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.

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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[lv] Would someone consider detailing some of the conceptual differences between
PHP and [Tcl]?  What kinds of things will a PHP programmer find confusing or
at least different, when learning Tcl?

PHPers want to put in lots of $-s, and have less regard for associative arrays than
they ought.  They often have trouble with Tcl's simplicity.

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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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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]