There are 3 versions of PHP available, PHP5-cli is for running programs on the command line, you can use this to create ncurses programs and even daemons.
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PHP is much newer than Perl so it has not seen as much use by system administrators, it is not pre-installed on Ubuntu but you can easily add it using the Synaptic Package Manager to Install PHP5. It has full support for Perl Regular Expressions as well as Object programming. PHP is a powerful and flexible language, it is used extensively to run high performance web sites such as Facebook and Yahoo, however it is also great for writing system admin scripts too. PHP is the language that put the "P" in LAMP, which is the technology that runs most of the internet (Linux, Apache, mySQL, PHP). Perl has a large number of extensions written for it visit to find them.
Visit the Perl website for more information. Perl is already installed on your Ubuntu system by default. Most languages now include regular expressions but Perl is particularly powerful when processing a lot of text. One of Perl's main features is regular expressions. Perl is very popular with web programmers and system administrators. They are called scripting languages because they are interpreted instead of compiled to machine language like C/C++ for example. Scripting languages are usually easy to learn and use. You can easily program in C/C++, java, fortran, python, perl, php, ruby, tcl, lisp.
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