在Red Hat 5.6之后的版本下升级php版本
在Red Hat 5.6之后的版本上升级php版本
Red Hat企业版在5.6的时候发布了php的5.3.x版本，所以升级php版本的时候简单多了
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操作很简单，移除之前的版本，使用命令行比较简单点儿，#yum remove php
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然后安装5.3版本(是个独立的包，所以不能直接用yum升级)， #yum install php53 ? ?。这其中可能还有一些冲突的旧包，系统会提示，你用yum remove 包名就可以了。
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这样升级的好处是，如果你有购买redhat服务的话，redhat会继续提供服务，不然很可能他们不提供服务给你的服务器
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这种升级的方法同样适合Centos 5.6及以上版本
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