What is Apr,apr-util,iconv

The mission of the Apache Portable Runtime (APR) project is to create and maintain software libraries that provide a Predi CTable and consistent interface to underlying PLATFORM-SPECIFIC implementations. The primary goal is to provide a API to which software developers may code and being assured of predictable if not identical Behaviour regardless of the platform on which their software are built, relieving them of the need to code Special-case CO Nditions to work around or take advantage of platform-specific deficiencies or features.

APR (Apache portable run-time libraries,apache Portable Runtime ) , it provides an underlying support interface library that can be used across multiple operating system platforms, primarily for upper-level applications. In earlier versions of Apache, the application itself must be able to handle the details of a variety of specific operating system platforms and invoke different processing functions for different platforms.

Why is it necessary to install the APR when installing Apache?

In earlier versions of Apache, the application itself must be able to handle the details of a variety of specific operating system platforms and invoke different processing functions for different platforms. With the further development of Apache, the Apache organization decided to separate and develop these universal functions into a new project. In this way, the development of APR is isolated from Apache, and Apache uses only Apr.

In general, the APR development package can easily be understood as just a development package, but it is not. Currently, the full APR actually contains three development packages: Apr, Apr-util, and Apr-iconv, each developed independently and with its own version.

The APR contains a number of common development components, including MMAP,DSO, etc.
Apr-util This directory also contains some common development components. These components are more closely related to Apache than they are in the APR directory. such as buckets and bucket groups, encryption, and so on.
The files in the Apr-iconv package are primarily used to implement ICONV encoding. Most of the current encoding conversion processes are related to local coding. The local encoding must be set correctly before the conversion. So if two non-native encodings A and B need to be converted, the conversion process is roughly a->local and local->b or b->local and local->a.

What is Apr,apr-util,iconv