为什么PHP无法显示(内有httpd.conf文件)

安装了两天的apache+mysql+php+linux不管怎么弄就是无法解释PHP文件,上网也找了很多,也没能解决,静态的可以显示出来了,PHP就不行,提示让你下载,确实没办法了.也不知道错在那里,只号把httpd.conf也帖出来让大家看看,找了几处关键的,看能不能发现那里错了没有.
#
# Dynamic Shared Object (DSO) Support
#
# To be able to use the functionality of a module which was built as a DSO you
# have to place corresponding `LoadModule' lines at this location so the
# directives contained in it are actually available _before_ they are used.
# Please read the file http://httpd.apache.org/docs/dso.html for more
# details about the DSO mechanism and run `httpd -l' for the list of already
# built-in (statically linked and thus always available) modules in your httpd
# binary.
#
# Note: The order in which modules are loaded is important.  Don't change
# the order below without expert advice.
#
# Example:
# LoadModule foo_module libexec/mod_foo.so
LoadModule php4_module        libexec/libphp4.so(这个是安装完以后就有的了)
# DirectoryIndex: Name of the file or files to use as a pre-written HTML
# directory index.  Separate multiple entries with spaces.
#
<IfModule mod_dir.c>
    DirectoryIndex index.html index.php（index.php是加上去的）

# If the AddEncoding directives above are commented-out, then you
    # probably should define those extensions to indicate media types:
    #
    AddType application/x-compress .Z
    AddType application/x-gzip .gz .tgz
    AddType applocaltion/x-httpd-php .php .php3（这个也是加上去的）

今早有来找资料看看了，从网上找到了这样一些：运行 php -i. 如果有任何问题,详细的错误信息就显示出来了，它会告诉你下一步该做什么。 如果你得到满屏的HTML代码 (phpinfo() 函数的输出)， 那么PHP工作正常。
我照着运行了php -i出来了满屏的HTML代码；照理说就是我的配置的问题，但我也照着教材装了好几次了，问题到底在那里呢？