir -p  /opt/oracle/instantclient cd  /opt/oracle/instantclient unzip  instantclient-basic-linux32-10.2.0.3-xxx.zip unzip  instantclient-sdk-linux32-10.2.0.3-xxx.zip echo  /opt/oracle/instantclient/instantclient_10_2 >>  /etc/ld.so.conf ldconfig cd  /opt/oracle/instantclient/instantclient_10_2 ln -s libclntsh.so.10.1  libclntsh.so ln -s libocci.so.10.1  libocci.so ln -s libclntsh.so.10.1  libclntsh.so.11.1 Install  oci8 cd  /usr/local/src tar xzf  oci8-x.x.x.tgz cd  oci8-x.x.x phpize ./configure  --with-oci8=shared,instantclient,/opt/oracle/instantclient/instantclient_10_2 make make  install Restar...