PHP Mode for Emacs Code

(php-class-key): Use c-lang-const to retrieve value
for c-symbol-key.
(php-mode): Add underscore (_) to syntax table for
font-lock-defaults.
(php-font-lock-keywords-1, php-font-lock-keywords-2)
(php-font-lock-keywords-3): Change references to \\s_ in regular
expressions to just using \\sw. Remove usage of "[^_$]?" and
"[^_]?" regular expression.

Fix various typos and documentation
string errors. Make in-line comment style consistent.

Fix indentation levels.

Convert tabs to spaces. Add form feed characters between sections.

Removed items in the ChangeLog section. A
ChangeLog file is now included with the source package.
(php-default-face, font-lock-keyword-face)
(font-lock-constant-face): Remove conditional bindings and XEmacs
code that likely does nothing.

(php-imenu-generic-expression): Reverse order of
expression, since Imenu displays it in reverse.
(php-completion-table): Move next to php-complete-function.

Update modification date and add David House to contributor list.

(php-font-lock-keywords-1)
(php-font-lock-keywords-2): Fix regular expression for
highlighting various keywords when they're at the beginning or end
of the line.

Fix typos and fill long paragraphs. Add
maintainer comment near top of file. Correct maintainer email
address with working address.
(Introduction): Add index entry for M-x php-mode-version.
(Installation): New section.
(Editing): Change concept index entry of fill-column to a variable
index entry.
(Completion): Add index entry for M-x visit-tags-table, and M-x
customize-variable.
(Index Menu): Finish maintainer comments on Imenu. "Functions"
sub-menu is now named "All Functions". Document new sub-menus
"Public methods", "Private methods", "Protected methods". Add
index entry for M-x customize-variable.
(Customization): Add index entry for M-x customize-group.
(Embedded HTML): Add index entry for M-x html-mode and M-x
html-mode.
(Contributors): Add Dias Badekas.
(Concept Index): Add maintainer notes on indexing.

(php-imenu-generic-expression)
(php-beginning-of-defun-regexp): Fix regular expression that is
failing to match identifiers in function definitions for Imenu and
add-change-log commands.
(php-keywords): Remove "private" since its handled like
"protected" and "public", not as a generic keyword.
(php-font-lock-keywords-1): The use of grouping in the regular
expression for php-constants and php-keywords added on 2008-04-12
requires referencing the group number to highlight, otherwrise the
entire match is highlighted.