Why PHP cannot be displayed (there is an httpd. conf file in it)

Why PHP cannot be displayed (there is an httpd. conf file in it)-Linux Enterprise Application-Linux server application information. The following is a detailed description. After two days of installation of apache + mysql + php + linux, no matter how you get it, you can't explain the php file, and you can find a lot on the Internet, but you can't solve it. static files can be displayed, PHP won't work. It prompts you to download the file, but it does not work. I do not know where the error is. I only need to call httpd. conf has also been posted to show you the key points to see if there are any errors.
#
# 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
# 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 mechanic 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 (this is available after installation)
# DirectoryIndex: Name of the file or files to use as a pre-written HTML
# Directory index. Separate multiple entries with spaces.
#

DirectoryIndex index.html index. php (index. php is added)

# If the AddEncoding directives abve are commented-out, then you
# Probably shoshould 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 (this is also included)