Red Hat Enterprise Linux 5.4 release with  Linux kernel 2.6.18-164.It will support 10 Gigabit Ethernet . The custom kernel features tracepoints that can be used with the systemtap utility, per process I/O accounting and FIEMAP (the extent mapping ioctl call) support.
HighLights :

GCC 4.4
a new malloc() function,
filesystem support …

upgrading php in ferdora here are the steps
First you need check whether you have installed PHP or not.
run below command
$ rpm -qa |grep php
above command is sucess then run
$ yum update php
or
if you want to install php then run below command
$yum install php

Fedora 11 released
new features
edora also has added security features to its virtualization technology including S-Vert, which is essentially Security-Enhanced (SE) Linux containment for virtual guests. The technology helps fine-tune administration over each VM. Fedora also has improved Virtualization Manager’s secure authentication through support of Simple Authentication and Security Layer (SASL).

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