Stands for:
PHP: Hypertext Preprocessor
([DKF]: but originally allegedly stood for Personal Home Page.)

PHP is a [scripting] language mainly designed for [web] development, where it is quite popular--arguably
the single most widely-used server-side language.

This [http://www.php.net] is PHP's home page.

For [Tcl]'s answer to PHP, see [Rivet].

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In the last few years, 
"PHP [[has become]] Handy off the Web, Too",
although this article 
[http://click.unixreview.email-publisher.com/maaapDjaaSx7xa2scaRb/]
doesn't recommend it for those who already
know Tcl and similar languages.
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In a remarkable newsgroup posting 
[http://groups.google.com/groups?selm=vvujr6r1av3hc5%40corp.supernews.com],
[Derk Gwen] provides a recipe for the [C] implementation required to link in a Tcl
library so PHP source can also interpret Tcl.
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[PHP under Tclhttpd]
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See a Tk binding for PHP at [http://php-tk.sourceforge.net/]
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Incidentally, our own [SS] maintains an attractive "web-based interactive shell for PHP"
he and his collaborator call "PHP Interactive"
[http://www.hping.org/phpinteractive/].
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[Category Internet] | [Category Language] | [Category Acronym]