phpinfo（）未在浏览器中显示正确的版本

I am faceing a problem. The problem is : I have installed php 5.1 on my redhat linux server. then call phpinfo() in my browser. that shows php version 5.1, But after that I have install php 5.4 then calling again phpinfo() but still it shows php version 5.1 but it should be 5.4. any suggestion warmly acceptableI am faceing a problem. The problem is : I have